./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-memsafety/cstrchr-alloca-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version e7bb482b Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5088c66-0d95-4da2-b4a4-e9e5a1616f70/bin/utaipan-verify-FOvIYxoinp/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5088c66-0d95-4da2-b4a4-e9e5a1616f70/bin/utaipan-verify-FOvIYxoinp/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5088c66-0d95-4da2-b4a4-e9e5a1616f70/bin/utaipan-verify-FOvIYxoinp/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5088c66-0d95-4da2-b4a4-e9e5a1616f70/bin/utaipan-verify-FOvIYxoinp/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/cstrchr-alloca-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5088c66-0d95-4da2-b4a4-e9e5a1616f70/bin/utaipan-verify-FOvIYxoinp/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5088c66-0d95-4da2-b4a4-e9e5a1616f70/bin/utaipan-verify-FOvIYxoinp --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 71679b2a85162a2bf4315b62ab1893b5cfd06e20fc9e264973bd31bc9d08e300 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-e7bb482 [2023-11-06 21:01:50,584 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-06 21:01:50,708 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5088c66-0d95-4da2-b4a4-e9e5a1616f70/bin/utaipan-verify-FOvIYxoinp/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2023-11-06 21:01:50,720 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-06 21:01:50,721 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-06 21:01:50,759 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-06 21:01:50,760 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-06 21:01:50,761 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-06 21:01:50,762 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-06 21:01:50,767 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-06 21:01:50,767 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-06 21:01:50,769 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-06 21:01:50,769 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-06 21:01:50,771 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-06 21:01:50,772 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-06 21:01:50,772 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-06 21:01:50,772 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-06 21:01:50,773 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-06 21:01:50,773 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-06 21:01:50,774 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-06 21:01:50,774 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-06 21:01:50,775 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-06 21:01:50,776 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-06 21:01:50,776 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-06 21:01:50,777 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-06 21:01:50,778 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-06 21:01:50,778 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-06 21:01:50,779 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-06 21:01:50,779 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-06 21:01:50,780 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-11-06 21:01:50,781 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2023-11-06 21:01:50,782 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-11-06 21:01:50,782 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-06 21:01:50,782 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-11-06 21:01:50,782 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-11-06 21:01:50,783 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-06 21:01:50,783 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-06 21:01:50,783 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-06 21:01:50,784 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-06 21:01:50,784 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-06 21:01:50,784 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-06 21:01:50,785 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-06 21:01:50,785 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-06 21:01:50,785 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-06 21:01:50,786 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-06 21:01:50,786 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-06 21:01:50,787 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_f5088c66-0d95-4da2-b4a4-e9e5a1616f70/bin/utaipan-verify-FOvIYxoinp/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5088c66-0d95-4da2-b4a4-e9e5a1616f70/bin/utaipan-verify-FOvIYxoinp Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 71679b2a85162a2bf4315b62ab1893b5cfd06e20fc9e264973bd31bc9d08e300 [2023-11-06 21:01:51,085 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-06 21:01:51,127 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-06 21:01:51,131 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-06 21:01:51,132 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-06 21:01:51,133 INFO L274 PluginConnector]: CDTParser initialized [2023-11-06 21:01:51,134 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5088c66-0d95-4da2-b4a4-e9e5a1616f70/bin/utaipan-verify-FOvIYxoinp/../../sv-benchmarks/c/array-memsafety/cstrchr-alloca-2.i [2023-11-06 21:01:54,191 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-06 21:01:54,497 INFO L384 CDTParser]: Found 1 translation units. [2023-11-06 21:01:54,504 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5088c66-0d95-4da2-b4a4-e9e5a1616f70/sv-benchmarks/c/array-memsafety/cstrchr-alloca-2.i [2023-11-06 21:01:54,523 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5088c66-0d95-4da2-b4a4-e9e5a1616f70/bin/utaipan-verify-FOvIYxoinp/data/94c8220e8/ffe19f1124994c1dbef236f1beb65840/FLAGcaf3dfe76 [2023-11-06 21:01:54,537 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5088c66-0d95-4da2-b4a4-e9e5a1616f70/bin/utaipan-verify-FOvIYxoinp/data/94c8220e8/ffe19f1124994c1dbef236f1beb65840 [2023-11-06 21:01:54,540 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-06 21:01:54,542 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-06 21:01:54,543 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-06 21:01:54,543 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-06 21:01:54,549 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-06 21:01:54,550 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 09:01:54" (1/1) ... [2023-11-06 21:01:54,551 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@687d85c4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:01:54, skipping insertion in model container [2023-11-06 21:01:54,551 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 09:01:54" (1/1) ... [2023-11-06 21:01:54,600 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-06 21:01:54,980 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-06 21:01:54,994 INFO L202 MainTranslator]: Completed pre-run [2023-11-06 21:01:55,054 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-06 21:01:55,092 INFO L206 MainTranslator]: Completed translation [2023-11-06 21:01:55,093 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:01:55 WrapperNode [2023-11-06 21:01:55,093 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-06 21:01:55,095 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-06 21:01:55,095 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-06 21:01:55,095 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-06 21:01:55,103 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:01:55" (1/1) ... [2023-11-06 21:01:55,129 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:01:55" (1/1) ... [2023-11-06 21:01:55,161 INFO L138 Inliner]: procedures = 117, calls = 11, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 61 [2023-11-06 21:01:55,161 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-06 21:01:55,162 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-06 21:01:55,162 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-06 21:01:55,162 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-06 21:01:55,173 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:01:55" (1/1) ... [2023-11-06 21:01:55,174 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:01:55" (1/1) ... [2023-11-06 21:01:55,194 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:01:55" (1/1) ... [2023-11-06 21:01:55,195 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:01:55" (1/1) ... [2023-11-06 21:01:55,200 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:01:55" (1/1) ... [2023-11-06 21:01:55,204 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:01:55" (1/1) ... [2023-11-06 21:01:55,206 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:01:55" (1/1) ... [2023-11-06 21:01:55,207 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:01:55" (1/1) ... [2023-11-06 21:01:55,210 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-06 21:01:55,211 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-06 21:01:55,211 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-06 21:01:55,211 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-06 21:01:55,212 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:01:55" (1/1) ... [2023-11-06 21:01:55,224 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-06 21:01:55,239 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5088c66-0d95-4da2-b4a4-e9e5a1616f70/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 21:01:55,251 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5088c66-0d95-4da2-b4a4-e9e5a1616f70/bin/utaipan-verify-FOvIYxoinp/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-06 21:01:55,262 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5088c66-0d95-4da2-b4a4-e9e5a1616f70/bin/utaipan-verify-FOvIYxoinp/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-06 21:01:55,290 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-06 21:01:55,291 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-06 21:01:55,291 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-06 21:01:55,291 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-06 21:01:55,292 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-06 21:01:55,292 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-06 21:01:55,405 INFO L236 CfgBuilder]: Building ICFG [2023-11-06 21:01:55,408 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-06 21:01:55,612 INFO L277 CfgBuilder]: Performing block encoding [2023-11-06 21:01:55,686 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-06 21:01:55,690 INFO L302 CfgBuilder]: Removed 2 assume(true) statements. [2023-11-06 21:01:55,693 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 09:01:55 BoogieIcfgContainer [2023-11-06 21:01:55,702 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-06 21:01:55,705 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-06 21:01:55,705 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-06 21:01:55,709 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-06 21:01:55,709 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 09:01:54" (1/3) ... [2023-11-06 21:01:55,710 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3b58bb5d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 09:01:55, skipping insertion in model container [2023-11-06 21:01:55,710 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:01:55" (2/3) ... [2023-11-06 21:01:55,710 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3b58bb5d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 09:01:55, skipping insertion in model container [2023-11-06 21:01:55,711 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 09:01:55" (3/3) ... [2023-11-06 21:01:55,712 INFO L112 eAbstractionObserver]: Analyzing ICFG cstrchr-alloca-2.i [2023-11-06 21:01:55,752 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-06 21:01:55,752 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 11 error locations. [2023-11-06 21:01:55,815 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-06 21:01:55,823 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;@3980ca43, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-06 21:01:55,823 INFO L358 AbstractCegarLoop]: Starting to check reachability of 11 error locations. [2023-11-06 21:01:55,828 INFO L276 IsEmpty]: Start isEmpty. Operand has 22 states, 10 states have (on average 2.5) internal successors, (25), 21 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:01:55,834 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2023-11-06 21:01:55,834 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:01:55,835 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2023-11-06 21:01:55,836 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 8 more)] === [2023-11-06 21:01:55,842 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:01:55,842 INFO L85 PathProgramCache]: Analyzing trace with hash 106256, now seen corresponding path program 1 times [2023-11-06 21:01:55,853 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:01:55,853 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [352263686] [2023-11-06 21:01:55,854 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:01:55,854 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:01:55,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:01:56,137 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:01:56,141 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:01:56,142 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [352263686] [2023-11-06 21:01:56,142 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [352263686] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 21:01:56,143 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 21:01:56,143 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-11-06 21:01:56,145 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1363543449] [2023-11-06 21:01:56,146 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 21:01:56,151 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-06 21:01:56,152 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:01:56,200 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-06 21:01:56,201 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-06 21:01:56,203 INFO L87 Difference]: Start difference. First operand has 22 states, 10 states have (on average 2.5) internal successors, (25), 21 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) 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) [2023-11-06 21:01:56,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:01:56,277 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2023-11-06 21:01:56,278 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-06 21:01:56,280 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 [2023-11-06 21:01:56,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:01:56,289 INFO L225 Difference]: With dead ends: 20 [2023-11-06 21:01:56,290 INFO L226 Difference]: Without dead ends: 19 [2023-11-06 21:01:56,292 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 [2023-11-06 21:01:56,296 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 17 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 21:01:56,298 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 9 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 21:01:56,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2023-11-06 21:01:56,330 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2023-11-06 21:01:56,331 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 10 states have (on average 2.1) internal successors, (21), 18 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:01:56,332 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2023-11-06 21:01:56,334 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 3 [2023-11-06 21:01:56,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:01:56,334 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2023-11-06 21:01:56,335 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) [2023-11-06 21:01:56,336 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2023-11-06 21:01:56,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2023-11-06 21:01:56,337 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:01:56,337 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2023-11-06 21:01:56,338 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-06 21:01:56,339 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 8 more)] === [2023-11-06 21:01:56,340 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:01:56,340 INFO L85 PathProgramCache]: Analyzing trace with hash 106257, now seen corresponding path program 1 times [2023-11-06 21:01:56,340 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:01:56,341 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [494624658] [2023-11-06 21:01:56,341 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:01:56,341 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:01:56,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:01:56,839 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:01:56,840 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:01:56,841 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [494624658] [2023-11-06 21:01:56,842 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [494624658] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 21:01:56,842 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 21:01:56,842 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-06 21:01:56,843 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [160538799] [2023-11-06 21:01:56,843 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 21:01:56,844 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-06 21:01:56,845 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:01:56,846 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-06 21:01:56,847 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-06 21:01:56,852 INFO L87 Difference]: Start difference. First operand 19 states and 21 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) [2023-11-06 21:01:56,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:01:56,967 INFO L93 Difference]: Finished difference Result 21 states and 24 transitions. [2023-11-06 21:01:56,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-06 21:01:56,968 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 [2023-11-06 21:01:56,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:01:56,969 INFO L225 Difference]: With dead ends: 21 [2023-11-06 21:01:56,969 INFO L226 Difference]: Without dead ends: 21 [2023-11-06 21:01:56,969 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-11-06 21:01:56,971 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 1 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 21:01:56,972 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 29 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 21:01:56,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2023-11-06 21:01:56,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2023-11-06 21:01:56,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 12 states have (on average 2.0) internal successors, (24), 20 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:01:56,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 24 transitions. [2023-11-06 21:01:56,977 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 24 transitions. Word has length 3 [2023-11-06 21:01:56,977 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:01:56,977 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 24 transitions. [2023-11-06 21:01:56,978 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) [2023-11-06 21:01:56,978 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 24 transitions. [2023-11-06 21:01:56,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2023-11-06 21:01:56,978 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:01:56,979 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2023-11-06 21:01:56,979 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-06 21:01:56,979 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 8 more)] === [2023-11-06 21:01:56,980 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:01:56,980 INFO L85 PathProgramCache]: Analyzing trace with hash 108251, now seen corresponding path program 1 times [2023-11-06 21:01:56,980 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:01:56,981 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1588870830] [2023-11-06 21:01:56,981 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:01:56,981 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:01:56,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:01:57,230 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:01:57,231 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:01:57,231 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1588870830] [2023-11-06 21:01:57,231 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1588870830] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 21:01:57,231 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 21:01:57,232 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-06 21:01:57,232 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1205105500] [2023-11-06 21:01:57,232 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 21:01:57,232 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-06 21:01:57,233 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:01:57,233 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-06 21:01:57,233 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-06 21:01:57,234 INFO L87 Difference]: Start difference. First operand 21 states and 24 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) [2023-11-06 21:01:57,292 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:01:57,292 INFO L93 Difference]: Finished difference Result 20 states and 23 transitions. [2023-11-06 21:01:57,293 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-06 21:01:57,293 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 [2023-11-06 21:01:57,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:01:57,294 INFO L225 Difference]: With dead ends: 20 [2023-11-06 21:01:57,294 INFO L226 Difference]: Without dead ends: 20 [2023-11-06 21:01:57,294 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 [2023-11-06 21:01:57,296 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 36 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 21:01:57,297 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [36 Valid, 8 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 21:01:57,298 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2023-11-06 21:01:57,300 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2023-11-06 21:01:57,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 19 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:01:57,301 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 23 transitions. [2023-11-06 21:01:57,301 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 23 transitions. Word has length 3 [2023-11-06 21:01:57,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:01:57,302 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 23 transitions. [2023-11-06 21:01:57,302 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) [2023-11-06 21:01:57,302 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 23 transitions. [2023-11-06 21:01:57,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2023-11-06 21:01:57,302 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:01:57,303 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2023-11-06 21:01:57,303 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-06 21:01:57,303 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 8 more)] === [2023-11-06 21:01:57,304 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:01:57,304 INFO L85 PathProgramCache]: Analyzing trace with hash 3356996, now seen corresponding path program 1 times [2023-11-06 21:01:57,304 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:01:57,304 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1849681002] [2023-11-06 21:01:57,304 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:01:57,305 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:01:57,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:01:57,367 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:01:57,367 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:01:57,367 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1849681002] [2023-11-06 21:01:57,368 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1849681002] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 21:01:57,368 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 21:01:57,368 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-06 21:01:57,368 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [53523443] [2023-11-06 21:01:57,368 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 21:01:57,369 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-06 21:01:57,369 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:01:57,369 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-06 21:01:57,370 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-06 21:01:57,370 INFO L87 Difference]: Start difference. First operand 20 states and 23 transitions. Second operand has 3 states, 2 states have (on average 2.0) 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) [2023-11-06 21:01:57,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:01:57,396 INFO L93 Difference]: Finished difference Result 17 states and 20 transitions. [2023-11-06 21:01:57,396 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-06 21:01:57,396 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) 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 [2023-11-06 21:01:57,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:01:57,397 INFO L225 Difference]: With dead ends: 17 [2023-11-06 21:01:57,397 INFO L226 Difference]: Without dead ends: 17 [2023-11-06 21:01:57,397 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-06 21:01:57,399 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 8 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-06 21:01:57,399 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 8 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-06 21:01:57,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2023-11-06 21:01:57,402 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2023-11-06 21:01:57,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 16 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:01:57,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 20 transitions. [2023-11-06 21:01:57,403 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 20 transitions. Word has length 4 [2023-11-06 21:01:57,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:01:57,403 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 20 transitions. [2023-11-06 21:01:57,404 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) 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) [2023-11-06 21:01:57,404 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 20 transitions. [2023-11-06 21:01:57,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2023-11-06 21:01:57,404 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:01:57,404 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2023-11-06 21:01:57,405 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-06 21:01:57,405 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 8 more)] === [2023-11-06 21:01:57,405 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:01:57,405 INFO L85 PathProgramCache]: Analyzing trace with hash 3356997, now seen corresponding path program 1 times [2023-11-06 21:01:57,406 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:01:57,406 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [903224324] [2023-11-06 21:01:57,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:01:57,406 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:01:57,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:01:57,473 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:01:57,473 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:01:57,473 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [903224324] [2023-11-06 21:01:57,474 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [903224324] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 21:01:57,474 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 21:01:57,474 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-06 21:01:57,474 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [49250508] [2023-11-06 21:01:57,474 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 21:01:57,475 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-06 21:01:57,475 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:01:57,475 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-06 21:01:57,475 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-06 21:01:57,476 INFO L87 Difference]: Start difference. First operand 17 states and 20 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) [2023-11-06 21:01:57,520 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:01:57,520 INFO L93 Difference]: Finished difference Result 22 states and 27 transitions. [2023-11-06 21:01:57,521 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-06 21:01:57,521 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 [2023-11-06 21:01:57,521 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:01:57,522 INFO L225 Difference]: With dead ends: 22 [2023-11-06 21:01:57,522 INFO L226 Difference]: Without dead ends: 22 [2023-11-06 21:01:57,522 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 [2023-11-06 21:01:57,524 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 27 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-06 21:01:57,524 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 13 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-06 21:01:57,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2023-11-06 21:01:57,527 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2023-11-06 21:01:57,527 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.588235294117647) internal successors, (27), 21 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:01:57,528 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 27 transitions. [2023-11-06 21:01:57,528 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 27 transitions. Word has length 4 [2023-11-06 21:01:57,528 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:01:57,528 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 27 transitions. [2023-11-06 21:01:57,528 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) [2023-11-06 21:01:57,529 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 27 transitions. [2023-11-06 21:01:57,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2023-11-06 21:01:57,529 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:01:57,529 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1] [2023-11-06 21:01:57,529 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-11-06 21:01:57,530 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 8 more)] === [2023-11-06 21:01:57,530 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:01:57,530 INFO L85 PathProgramCache]: Analyzing trace with hash 102163496, now seen corresponding path program 1 times [2023-11-06 21:01:57,530 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:01:57,531 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1364720399] [2023-11-06 21:01:57,531 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:01:57,531 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:01:57,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:01:57,755 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:01:57,755 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:01:57,756 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1364720399] [2023-11-06 21:01:57,756 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1364720399] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 21:01:57,756 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [39420243] [2023-11-06 21:01:57,756 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:01:57,757 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:01:57,757 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5088c66-0d95-4da2-b4a4-e9e5a1616f70/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 21:01:57,762 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5088c66-0d95-4da2-b4a4-e9e5a1616f70/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 21:01:57,788 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5088c66-0d95-4da2-b4a4-e9e5a1616f70/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-06 21:01:57,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:01:57,833 INFO L262 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 16 conjunts are in the unsatisfiable core [2023-11-06 21:01:57,838 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 21:01:57,946 INFO L351 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 7 [2023-11-06 21:01:58,191 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:01:58,191 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 21:01:58,346 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:01:58,347 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [39420243] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 21:01:58,347 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1679393750] [2023-11-06 21:01:58,366 INFO L159 IcfgInterpreter]: Started Sifa with 4 locations of interest [2023-11-06 21:01:58,367 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 21:01:58,371 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 21:01:58,376 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 21:01:58,377 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 21:01:58,777 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 21:01:58,929 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '281#(and (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_#t~nondet10#1| 127) (<= 2 |ULTIMATE.start_main_~nondetString~0#1.base|) (<= (select |#length| |ULTIMATE.start_main_~nondetString~0#1.base|) |ULTIMATE.start_main_~i~0#1|) (<= (+ 2 |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_~length~0#1|) (= |ULTIMATE.start_main_~nondetString~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ 128 |ULTIMATE.start_main_#t~nondet10#1|)))' at error location [2023-11-06 21:01:58,929 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 21:01:58,929 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 21:01:58,929 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 9 [2023-11-06 21:01:58,930 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2078737179] [2023-11-06 21:01:58,930 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 21:01:58,930 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-11-06 21:01:58,930 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:01:58,931 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-11-06 21:01:58,931 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2023-11-06 21:01:58,932 INFO L87 Difference]: Start difference. First operand 22 states and 27 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) [2023-11-06 21:01:59,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:01:59,138 INFO L93 Difference]: Finished difference Result 22 states and 28 transitions. [2023-11-06 21:01:59,139 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-06 21:01:59,139 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 [2023-11-06 21:01:59,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:01:59,140 INFO L225 Difference]: With dead ends: 22 [2023-11-06 21:01:59,140 INFO L226 Difference]: Without dead ends: 22 [2023-11-06 21:01:59,140 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=71, Invalid=201, Unknown=0, NotChecked=0, Total=272 [2023-11-06 21:01:59,141 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 2 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 88 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 90 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 88 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 21:01:59,142 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 38 Invalid, 90 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 88 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 21:01:59,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2023-11-06 21:01:59,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 19. [2023-11-06 21:01:59,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 18 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:01:59,145 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 23 transitions. [2023-11-06 21:01:59,145 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 23 transitions. Word has length 5 [2023-11-06 21:01:59,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:01:59,146 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 23 transitions. [2023-11-06 21:01:59,146 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) [2023-11-06 21:01:59,146 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 23 transitions. [2023-11-06 21:01:59,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-11-06 21:01:59,146 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:01:59,147 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-11-06 21:01:59,158 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5088c66-0d95-4da2-b4a4-e9e5a1616f70/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-06 21:01:59,347 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5088c66-0d95-4da2-b4a4-e9e5a1616f70/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-11-06 21:01:59,347 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 8 more)] === [2023-11-06 21:01:59,348 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:01:59,348 INFO L85 PathProgramCache]: Analyzing trace with hash 1225021180, now seen corresponding path program 1 times [2023-11-06 21:01:59,348 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:01:59,348 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1508357792] [2023-11-06 21:01:59,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:01:59,348 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:01:59,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:01:59,374 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:01:59,374 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:01:59,375 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1508357792] [2023-11-06 21:01:59,375 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1508357792] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 21:01:59,375 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 21:01:59,375 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-06 21:01:59,375 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [768606081] [2023-11-06 21:01:59,375 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 21:01:59,376 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-06 21:01:59,376 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:01:59,376 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-06 21:01:59,377 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-06 21:01:59,377 INFO L87 Difference]: Start difference. First operand 19 states and 23 transitions. Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:01:59,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:01:59,400 INFO L93 Difference]: Finished difference Result 21 states and 25 transitions. [2023-11-06 21:01:59,401 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-06 21:01:59,401 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2023-11-06 21:01:59,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:01:59,403 INFO L225 Difference]: With dead ends: 21 [2023-11-06 21:01:59,404 INFO L226 Difference]: Without dead ends: 21 [2023-11-06 21:01:59,404 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 [2023-11-06 21:01:59,405 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 0 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-06 21:01:59,405 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 13 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-06 21:01:59,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2023-11-06 21:01:59,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2023-11-06 21:01:59,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 20 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:01:59,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2023-11-06 21:01:59,414 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 7 [2023-11-06 21:01:59,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:01:59,414 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2023-11-06 21:01:59,414 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:01:59,414 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2023-11-06 21:01:59,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-06 21:01:59,415 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:01:59,415 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 21:01:59,415 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-11-06 21:01:59,416 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr10ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 8 more)] === [2023-11-06 21:01:59,416 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:01:59,416 INFO L85 PathProgramCache]: Analyzing trace with hash -679049794, now seen corresponding path program 1 times [2023-11-06 21:01:59,416 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:01:59,417 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1409742959] [2023-11-06 21:01:59,417 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:01:59,417 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:01:59,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:01:59,515 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:01:59,515 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:01:59,516 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1409742959] [2023-11-06 21:01:59,516 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1409742959] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 21:01:59,516 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 21:01:59,516 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-06 21:01:59,516 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1380997934] [2023-11-06 21:01:59,516 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 21:01:59,517 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-06 21:01:59,517 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:01:59,518 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-06 21:01:59,518 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-06 21:01:59,518 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:01:59,539 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:01:59,539 INFO L93 Difference]: Finished difference Result 20 states and 24 transitions. [2023-11-06 21:01:59,540 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-06 21:01:59,540 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2023-11-06 21:01:59,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:01:59,541 INFO L225 Difference]: With dead ends: 20 [2023-11-06 21:01:59,541 INFO L226 Difference]: Without dead ends: 17 [2023-11-06 21:01:59,541 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 [2023-11-06 21:01:59,544 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 8 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-06 21:01:59,545 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 16 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-06 21:01:59,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2023-11-06 21:01:59,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2023-11-06 21:01:59,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 16 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:01:59,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2023-11-06 21:01:59,550 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 8 [2023-11-06 21:01:59,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:01:59,550 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2023-11-06 21:01:59,550 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:01:59,550 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2023-11-06 21:01:59,551 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-06 21:01:59,551 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:01:59,552 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 21:01:59,553 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-11-06 21:01:59,553 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 8 more)] === [2023-11-06 21:01:59,554 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:01:59,554 INFO L85 PathProgramCache]: Analyzing trace with hash -679211920, now seen corresponding path program 1 times [2023-11-06 21:01:59,554 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:01:59,554 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1569954622] [2023-11-06 21:01:59,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:01:59,555 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:01:59,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:01:59,744 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:01:59,744 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:01:59,744 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1569954622] [2023-11-06 21:01:59,744 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1569954622] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 21:01:59,744 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 21:01:59,745 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-06 21:01:59,745 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2001878012] [2023-11-06 21:01:59,745 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 21:01:59,745 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-06 21:01:59,745 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:01:59,746 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-06 21:01:59,746 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-06 21:01:59,746 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 5 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:01:59,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:01:59,821 INFO L93 Difference]: Finished difference Result 22 states and 24 transitions. [2023-11-06 21:01:59,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-06 21:01:59,822 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 5 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2023-11-06 21:01:59,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:01:59,823 INFO L225 Difference]: With dead ends: 22 [2023-11-06 21:01:59,823 INFO L226 Difference]: Without dead ends: 19 [2023-11-06 21:01:59,823 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2023-11-06 21:01:59,824 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 5 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-06 21:01:59,824 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 23 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-06 21:01:59,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2023-11-06 21:01:59,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 18. [2023-11-06 21:01:59,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 17 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:01:59,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2023-11-06 21:01:59,827 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 8 [2023-11-06 21:01:59,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:01:59,827 INFO L495 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2023-11-06 21:01:59,827 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 5 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:01:59,827 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2023-11-06 21:01:59,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-11-06 21:01:59,828 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:01:59,828 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 21:01:59,828 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-11-06 21:01:59,828 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 8 more)] === [2023-11-06 21:01:59,829 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:01:59,829 INFO L85 PathProgramCache]: Analyzing trace with hash 1009868217, now seen corresponding path program 1 times [2023-11-06 21:01:59,829 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:01:59,829 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [728996354] [2023-11-06 21:01:59,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:01:59,829 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:01:59,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:02:00,033 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:02:00,033 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:02:00,033 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [728996354] [2023-11-06 21:02:00,033 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [728996354] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 21:02:00,034 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1145972538] [2023-11-06 21:02:00,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:02:00,034 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:02:00,034 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5088c66-0d95-4da2-b4a4-e9e5a1616f70/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 21:02:00,036 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5088c66-0d95-4da2-b4a4-e9e5a1616f70/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 21:02:00,067 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5088c66-0d95-4da2-b4a4-e9e5a1616f70/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-06 21:02:00,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:02:00,126 INFO L262 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 18 conjunts are in the unsatisfiable core [2023-11-06 21:02:00,129 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 21:02:00,137 INFO L351 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 [2023-11-06 21:02:00,219 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:02:00,219 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 21:02:00,356 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:02:00,357 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1145972538] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 21:02:00,357 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [263499758] [2023-11-06 21:02:00,360 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-06 21:02:00,360 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 21:02:00,360 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 21:02:00,361 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 21:02:00,361 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 21:02:01,438 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 21:02:02,188 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '537#(and (<= (select |#length| |ULTIMATE.start_cstrchr_~s#1.base|) |ULTIMATE.start_cstrchr_~s#1.offset|) (<= 0 |ULTIMATE.start_cstrchr_#in~s#1.offset|) (<= |ULTIMATE.start_cstrchr_~c#1| 2147483647) (<= 1 |ULTIMATE.start_cstrchr_~s#1.offset|) (<= 0 (+ |ULTIMATE.start_cstrchr_#in~c#1| 2147483648)) (<= |ULTIMATE.start_main_#t~nondet11#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString~0#1.offset|) (<= 0 (+ |ULTIMATE.start_cstrchr_~c#1| 2147483648)) (<= 0 (+ 2147483648 |ULTIMATE.start_main_#t~nondet11#1|)) (<= |ULTIMATE.start_cstrchr_#in~c#1| 2147483647))' at error location [2023-11-06 21:02:02,188 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 21:02:02,189 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 21:02:02,189 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 14 [2023-11-06 21:02:02,189 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1362111348] [2023-11-06 21:02:02,189 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 21:02:02,190 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-11-06 21:02:02,190 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:02:02,190 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-11-06 21:02:02,191 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=424, Unknown=0, NotChecked=0, Total=506 [2023-11-06 21:02:02,191 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand has 16 states, 15 states have (on average 1.9333333333333333) internal successors, (29), 15 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:02:02,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:02:02,361 INFO L93 Difference]: Finished difference Result 23 states and 26 transitions. [2023-11-06 21:02:02,361 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-06 21:02:02,362 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 1.9333333333333333) internal successors, (29), 15 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2023-11-06 21:02:02,362 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:02:02,362 INFO L225 Difference]: With dead ends: 23 [2023-11-06 21:02:02,362 INFO L226 Difference]: Without dead ends: 19 [2023-11-06 21:02:02,363 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 192 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=117, Invalid=585, Unknown=0, NotChecked=0, Total=702 [2023-11-06 21:02:02,364 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 53 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 21:02:02,364 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [53 Valid, 20 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 21:02:02,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2023-11-06 21:02:02,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 15. [2023-11-06 21:02:02,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 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) [2023-11-06 21:02:02,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2023-11-06 21:02:02,367 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 10 [2023-11-06 21:02:02,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:02:02,368 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2023-11-06 21:02:02,368 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 1.9333333333333333) internal successors, (29), 15 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:02:02,369 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2023-11-06 21:02:02,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-11-06 21:02:02,369 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:02:02,370 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2023-11-06 21:02:02,380 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5088c66-0d95-4da2-b4a4-e9e5a1616f70/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-06 21:02:02,576 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5088c66-0d95-4da2-b4a4-e9e5a1616f70/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:02:02,577 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 8 more)] === [2023-11-06 21:02:02,578 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:02:02,578 INFO L85 PathProgramCache]: Analyzing trace with hash -432875804, now seen corresponding path program 2 times [2023-11-06 21:02:02,578 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:02:02,578 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1981155128] [2023-11-06 21:02:02,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:02:02,579 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:02:02,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:02:03,005 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:02:03,005 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:02:03,006 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1981155128] [2023-11-06 21:02:03,006 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1981155128] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 21:02:03,006 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1396245493] [2023-11-06 21:02:03,006 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-06 21:02:03,006 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:02:03,007 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5088c66-0d95-4da2-b4a4-e9e5a1616f70/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 21:02:03,008 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5088c66-0d95-4da2-b4a4-e9e5a1616f70/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 21:02:03,032 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5088c66-0d95-4da2-b4a4-e9e5a1616f70/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-06 21:02:03,097 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-06 21:02:03,097 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-06 21:02:03,099 INFO L262 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 29 conjunts are in the unsatisfiable core [2023-11-06 21:02:03,103 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 21:02:03,173 INFO L351 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 [2023-11-06 21:02:03,234 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:02:03,234 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 21:02:03,269 INFO L351 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 [2023-11-06 21:02:03,273 INFO L351 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 [2023-11-06 21:02:03,331 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:02:03,331 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1396245493] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 21:02:03,331 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1905240651] [2023-11-06 21:02:03,335 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-06 21:02:03,336 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 21:02:03,336 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 21:02:03,336 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 21:02:03,337 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 21:02:04,165 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 21:02:04,897 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '687#(and (<= (select |#length| |ULTIMATE.start_cstrchr_~s#1.base|) |ULTIMATE.start_cstrchr_~s#1.offset|) (<= 0 |ULTIMATE.start_cstrchr_#in~s#1.offset|) (<= |ULTIMATE.start_cstrchr_~c#1| 2147483647) (<= 1 |ULTIMATE.start_cstrchr_~s#1.offset|) (<= 0 (+ |ULTIMATE.start_cstrchr_#in~c#1| 2147483648)) (<= |ULTIMATE.start_main_#t~nondet11#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString~0#1.offset|) (<= 0 (+ |ULTIMATE.start_cstrchr_~c#1| 2147483648)) (<= 0 (+ 2147483648 |ULTIMATE.start_main_#t~nondet11#1|)) (<= |ULTIMATE.start_cstrchr_#in~c#1| 2147483647))' at error location [2023-11-06 21:02:04,898 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 21:02:04,898 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 21:02:04,898 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 18 [2023-11-06 21:02:04,898 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1323833817] [2023-11-06 21:02:04,898 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 21:02:04,899 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2023-11-06 21:02:04,899 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:02:04,899 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2023-11-06 21:02:04,900 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=569, Unknown=0, NotChecked=0, Total=650 [2023-11-06 21:02:04,900 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand has 19 states, 19 states have (on average 1.5789473684210527) internal successors, (30), 18 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:02:05,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:02:05,116 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2023-11-06 21:02:05,117 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-06 21:02:05,117 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.5789473684210527) internal successors, (30), 18 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2023-11-06 21:02:05,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:02:05,117 INFO L225 Difference]: With dead ends: 25 [2023-11-06 21:02:05,117 INFO L226 Difference]: Without dead ends: 18 [2023-11-06 21:02:05,118 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 211 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=139, Invalid=853, Unknown=0, NotChecked=0, Total=992 [2023-11-06 21:02:05,119 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 21 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 99 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 100 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 99 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 21:02:05,119 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [21 Valid, 25 Invalid, 100 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 99 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 21:02:05,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2023-11-06 21:02:05,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2023-11-06 21:02:05,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.125) internal successors, (18), 16 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) [2023-11-06 21:02:05,121 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2023-11-06 21:02:05,121 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 14 [2023-11-06 21:02:05,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:02:05,122 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2023-11-06 21:02:05,122 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.5789473684210527) internal successors, (30), 18 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:02:05,122 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2023-11-06 21:02:05,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-11-06 21:02:05,123 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:02:05,123 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1] [2023-11-06 21:02:05,132 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5088c66-0d95-4da2-b4a4-e9e5a1616f70/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-06 21:02:05,323 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5088c66-0d95-4da2-b4a4-e9e5a1616f70/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2023-11-06 21:02:05,324 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 8 more)] === [2023-11-06 21:02:05,324 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:02:05,324 INFO L85 PathProgramCache]: Analyzing trace with hash 1132875117, now seen corresponding path program 3 times [2023-11-06 21:02:05,324 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:02:05,324 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [476554628] [2023-11-06 21:02:05,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:02:05,325 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:02:05,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:02:05,684 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:02:05,684 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:02:05,684 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [476554628] [2023-11-06 21:02:05,684 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [476554628] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 21:02:05,684 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [535129496] [2023-11-06 21:02:05,685 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-06 21:02:05,685 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:02:05,685 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5088c66-0d95-4da2-b4a4-e9e5a1616f70/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 21:02:05,686 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5088c66-0d95-4da2-b4a4-e9e5a1616f70/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 21:02:05,708 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5088c66-0d95-4da2-b4a4-e9e5a1616f70/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-06 21:02:05,765 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-06 21:02:05,765 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-06 21:02:05,767 INFO L262 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 23 conjunts are in the unsatisfiable core [2023-11-06 21:02:05,769 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 21:02:05,775 INFO L351 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 [2023-11-06 21:02:05,899 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 1 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:02:05,899 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 21:02:06,131 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 1 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:02:06,132 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [535129496] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 21:02:06,133 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [80356841] [2023-11-06 21:02:06,135 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-06 21:02:06,136 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 21:02:06,136 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 21:02:06,136 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 21:02:06,137 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 21:02:06,849 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 21:02:07,639 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '858#(and (<= (select |#length| |ULTIMATE.start_cstrchr_~s#1.base|) |ULTIMATE.start_cstrchr_~s#1.offset|) (<= 0 |ULTIMATE.start_cstrchr_#in~s#1.offset|) (<= |ULTIMATE.start_cstrchr_~c#1| 2147483647) (<= 1 |ULTIMATE.start_cstrchr_~s#1.offset|) (<= 0 (+ |ULTIMATE.start_cstrchr_#in~c#1| 2147483648)) (<= |ULTIMATE.start_main_#t~nondet11#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString~0#1.offset|) (<= 0 (+ |ULTIMATE.start_cstrchr_~c#1| 2147483648)) (<= 0 (+ 2147483648 |ULTIMATE.start_main_#t~nondet11#1|)) (<= |ULTIMATE.start_cstrchr_#in~c#1| 2147483647))' at error location [2023-11-06 21:02:07,639 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 21:02:07,639 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 21:02:07,639 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7, 7] total 18 [2023-11-06 21:02:07,639 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1467224408] [2023-11-06 21:02:07,640 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 21:02:07,640 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-11-06 21:02:07,640 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:02:07,641 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-11-06 21:02:07,641 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=609, Unknown=0, NotChecked=0, Total=702 [2023-11-06 21:02:07,641 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand has 20 states, 19 states have (on average 2.263157894736842) internal successors, (43), 19 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) [2023-11-06 21:02:07,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:02:07,957 INFO L93 Difference]: Finished difference Result 24 states and 25 transitions. [2023-11-06 21:02:07,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-06 21:02:07,958 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 2.263157894736842) internal successors, (43), 19 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2023-11-06 21:02:07,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:02:07,959 INFO L225 Difference]: With dead ends: 24 [2023-11-06 21:02:07,959 INFO L226 Difference]: Without dead ends: 24 [2023-11-06 21:02:07,960 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 229 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=139, Invalid=853, Unknown=0, NotChecked=0, Total=992 [2023-11-06 21:02:07,960 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 62 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 174 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 62 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 176 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 174 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 21:02:07,961 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [62 Valid, 25 Invalid, 176 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 174 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 21:02:07,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2023-11-06 21:02:07,963 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 21. [2023-11-06 21:02:07,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 20 states have (on average 1.1) internal successors, (22), 20 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:02:07,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2023-11-06 21:02:07,963 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 16 [2023-11-06 21:02:07,967 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:02:07,967 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2023-11-06 21:02:07,967 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 2.263157894736842) internal successors, (43), 19 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) [2023-11-06 21:02:07,967 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2023-11-06 21:02:07,968 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-11-06 21:02:07,969 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:02:07,969 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 1, 1, 1, 1] [2023-11-06 21:02:07,979 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5088c66-0d95-4da2-b4a4-e9e5a1616f70/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-06 21:02:08,169 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5088c66-0d95-4da2-b4a4-e9e5a1616f70/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2023-11-06 21:02:08,170 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 8 more)] === [2023-11-06 21:02:08,170 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:02:08,170 INFO L85 PathProgramCache]: Analyzing trace with hash 1432407192, now seen corresponding path program 4 times [2023-11-06 21:02:08,170 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:02:08,170 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1301556008] [2023-11-06 21:02:08,171 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:02:08,171 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:02:08,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:02:08,628 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 7 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:02:08,629 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:02:08,629 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1301556008] [2023-11-06 21:02:08,629 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1301556008] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 21:02:08,629 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1964440541] [2023-11-06 21:02:08,630 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-06 21:02:08,630 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:02:08,630 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5088c66-0d95-4da2-b4a4-e9e5a1616f70/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 21:02:08,631 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5088c66-0d95-4da2-b4a4-e9e5a1616f70/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 21:02:08,635 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5088c66-0d95-4da2-b4a4-e9e5a1616f70/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-06 21:02:08,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:02:08,731 INFO L262 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 33 conjunts are in the unsatisfiable core [2023-11-06 21:02:08,734 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 21:02:08,828 INFO L351 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 [2023-11-06 21:02:08,870 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 7 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:02:08,871 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 21:02:08,900 INFO L351 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 [2023-11-06 21:02:08,903 INFO L351 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 [2023-11-06 21:02:08,971 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 7 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:02:08,971 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1964440541] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 21:02:08,971 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [435900142] [2023-11-06 21:02:08,974 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-06 21:02:08,975 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 21:02:08,975 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 21:02:08,975 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 21:02:08,975 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 21:02:09,641 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 21:02:10,391 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1053#(and (<= (select |#length| |ULTIMATE.start_cstrchr_~s#1.base|) |ULTIMATE.start_cstrchr_~s#1.offset|) (<= 0 |ULTIMATE.start_cstrchr_#in~s#1.offset|) (<= |ULTIMATE.start_cstrchr_~c#1| 2147483647) (<= 1 |ULTIMATE.start_cstrchr_~s#1.offset|) (<= 0 (+ |ULTIMATE.start_cstrchr_#in~c#1| 2147483648)) (<= |ULTIMATE.start_main_#t~nondet11#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString~0#1.offset|) (<= 0 (+ |ULTIMATE.start_cstrchr_~c#1| 2147483648)) (<= 0 (+ 2147483648 |ULTIMATE.start_main_#t~nondet11#1|)) (<= |ULTIMATE.start_cstrchr_#in~c#1| 2147483647))' at error location [2023-11-06 21:02:10,391 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 21:02:10,391 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 21:02:10,391 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 18 [2023-11-06 21:02:10,391 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [922198891] [2023-11-06 21:02:10,391 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 21:02:10,392 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2023-11-06 21:02:10,392 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:02:10,392 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2023-11-06 21:02:10,393 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=573, Unknown=0, NotChecked=0, Total=650 [2023-11-06 21:02:10,393 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand has 19 states, 19 states have (on average 1.7894736842105263) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:02:10,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:02:10,630 INFO L93 Difference]: Finished difference Result 35 states and 36 transitions. [2023-11-06 21:02:10,630 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-11-06 21:02:10,630 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.7894736842105263) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2023-11-06 21:02:10,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:02:10,631 INFO L225 Difference]: With dead ends: 35 [2023-11-06 21:02:10,631 INFO L226 Difference]: Without dead ends: 24 [2023-11-06 21:02:10,632 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 145 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=123, Invalid=869, Unknown=0, NotChecked=0, Total=992 [2023-11-06 21:02:10,632 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 15 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 149 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 151 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 149 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 21:02:10,633 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 26 Invalid, 151 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 149 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 21:02:10,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2023-11-06 21:02:10,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2023-11-06 21:02:10,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 22 states have (on average 1.0909090909090908) internal successors, (24), 22 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:02:10,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2023-11-06 21:02:10,635 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 20 [2023-11-06 21:02:10,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:02:10,635 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2023-11-06 21:02:10,635 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.7894736842105263) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:02:10,636 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2023-11-06 21:02:10,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-11-06 21:02:10,636 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:02:10,636 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 1, 1, 1, 1] [2023-11-06 21:02:10,644 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5088c66-0d95-4da2-b4a4-e9e5a1616f70/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-06 21:02:10,837 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5088c66-0d95-4da2-b4a4-e9e5a1616f70/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-11-06 21:02:10,837 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 8 more)] === [2023-11-06 21:02:10,837 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:02:10,837 INFO L85 PathProgramCache]: Analyzing trace with hash -1762035615, now seen corresponding path program 5 times [2023-11-06 21:02:10,838 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:02:10,838 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [64126218] [2023-11-06 21:02:10,838 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:02:10,838 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:02:10,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:02:11,225 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 1 proven. 23 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:02:11,226 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:02:11,226 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [64126218] [2023-11-06 21:02:11,226 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [64126218] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 21:02:11,226 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1431083234] [2023-11-06 21:02:11,226 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-06 21:02:11,226 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:02:11,227 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5088c66-0d95-4da2-b4a4-e9e5a1616f70/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 21:02:11,228 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5088c66-0d95-4da2-b4a4-e9e5a1616f70/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 21:02:11,254 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5088c66-0d95-4da2-b4a4-e9e5a1616f70/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-06 21:02:11,319 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-11-06 21:02:11,319 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-06 21:02:11,321 INFO L262 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 26 conjunts are in the unsatisfiable core [2023-11-06 21:02:11,323 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 21:02:11,329 INFO L351 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 [2023-11-06 21:02:11,505 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 4 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:02:11,505 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 21:02:11,807 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 4 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:02:11,807 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1431083234] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 21:02:11,807 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1777582171] [2023-11-06 21:02:11,810 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-06 21:02:11,810 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 21:02:11,810 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 21:02:11,810 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 21:02:11,810 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 21:02:12,421 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 21:02:13,115 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1284#(and (<= (select |#length| |ULTIMATE.start_cstrchr_~s#1.base|) |ULTIMATE.start_cstrchr_~s#1.offset|) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cstrchr_~c#1| 2147483647) (<= 1 |ULTIMATE.start_cstrchr_~s#1.offset|) (= |ULTIMATE.start_main_~nondetString~0#1.offset| 0) (<= 0 (+ |ULTIMATE.start_cstrchr_#in~c#1| 2147483648)) (= |ULTIMATE.start_cstrchr_#in~s#1.offset| 0) (<= |ULTIMATE.start_main_#t~nondet11#1| 2147483647) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= 0 (+ |ULTIMATE.start_cstrchr_~c#1| 2147483648)) (<= 0 (+ 2147483648 |ULTIMATE.start_main_#t~nondet11#1|)) (<= |ULTIMATE.start_cstrchr_#in~c#1| 2147483647))' at error location [2023-11-06 21:02:13,116 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 21:02:13,116 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 21:02:13,116 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 9] total 26 [2023-11-06 21:02:13,116 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2115687266] [2023-11-06 21:02:13,116 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 21:02:13,118 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2023-11-06 21:02:13,119 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:02:13,119 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2023-11-06 21:02:13,120 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=150, Invalid=1040, Unknown=0, NotChecked=0, Total=1190 [2023-11-06 21:02:13,120 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand has 28 states, 27 states have (on average 2.4444444444444446) internal successors, (66), 27 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:02:13,375 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:02:13,376 INFO L93 Difference]: Finished difference Result 30 states and 31 transitions. [2023-11-06 21:02:13,376 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-11-06 21:02:13,376 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 2.4444444444444446) internal successors, (66), 27 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2023-11-06 21:02:13,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:02:13,377 INFO L225 Difference]: With dead ends: 30 [2023-11-06 21:02:13,377 INFO L226 Difference]: Without dead ends: 30 [2023-11-06 21:02:13,378 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 461 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=222, Invalid=1418, Unknown=0, NotChecked=0, Total=1640 [2023-11-06 21:02:13,379 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 53 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 151 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 152 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 151 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 21:02:13,379 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [53 Valid, 29 Invalid, 152 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 151 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 21:02:13,379 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2023-11-06 21:02:13,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 27. [2023-11-06 21:02:13,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.0769230769230769) internal successors, (28), 26 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:02:13,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2023-11-06 21:02:13,382 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 22 [2023-11-06 21:02:13,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:02:13,382 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2023-11-06 21:02:13,382 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 27 states have (on average 2.4444444444444446) internal successors, (66), 27 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:02:13,382 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2023-11-06 21:02:13,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-11-06 21:02:13,383 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:02:13,383 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 1, 1, 1, 1] [2023-11-06 21:02:13,396 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5088c66-0d95-4da2-b4a4-e9e5a1616f70/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-06 21:02:13,584 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5088c66-0d95-4da2-b4a4-e9e5a1616f70/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2023-11-06 21:02:13,585 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 8 more)] === [2023-11-06 21:02:13,585 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:02:13,585 INFO L85 PathProgramCache]: Analyzing trace with hash 345857420, now seen corresponding path program 6 times [2023-11-06 21:02:13,585 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:02:13,585 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [300186606] [2023-11-06 21:02:13,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:02:13,586 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:02:13,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:02:14,068 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 10 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:02:14,068 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:02:14,069 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [300186606] [2023-11-06 21:02:14,069 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [300186606] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 21:02:14,069 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [425600879] [2023-11-06 21:02:14,069 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-06 21:02:14,069 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:02:14,069 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5088c66-0d95-4da2-b4a4-e9e5a1616f70/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 21:02:14,072 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5088c66-0d95-4da2-b4a4-e9e5a1616f70/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 21:02:14,096 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5088c66-0d95-4da2-b4a4-e9e5a1616f70/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-06 21:02:14,177 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-06 21:02:14,178 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-06 21:02:14,179 INFO L262 TraceCheckSpWp]: Trace formula consists of 170 conjuncts, 39 conjunts are in the unsatisfiable core [2023-11-06 21:02:14,182 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 21:02:14,291 INFO L351 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 [2023-11-06 21:02:14,343 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 10 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:02:14,343 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 21:02:14,375 INFO L351 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 [2023-11-06 21:02:14,377 INFO L351 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 [2023-11-06 21:02:14,442 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 10 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:02:14,442 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [425600879] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 21:02:14,442 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1066761671] [2023-11-06 21:02:14,444 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-06 21:02:14,445 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 21:02:14,445 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 21:02:14,445 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 21:02:14,445 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 21:02:15,106 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 21:02:15,840 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1532#(and (<= (select |#length| |ULTIMATE.start_cstrchr_~s#1.base|) |ULTIMATE.start_cstrchr_~s#1.offset|) (<= 0 |ULTIMATE.start_cstrchr_#in~s#1.offset|) (<= |ULTIMATE.start_cstrchr_~c#1| 2147483647) (<= 1 |ULTIMATE.start_cstrchr_~s#1.offset|) (<= 0 (+ |ULTIMATE.start_cstrchr_#in~c#1| 2147483648)) (<= |ULTIMATE.start_main_#t~nondet11#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString~0#1.offset|) (<= 0 (+ |ULTIMATE.start_cstrchr_~c#1| 2147483648)) (<= 0 (+ 2147483648 |ULTIMATE.start_main_#t~nondet11#1|)) (<= |ULTIMATE.start_cstrchr_#in~c#1| 2147483647))' at error location [2023-11-06 21:02:15,841 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 21:02:15,841 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 21:02:15,841 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 21 [2023-11-06 21:02:15,841 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1001451543] [2023-11-06 21:02:15,841 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 21:02:15,842 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2023-11-06 21:02:15,842 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:02:15,843 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2023-11-06 21:02:15,843 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=728, Unknown=0, NotChecked=0, Total=812 [2023-11-06 21:02:15,844 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand has 22 states, 22 states have (on average 1.9090909090909092) internal successors, (42), 21 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) [2023-11-06 21:02:16,198 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:02:16,199 INFO L93 Difference]: Finished difference Result 45 states and 46 transitions. [2023-11-06 21:02:16,199 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-11-06 21:02:16,199 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.9090909090909092) internal successors, (42), 21 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 26 [2023-11-06 21:02:16,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:02:16,200 INFO L225 Difference]: With dead ends: 45 [2023-11-06 21:02:16,200 INFO L226 Difference]: Without dead ends: 30 [2023-11-06 21:02:16,201 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 181 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=142, Invalid=1190, Unknown=0, NotChecked=0, Total=1332 [2023-11-06 21:02:16,202 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 32 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 258 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 261 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 258 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-06 21:02:16,202 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [32 Valid, 43 Invalid, 261 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 258 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-06 21:02:16,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2023-11-06 21:02:16,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2023-11-06 21:02:16,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.0714285714285714) internal successors, (30), 28 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:02:16,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2023-11-06 21:02:16,205 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 26 [2023-11-06 21:02:16,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:02:16,206 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2023-11-06 21:02:16,206 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.9090909090909092) internal successors, (42), 21 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) [2023-11-06 21:02:16,206 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2023-11-06 21:02:16,207 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-11-06 21:02:16,207 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:02:16,207 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 1, 1, 1, 1] [2023-11-06 21:02:16,221 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5088c66-0d95-4da2-b4a4-e9e5a1616f70/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-06 21:02:16,413 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5088c66-0d95-4da2-b4a4-e9e5a1616f70/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2023-11-06 21:02:16,413 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 8 more)] === [2023-11-06 21:02:16,413 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:02:16,414 INFO L85 PathProgramCache]: Analyzing trace with hash 378424981, now seen corresponding path program 7 times [2023-11-06 21:02:16,414 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:02:16,414 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [427381048] [2023-11-06 21:02:16,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:02:16,414 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:02:16,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:02:16,946 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:02:16,946 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:02:16,946 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [427381048] [2023-11-06 21:02:16,946 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [427381048] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 21:02:16,947 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2085309883] [2023-11-06 21:02:16,947 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-06 21:02:16,947 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:02:16,947 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5088c66-0d95-4da2-b4a4-e9e5a1616f70/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 21:02:16,948 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5088c66-0d95-4da2-b4a4-e9e5a1616f70/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 21:02:16,975 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5088c66-0d95-4da2-b4a4-e9e5a1616f70/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-06 21:02:17,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:02:17,050 INFO L262 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 33 conjunts are in the unsatisfiable core [2023-11-06 21:02:17,052 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 21:02:17,058 INFO L351 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 [2023-11-06 21:02:17,274 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 9 proven. 35 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:02:17,274 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 21:02:17,783 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 9 proven. 35 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:02:17,784 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2085309883] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 21:02:17,784 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1238249540] [2023-11-06 21:02:17,786 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-06 21:02:17,786 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 21:02:17,786 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 21:02:17,787 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 21:02:17,787 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 21:02:18,354 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 21:02:19,063 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1821#(and (<= (select |#length| |ULTIMATE.start_cstrchr_~s#1.base|) |ULTIMATE.start_cstrchr_~s#1.offset|) (<= 0 |ULTIMATE.start_cstrchr_#in~s#1.offset|) (<= |ULTIMATE.start_cstrchr_~c#1| 2147483647) (<= 1 |ULTIMATE.start_cstrchr_~s#1.offset|) (<= 0 (+ |ULTIMATE.start_cstrchr_#in~c#1| 2147483648)) (<= |ULTIMATE.start_main_#t~nondet11#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString~0#1.offset|) (<= 0 (+ |ULTIMATE.start_cstrchr_~c#1| 2147483648)) (<= 0 (+ 2147483648 |ULTIMATE.start_main_#t~nondet11#1|)) (<= |ULTIMATE.start_cstrchr_#in~c#1| 2147483647))' at error location [2023-11-06 21:02:19,063 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 21:02:19,063 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 21:02:19,063 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11, 11] total 28 [2023-11-06 21:02:19,063 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1447595078] [2023-11-06 21:02:19,064 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 21:02:19,064 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2023-11-06 21:02:19,064 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:02:19,065 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2023-11-06 21:02:19,066 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=1174, Unknown=0, NotChecked=0, Total=1332 [2023-11-06 21:02:19,066 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand has 30 states, 29 states have (on average 2.4482758620689653) internal successors, (71), 29 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) [2023-11-06 21:02:19,500 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:02:19,501 INFO L93 Difference]: Finished difference Result 36 states and 37 transitions. [2023-11-06 21:02:19,503 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-11-06 21:02:19,503 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 29 states have (on average 2.4482758620689653) internal successors, (71), 29 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 28 [2023-11-06 21:02:19,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:02:19,504 INFO L225 Difference]: With dead ends: 36 [2023-11-06 21:02:19,504 INFO L226 Difference]: Without dead ends: 36 [2023-11-06 21:02:19,505 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 518 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=233, Invalid=1659, Unknown=0, NotChecked=0, Total=1892 [2023-11-06 21:02:19,507 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 59 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 270 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 271 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 270 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-06 21:02:19,508 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [59 Valid, 44 Invalid, 271 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 270 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-06 21:02:19,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2023-11-06 21:02:19,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 33. [2023-11-06 21:02:19,511 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 32 states have (on average 1.0625) internal successors, (34), 32 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 21:02:19,511 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2023-11-06 21:02:19,512 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 28 [2023-11-06 21:02:19,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:02:19,512 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2023-11-06 21:02:19,512 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 29 states have (on average 2.4482758620689653) internal successors, (71), 29 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) [2023-11-06 21:02:19,512 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2023-11-06 21:02:19,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2023-11-06 21:02:19,513 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:02:19,514 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 1, 1, 1, 1] [2023-11-06 21:02:19,528 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5088c66-0d95-4da2-b4a4-e9e5a1616f70/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-06 21:02:19,721 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5088c66-0d95-4da2-b4a4-e9e5a1616f70/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2023-11-06 21:02:19,721 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 8 more)] === [2023-11-06 21:02:19,721 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:02:19,721 INFO L85 PathProgramCache]: Analyzing trace with hash 1957951936, now seen corresponding path program 8 times [2023-11-06 21:02:19,722 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:02:19,722 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1896997046] [2023-11-06 21:02:19,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:02:19,722 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:02:19,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:02:20,256 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 13 proven. 48 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:02:20,257 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:02:20,257 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1896997046] [2023-11-06 21:02:20,257 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1896997046] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 21:02:20,257 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1548120598] [2023-11-06 21:02:20,257 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-06 21:02:20,257 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:02:20,257 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5088c66-0d95-4da2-b4a4-e9e5a1616f70/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 21:02:20,258 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5088c66-0d95-4da2-b4a4-e9e5a1616f70/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 21:02:20,273 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f5088c66-0d95-4da2-b4a4-e9e5a1616f70/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-06 21:02:20,383 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2023-11-06 21:02:20,383 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-06 21:02:20,385 INFO L262 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 41 conjunts are in the unsatisfiable core [2023-11-06 21:02:20,388 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 21:02:20,395 INFO L351 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