./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 9bd2c7ff 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_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/cstrchr-alloca-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 71679b2a85162a2bf4315b62ab1893b5cfd06e20fc9e264973bd31bc9d08e300 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-9bd2c7f [2023-11-19 05:00:27,601 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-19 05:00:27,722 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2023-11-19 05:00:27,730 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-19 05:00:27,731 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-19 05:00:27,764 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-19 05:00:27,765 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-19 05:00:27,765 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-19 05:00:27,766 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-19 05:00:27,766 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-19 05:00:27,767 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-19 05:00:27,768 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-19 05:00:27,768 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-19 05:00:27,773 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-19 05:00:27,774 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-19 05:00:27,775 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-19 05:00:27,776 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-19 05:00:27,776 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-19 05:00:27,777 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-19 05:00:27,777 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-19 05:00:27,778 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-19 05:00:27,779 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-19 05:00:27,779 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-19 05:00:27,780 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-19 05:00:27,781 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-19 05:00:27,782 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-19 05:00:27,782 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-19 05:00:27,782 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-19 05:00:27,783 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-19 05:00:27,783 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-11-19 05:00:27,785 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2023-11-19 05:00:27,785 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-11-19 05:00:27,786 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-19 05:00:27,786 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-11-19 05:00:27,786 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-11-19 05:00:27,786 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-19 05:00:27,787 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-19 05:00:27,787 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-19 05:00:27,787 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-19 05:00:27,788 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 05:00:27,788 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-19 05:00:27,789 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-19 05:00:27,789 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-19 05:00:27,789 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-19 05:00:27,790 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-19 05:00:27,790 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-19 05:00:27,790 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_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 71679b2a85162a2bf4315b62ab1893b5cfd06e20fc9e264973bd31bc9d08e300 [2023-11-19 05:00:28,151 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-19 05:00:28,190 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-19 05:00:28,192 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-19 05:00:28,194 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-19 05:00:28,195 INFO L274 PluginConnector]: CDTParser initialized [2023-11-19 05:00:28,197 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/../../sv-benchmarks/c/array-memsafety/cstrchr-alloca-2.i [2023-11-19 05:00:31,213 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-19 05:00:31,626 INFO L384 CDTParser]: Found 1 translation units. [2023-11-19 05:00:31,627 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/sv-benchmarks/c/array-memsafety/cstrchr-alloca-2.i [2023-11-19 05:00:31,645 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/data/f31e621bd/49a75a0cfe8847fe89d9a88fb54dcf8f/FLAG9ae2c47d6 [2023-11-19 05:00:31,665 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/data/f31e621bd/49a75a0cfe8847fe89d9a88fb54dcf8f [2023-11-19 05:00:31,673 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-19 05:00:31,676 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-19 05:00:31,680 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-19 05:00:31,680 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-19 05:00:31,686 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-19 05:00:31,687 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 05:00:31" (1/1) ... [2023-11-19 05:00:31,688 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4dd0289a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:00:31, skipping insertion in model container [2023-11-19 05:00:31,688 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 05:00:31" (1/1) ... [2023-11-19 05:00:31,752 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-19 05:00:32,069 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 05:00:32,085 INFO L202 MainTranslator]: Completed pre-run [2023-11-19 05:00:32,152 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 05:00:32,184 INFO L206 MainTranslator]: Completed translation [2023-11-19 05:00:32,185 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:00:32 WrapperNode [2023-11-19 05:00:32,185 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-19 05:00:32,187 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-19 05:00:32,187 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-19 05:00:32,187 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-19 05:00:32,195 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:00:32" (1/1) ... [2023-11-19 05:00:32,208 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:00:32" (1/1) ... [2023-11-19 05:00:32,239 INFO L138 Inliner]: procedures = 117, calls = 11, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 61 [2023-11-19 05:00:32,240 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-19 05:00:32,241 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-19 05:00:32,241 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-19 05:00:32,241 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-19 05:00:32,252 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:00:32" (1/1) ... [2023-11-19 05:00:32,253 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:00:32" (1/1) ... [2023-11-19 05:00:32,269 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:00:32" (1/1) ... [2023-11-19 05:00:32,270 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:00:32" (1/1) ... [2023-11-19 05:00:32,275 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:00:32" (1/1) ... [2023-11-19 05:00:32,285 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:00:32" (1/1) ... [2023-11-19 05:00:32,287 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:00:32" (1/1) ... [2023-11-19 05:00:32,288 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:00:32" (1/1) ... [2023-11-19 05:00:32,290 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-19 05:00:32,291 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-19 05:00:32,291 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-19 05:00:32,292 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-19 05:00:32,299 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:00:32" (1/1) ... [2023-11-19 05:00:32,306 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 05:00:32,319 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:00:32,333 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-19 05:00:32,373 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-19 05:00:32,387 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-19 05:00:32,387 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-19 05:00:32,387 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-19 05:00:32,388 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-19 05:00:32,388 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-19 05:00:32,388 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-19 05:00:32,534 INFO L236 CfgBuilder]: Building ICFG [2023-11-19 05:00:32,537 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-19 05:00:32,727 INFO L277 CfgBuilder]: Performing block encoding [2023-11-19 05:00:32,797 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-19 05:00:32,797 INFO L302 CfgBuilder]: Removed 2 assume(true) statements. [2023-11-19 05:00:32,802 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 05:00:32 BoogieIcfgContainer [2023-11-19 05:00:32,802 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-19 05:00:32,806 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-19 05:00:32,806 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-19 05:00:32,810 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-19 05:00:32,810 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 05:00:31" (1/3) ... [2023-11-19 05:00:32,811 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@750c3e0b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 05:00:32, skipping insertion in model container [2023-11-19 05:00:32,811 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:00:32" (2/3) ... [2023-11-19 05:00:32,812 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@750c3e0b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 05:00:32, skipping insertion in model container [2023-11-19 05:00:32,812 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 05:00:32" (3/3) ... [2023-11-19 05:00:32,813 INFO L112 eAbstractionObserver]: Analyzing ICFG cstrchr-alloca-2.i [2023-11-19 05:00:32,835 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-19 05:00:32,836 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 11 error locations. [2023-11-19 05:00:32,886 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-19 05:00:32,893 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;@13b4a8fd, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-19 05:00:32,893 INFO L358 AbstractCegarLoop]: Starting to check reachability of 11 error locations. [2023-11-19 05:00:32,898 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) [2023-11-19 05:00:32,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2023-11-19 05:00:32,905 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:00:32,905 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2023-11-19 05:00:32,906 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)] === [2023-11-19 05:00:32,912 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:00:32,913 INFO L85 PathProgramCache]: Analyzing trace with hash 106256, now seen corresponding path program 1 times [2023-11-19 05:00:32,922 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:00:32,923 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [196373373] [2023-11-19 05:00:32,923 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:00:32,924 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:00:33,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:00:33,191 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:00:33,191 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:00:33,192 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [196373373] [2023-11-19 05:00:33,192 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [196373373] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:00:33,193 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:00:33,193 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-11-19 05:00:33,195 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1312821407] [2023-11-19 05:00:33,196 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:00:33,200 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 05:00:33,201 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:00:33,234 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 05:00:33,235 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:00:33,237 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) [2023-11-19 05:00:33,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:00:33,321 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2023-11-19 05:00:33,323 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 05:00:33,324 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 [2023-11-19 05:00:33,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:00:33,333 INFO L225 Difference]: With dead ends: 20 [2023-11-19 05:00:33,334 INFO L226 Difference]: Without dead ends: 19 [2023-11-19 05:00:33,336 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 [2023-11-19 05:00:33,340 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 17 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s 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 [2023-11-19 05:00:33,343 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] [2023-11-19 05:00:33,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2023-11-19 05:00:33,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2023-11-19 05:00:33,377 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) [2023-11-19 05:00:33,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2023-11-19 05:00:33,380 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 3 [2023-11-19 05:00:33,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:00:33,381 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2023-11-19 05:00:33,381 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) [2023-11-19 05:00:33,383 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2023-11-19 05:00:33,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2023-11-19 05:00:33,384 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:00:33,384 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2023-11-19 05:00:33,385 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-19 05:00:33,386 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)] === [2023-11-19 05:00:33,387 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:00:33,387 INFO L85 PathProgramCache]: Analyzing trace with hash 106257, now seen corresponding path program 1 times [2023-11-19 05:00:33,387 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:00:33,388 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [943140538] [2023-11-19 05:00:33,388 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:00:33,389 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:00:33,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:00:33,809 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:00:33,810 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:00:33,811 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [943140538] [2023-11-19 05:00:33,812 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [943140538] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:00:33,812 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:00:33,812 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-19 05:00:33,813 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1044602750] [2023-11-19 05:00:33,813 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:00:33,814 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-19 05:00:33,815 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:00:33,816 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-19 05:00:33,817 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-19 05:00:33,817 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) [2023-11-19 05:00:33,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:00:33,926 INFO L93 Difference]: Finished difference Result 21 states and 24 transitions. [2023-11-19 05:00:33,927 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-19 05:00:33,927 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 [2023-11-19 05:00:33,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:00:33,929 INFO L225 Difference]: With dead ends: 21 [2023-11-19 05:00:33,929 INFO L226 Difference]: Without dead ends: 21 [2023-11-19 05:00:33,935 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 [2023-11-19 05:00:33,937 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 [2023-11-19 05:00:33,938 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] [2023-11-19 05:00:33,946 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2023-11-19 05:00:33,952 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2023-11-19 05:00:33,952 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) [2023-11-19 05:00:33,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 24 transitions. [2023-11-19 05:00:33,954 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 24 transitions. Word has length 3 [2023-11-19 05:00:33,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:00:33,955 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 24 transitions. [2023-11-19 05:00:33,955 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) [2023-11-19 05:00:33,955 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 24 transitions. [2023-11-19 05:00:33,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2023-11-19 05:00:33,957 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:00:33,957 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2023-11-19 05:00:33,958 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-19 05:00:33,958 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)] === [2023-11-19 05:00:33,960 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:00:33,960 INFO L85 PathProgramCache]: Analyzing trace with hash 108251, now seen corresponding path program 1 times [2023-11-19 05:00:33,960 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:00:33,961 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [560204712] [2023-11-19 05:00:33,961 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:00:33,962 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:00:34,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:00:34,237 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:00:34,237 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:00:34,237 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [560204712] [2023-11-19 05:00:34,237 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [560204712] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:00:34,238 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:00:34,238 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-19 05:00:34,238 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1073012270] [2023-11-19 05:00:34,238 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:00:34,239 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-19 05:00:34,239 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:00:34,240 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-19 05:00:34,240 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-19 05:00:34,240 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) [2023-11-19 05:00:34,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:00:34,276 INFO L93 Difference]: Finished difference Result 20 states and 23 transitions. [2023-11-19 05:00:34,277 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 05:00:34,277 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 [2023-11-19 05:00:34,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:00:34,278 INFO L225 Difference]: With dead ends: 20 [2023-11-19 05:00:34,278 INFO L226 Difference]: Without dead ends: 20 [2023-11-19 05:00:34,279 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-19 05:00:34,285 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, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 05:00:34,286 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [36 Valid, 8 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 05:00:34,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2023-11-19 05:00:34,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2023-11-19 05:00:34,290 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) [2023-11-19 05:00:34,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 23 transitions. [2023-11-19 05:00:34,296 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 23 transitions. Word has length 3 [2023-11-19 05:00:34,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:00:34,296 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 23 transitions. [2023-11-19 05:00:34,297 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) [2023-11-19 05:00:34,297 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 23 transitions. [2023-11-19 05:00:34,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2023-11-19 05:00:34,297 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:00:34,297 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2023-11-19 05:00:34,298 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-19 05:00:34,298 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)] === [2023-11-19 05:00:34,299 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:00:34,299 INFO L85 PathProgramCache]: Analyzing trace with hash 3356996, now seen corresponding path program 1 times [2023-11-19 05:00:34,299 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:00:34,299 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1812861597] [2023-11-19 05:00:34,299 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:00:34,300 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:00:34,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:00:34,363 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:00:34,363 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:00:34,363 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1812861597] [2023-11-19 05:00:34,363 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1812861597] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:00:34,363 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:00:34,364 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-19 05:00:34,364 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1734928826] [2023-11-19 05:00:34,364 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:00:34,364 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 05:00:34,365 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:00:34,365 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 05:00:34,365 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:00:34,366 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) [2023-11-19 05:00:34,406 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:00:34,406 INFO L93 Difference]: Finished difference Result 17 states and 20 transitions. [2023-11-19 05:00:34,407 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 05:00:34,407 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 [2023-11-19 05:00:34,407 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:00:34,409 INFO L225 Difference]: With dead ends: 17 [2023-11-19 05:00:34,409 INFO L226 Difference]: Without dead ends: 17 [2023-11-19 05:00:34,409 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 [2023-11-19 05:00:34,415 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 [2023-11-19 05:00:34,416 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] [2023-11-19 05:00:34,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2023-11-19 05:00:34,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2023-11-19 05:00:34,420 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) [2023-11-19 05:00:34,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 20 transitions. [2023-11-19 05:00:34,421 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 20 transitions. Word has length 4 [2023-11-19 05:00:34,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:00:34,421 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 20 transitions. [2023-11-19 05:00:34,422 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) [2023-11-19 05:00:34,422 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 20 transitions. [2023-11-19 05:00:34,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2023-11-19 05:00:34,422 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:00:34,422 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2023-11-19 05:00:34,423 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-19 05:00:34,423 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)] === [2023-11-19 05:00:34,423 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:00:34,424 INFO L85 PathProgramCache]: Analyzing trace with hash 3356997, now seen corresponding path program 1 times [2023-11-19 05:00:34,424 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:00:34,424 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [793288170] [2023-11-19 05:00:34,424 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:00:34,424 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:00:34,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:00:34,562 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:00:34,563 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:00:34,563 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [793288170] [2023-11-19 05:00:34,563 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [793288170] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:00:34,563 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:00:34,563 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-19 05:00:34,564 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [747824423] [2023-11-19 05:00:34,564 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:00:34,564 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-19 05:00:34,565 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:00:34,565 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-19 05:00:34,565 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-19 05:00:34,566 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) [2023-11-19 05:00:34,609 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:00:34,609 INFO L93 Difference]: Finished difference Result 22 states and 27 transitions. [2023-11-19 05:00:34,609 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-19 05:00:34,610 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 [2023-11-19 05:00:34,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:00:34,611 INFO L225 Difference]: With dead ends: 22 [2023-11-19 05:00:34,611 INFO L226 Difference]: Without dead ends: 22 [2023-11-19 05:00:34,611 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 [2023-11-19 05:00:34,612 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 [2023-11-19 05:00:34,613 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] [2023-11-19 05:00:34,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2023-11-19 05:00:34,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2023-11-19 05:00:34,616 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) [2023-11-19 05:00:34,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 27 transitions. [2023-11-19 05:00:34,617 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 27 transitions. Word has length 4 [2023-11-19 05:00:34,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:00:34,618 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 27 transitions. [2023-11-19 05:00:34,618 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) [2023-11-19 05:00:34,619 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 27 transitions. [2023-11-19 05:00:34,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2023-11-19 05:00:34,619 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:00:34,619 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1] [2023-11-19 05:00:34,620 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-11-19 05:00:34,620 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)] === [2023-11-19 05:00:34,620 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:00:34,621 INFO L85 PathProgramCache]: Analyzing trace with hash 102163496, now seen corresponding path program 1 times [2023-11-19 05:00:34,621 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:00:34,621 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1485568480] [2023-11-19 05:00:34,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:00:34,622 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:00:34,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:00:34,860 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:00:34,860 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:00:34,861 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1485568480] [2023-11-19 05:00:34,861 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1485568480] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:00:34,861 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [438163212] [2023-11-19 05:00:34,861 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:00:34,862 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:00:34,862 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:00:34,864 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:00:34,895 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-19 05:00:34,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:00:34,940 INFO L262 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 15 conjunts are in the unsatisfiable core [2023-11-19 05:00:34,946 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:00:35,038 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-11-19 05:00:35,226 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:00:35,226 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:00:35,359 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:00:35,359 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [438163212] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:00:35,360 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1854896343] [2023-11-19 05:00:35,384 INFO L159 IcfgInterpreter]: Started Sifa with 4 locations of interest [2023-11-19 05:00:35,384 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:00:35,389 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:00:35,395 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:00:35,395 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:00:35,852 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:00:35,999 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 [2023-11-19 05:00:36,000 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:00:36,001 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:00:36,001 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 9 [2023-11-19 05:00:36,001 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1978345110] [2023-11-19 05:00:36,007 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:00:36,008 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-11-19 05:00:36,008 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:00:36,009 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-11-19 05:00:36,011 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=138, Unknown=0, NotChecked=0, Total=182 [2023-11-19 05:00:36,011 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) [2023-11-19 05:00:36,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:00:36,225 INFO L93 Difference]: Finished difference Result 22 states and 28 transitions. [2023-11-19 05:00:36,226 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-19 05:00:36,226 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 [2023-11-19 05:00:36,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:00:36,227 INFO L225 Difference]: With dead ends: 22 [2023-11-19 05:00:36,227 INFO L226 Difference]: Without dead ends: 22 [2023-11-19 05:00:36,228 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=70, Invalid=202, Unknown=0, NotChecked=0, Total=272 [2023-11-19 05:00:36,231 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 [2023-11-19 05:00:36,231 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] [2023-11-19 05:00:36,232 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2023-11-19 05:00:36,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 19. [2023-11-19 05:00:36,237 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) [2023-11-19 05:00:36,238 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 23 transitions. [2023-11-19 05:00:36,238 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 23 transitions. Word has length 5 [2023-11-19 05:00:36,239 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:00:36,239 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 23 transitions. [2023-11-19 05:00:36,239 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) [2023-11-19 05:00:36,239 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 23 transitions. [2023-11-19 05:00:36,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-11-19 05:00:36,241 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:00:36,241 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:00:36,268 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-19 05:00:36,463 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-11-19 05:00:36,463 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)] === [2023-11-19 05:00:36,464 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:00:36,464 INFO L85 PathProgramCache]: Analyzing trace with hash 1225021180, now seen corresponding path program 1 times [2023-11-19 05:00:36,464 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:00:36,464 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1762971727] [2023-11-19 05:00:36,464 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:00:36,464 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:00:36,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:00:36,489 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:00:36,490 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:00:36,490 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1762971727] [2023-11-19 05:00:36,490 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1762971727] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:00:36,490 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:00:36,490 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-19 05:00:36,491 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [707520215] [2023-11-19 05:00:36,491 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:00:36,491 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 05:00:36,491 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:00:36,492 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 05:00:36,493 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:00:36,493 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) [2023-11-19 05:00:36,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:00:36,518 INFO L93 Difference]: Finished difference Result 21 states and 25 transitions. [2023-11-19 05:00:36,519 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 05:00:36,519 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 [2023-11-19 05:00:36,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:00:36,522 INFO L225 Difference]: With dead ends: 21 [2023-11-19 05:00:36,522 INFO L226 Difference]: Without dead ends: 21 [2023-11-19 05:00:36,522 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 [2023-11-19 05:00:36,523 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 [2023-11-19 05:00:36,524 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] [2023-11-19 05:00:36,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2023-11-19 05:00:36,530 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2023-11-19 05:00:36,530 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) [2023-11-19 05:00:36,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2023-11-19 05:00:36,531 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 7 [2023-11-19 05:00:36,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:00:36,532 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2023-11-19 05:00:36,532 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) [2023-11-19 05:00:36,532 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2023-11-19 05:00:36,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-19 05:00:36,533 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:00:36,533 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:00:36,533 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-11-19 05:00:36,533 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)] === [2023-11-19 05:00:36,534 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:00:36,534 INFO L85 PathProgramCache]: Analyzing trace with hash -679049794, now seen corresponding path program 1 times [2023-11-19 05:00:36,534 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:00:36,534 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2095401538] [2023-11-19 05:00:36,535 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:00:36,535 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:00:36,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:00:36,660 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:00:36,660 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:00:36,660 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2095401538] [2023-11-19 05:00:36,660 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2095401538] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:00:36,661 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:00:36,661 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-19 05:00:36,661 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1463929679] [2023-11-19 05:00:36,661 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:00:36,661 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-19 05:00:36,662 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:00:36,662 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-19 05:00:36,662 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-19 05:00:36,663 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) [2023-11-19 05:00:36,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:00:36,684 INFO L93 Difference]: Finished difference Result 20 states and 24 transitions. [2023-11-19 05:00:36,685 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-19 05:00:36,685 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 [2023-11-19 05:00:36,685 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:00:36,686 INFO L225 Difference]: With dead ends: 20 [2023-11-19 05:00:36,686 INFO L226 Difference]: Without dead ends: 17 [2023-11-19 05:00:36,686 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 [2023-11-19 05:00:36,687 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 [2023-11-19 05:00:36,687 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] [2023-11-19 05:00:36,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2023-11-19 05:00:36,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2023-11-19 05:00:36,690 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) [2023-11-19 05:00:36,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2023-11-19 05:00:36,690 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 8 [2023-11-19 05:00:36,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:00:36,691 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2023-11-19 05:00:36,691 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) [2023-11-19 05:00:36,691 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2023-11-19 05:00:36,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-19 05:00:36,692 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:00:36,692 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:00:36,692 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-11-19 05:00:36,692 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)] === [2023-11-19 05:00:36,693 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:00:36,693 INFO L85 PathProgramCache]: Analyzing trace with hash -679211920, now seen corresponding path program 1 times [2023-11-19 05:00:36,693 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:00:36,694 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1045538410] [2023-11-19 05:00:36,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:00:36,694 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:00:36,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:00:36,919 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:00:36,920 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:00:36,920 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1045538410] [2023-11-19 05:00:36,920 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1045538410] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:00:36,920 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:00:36,920 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-19 05:00:36,920 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [400243263] [2023-11-19 05:00:36,920 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:00:36,921 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-19 05:00:36,921 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:00:36,921 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-19 05:00:36,922 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-19 05:00:36,922 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) [2023-11-19 05:00:37,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:00:37,007 INFO L93 Difference]: Finished difference Result 22 states and 24 transitions. [2023-11-19 05:00:37,007 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-19 05:00:37,008 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 [2023-11-19 05:00:37,008 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:00:37,008 INFO L225 Difference]: With dead ends: 22 [2023-11-19 05:00:37,008 INFO L226 Difference]: Without dead ends: 19 [2023-11-19 05:00:37,008 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2023-11-19 05:00:37,009 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, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:00:37,009 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 23 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:00:37,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2023-11-19 05:00:37,011 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 18. [2023-11-19 05:00:37,011 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) [2023-11-19 05:00:37,012 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2023-11-19 05:00:37,012 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 8 [2023-11-19 05:00:37,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:00:37,012 INFO L495 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2023-11-19 05:00:37,012 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) [2023-11-19 05:00:37,013 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2023-11-19 05:00:37,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-11-19 05:00:37,013 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:00:37,013 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:00:37,013 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-11-19 05:00:37,014 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)] === [2023-11-19 05:00:37,014 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:00:37,014 INFO L85 PathProgramCache]: Analyzing trace with hash 1009868217, now seen corresponding path program 1 times [2023-11-19 05:00:37,014 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:00:37,014 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1563154922] [2023-11-19 05:00:37,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:00:37,015 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:00:37,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:00:37,287 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:00:37,287 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:00:37,288 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1563154922] [2023-11-19 05:00:37,288 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1563154922] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:00:37,288 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1495967880] [2023-11-19 05:00:37,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:00:37,288 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:00:37,289 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:00:37,290 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:00:37,303 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-19 05:00:37,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:00:37,377 INFO L262 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 18 conjunts are in the unsatisfiable core [2023-11-19 05:00:37,379 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:00:37,390 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-11-19 05:00:37,468 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:00:37,468 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:00:37,588 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:00:37,588 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1495967880] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:00:37,588 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [606414993] [2023-11-19 05:00:37,591 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-19 05:00:37,591 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:00:37,592 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:00:37,592 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:00:37,592 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:00:38,625 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:00:39,368 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 [2023-11-19 05:00:39,369 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:00:39,369 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:00:39,369 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 14 [2023-11-19 05:00:39,369 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1395646951] [2023-11-19 05:00:39,369 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:00:39,370 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-11-19 05:00:39,370 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:00:39,373 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-11-19 05:00:39,374 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=424, Unknown=0, NotChecked=0, Total=506 [2023-11-19 05:00:39,376 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) [2023-11-19 05:00:39,539 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:00:39,539 INFO L93 Difference]: Finished difference Result 23 states and 26 transitions. [2023-11-19 05:00:39,540 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-19 05:00:39,540 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 [2023-11-19 05:00:39,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:00:39,541 INFO L225 Difference]: With dead ends: 23 [2023-11-19 05:00:39,541 INFO L226 Difference]: Without dead ends: 19 [2023-11-19 05:00:39,541 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 [2023-11-19 05:00:39,542 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 [2023-11-19 05:00:39,543 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] [2023-11-19 05:00:39,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2023-11-19 05:00:39,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 15. [2023-11-19 05:00:39,546 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) [2023-11-19 05:00:39,547 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2023-11-19 05:00:39,547 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 10 [2023-11-19 05:00:39,547 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:00:39,547 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2023-11-19 05:00:39,548 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) [2023-11-19 05:00:39,548 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2023-11-19 05:00:39,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-11-19 05:00:39,548 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:00:39,548 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2023-11-19 05:00:39,574 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-19 05:00:39,769 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-11-19 05:00:39,770 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)] === [2023-11-19 05:00:39,770 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:00:39,770 INFO L85 PathProgramCache]: Analyzing trace with hash -432875804, now seen corresponding path program 2 times [2023-11-19 05:00:39,770 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:00:39,771 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2078422488] [2023-11-19 05:00:39,771 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:00:39,771 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:00:39,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:00:40,119 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:00:40,119 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:00:40,119 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2078422488] [2023-11-19 05:00:40,119 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2078422488] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:00:40,119 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1966875921] [2023-11-19 05:00:40,120 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-19 05:00:40,120 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:00:40,120 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:00:40,121 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:00:40,148 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-19 05:00:40,203 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-19 05:00:40,204 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 05:00:40,205 INFO L262 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 27 conjunts are in the unsatisfiable core [2023-11-19 05:00:40,208 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:00:40,278 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-11-19 05:00:40,332 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:00:40,332 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:00:40,357 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2023-11-19 05:00:40,361 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2023-11-19 05:00:40,416 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:00:40,417 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1966875921] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:00:40,417 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [470450406] [2023-11-19 05:00:40,421 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-19 05:00:40,421 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:00:40,421 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:00:40,421 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:00:40,422 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:00:41,268 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:00:42,087 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '686#(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 [2023-11-19 05:00:42,087 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:00:42,087 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:00:42,087 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 17 [2023-11-19 05:00:42,087 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1510488819] [2023-11-19 05:00:42,087 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:00:42,088 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-11-19 05:00:42,088 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:00:42,088 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-11-19 05:00:42,089 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=523, Unknown=0, NotChecked=0, Total=600 [2023-11-19 05:00:42,089 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand has 18 states, 18 states have (on average 1.5555555555555556) internal successors, (28), 17 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) [2023-11-19 05:00:42,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:00:42,299 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2023-11-19 05:00:42,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-19 05:00:42,300 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.5555555555555556) internal successors, (28), 17 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) Word has length 14 [2023-11-19 05:00:42,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:00:42,300 INFO L225 Difference]: With dead ends: 25 [2023-11-19 05:00:42,301 INFO L226 Difference]: Without dead ends: 18 [2023-11-19 05:00:42,301 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 189 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=134, Invalid=796, Unknown=0, NotChecked=0, Total=930 [2023-11-19 05:00:42,302 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 23 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 98 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 99 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 98 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:00:42,302 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 18 Invalid, 99 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 98 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:00:42,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2023-11-19 05:00:42,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2023-11-19 05:00:42,304 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) [2023-11-19 05:00:42,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2023-11-19 05:00:42,305 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 14 [2023-11-19 05:00:42,305 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:00:42,305 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2023-11-19 05:00:42,305 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 1.5555555555555556) internal successors, (28), 17 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) [2023-11-19 05:00:42,305 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2023-11-19 05:00:42,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-11-19 05:00:42,306 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:00:42,306 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1] [2023-11-19 05:00:42,332 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-19 05:00:42,507 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:00:42,507 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)] === [2023-11-19 05:00:42,508 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:00:42,508 INFO L85 PathProgramCache]: Analyzing trace with hash 1132875117, now seen corresponding path program 3 times [2023-11-19 05:00:42,508 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:00:42,508 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [673552933] [2023-11-19 05:00:42,508 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:00:42,508 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:00:42,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:00:42,823 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:00:42,823 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:00:42,823 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [673552933] [2023-11-19 05:00:42,823 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [673552933] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:00:42,823 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [856613493] [2023-11-19 05:00:42,823 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-19 05:00:42,824 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:00:42,824 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:00:42,825 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:00:42,843 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-19 05:00:42,900 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-19 05:00:42,900 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 05:00:42,901 INFO L262 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 23 conjunts are in the unsatisfiable core [2023-11-19 05:00:42,903 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:00:42,911 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-11-19 05:00:43,017 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 1 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:00:43,018 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:00:43,223 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 1 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:00:43,224 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [856613493] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:00:43,224 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1775952984] [2023-11-19 05:00:43,226 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-19 05:00:43,226 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:00:43,227 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:00:43,227 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:00:43,227 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:00:43,886 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:00:44,683 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '857#(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 [2023-11-19 05:00:44,683 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:00:44,683 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:00:44,684 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7, 7] total 18 [2023-11-19 05:00:44,684 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1054994658] [2023-11-19 05:00:44,684 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:00:44,684 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-11-19 05:00:44,684 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:00:44,685 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-11-19 05:00:44,685 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=609, Unknown=0, NotChecked=0, Total=702 [2023-11-19 05:00:44,686 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) [2023-11-19 05:00:44,914 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:00:44,914 INFO L93 Difference]: Finished difference Result 24 states and 25 transitions. [2023-11-19 05:00:44,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-19 05:00:44,915 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 [2023-11-19 05:00:44,915 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:00:44,916 INFO L225 Difference]: With dead ends: 24 [2023-11-19 05:00:44,916 INFO L226 Difference]: Without dead ends: 24 [2023-11-19 05:00:44,916 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 [2023-11-19 05:00:44,917 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 64 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 110 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 112 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 110 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:00:44,917 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [64 Valid, 18 Invalid, 112 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 110 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:00:44,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2023-11-19 05:00:44,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 21. [2023-11-19 05:00:44,920 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) [2023-11-19 05:00:44,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2023-11-19 05:00:44,920 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 16 [2023-11-19 05:00:44,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:00:44,921 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2023-11-19 05:00:44,921 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) [2023-11-19 05:00:44,921 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2023-11-19 05:00:44,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-11-19 05:00:44,922 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:00:44,922 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 1, 1, 1, 1] [2023-11-19 05:00:44,944 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-19 05:00:45,139 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:00:45,140 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)] === [2023-11-19 05:00:45,140 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:00:45,140 INFO L85 PathProgramCache]: Analyzing trace with hash 1432407192, now seen corresponding path program 4 times [2023-11-19 05:00:45,140 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:00:45,141 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1561912050] [2023-11-19 05:00:45,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:00:45,141 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:00:45,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:00:45,603 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 7 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:00:45,604 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:00:45,604 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1561912050] [2023-11-19 05:00:45,604 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1561912050] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:00:45,604 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1855599938] [2023-11-19 05:00:45,605 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-19 05:00:45,605 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:00:45,605 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:00:45,606 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:00:45,623 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-19 05:00:45,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:00:45,688 INFO L262 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 33 conjunts are in the unsatisfiable core [2023-11-19 05:00:45,691 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:00:45,780 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-11-19 05:00:45,818 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 7 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:00:45,818 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:00:45,841 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2023-11-19 05:00:45,843 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2023-11-19 05:00:45,917 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 7 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:00:45,917 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1855599938] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:00:45,917 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1588108837] [2023-11-19 05:00:45,920 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-19 05:00:45,920 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:00:45,920 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:00:45,921 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:00:45,921 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:00:46,541 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:00:47,297 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1052#(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 [2023-11-19 05:00:47,297 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:00:47,297 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:00:47,298 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 18 [2023-11-19 05:00:47,298 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1506542406] [2023-11-19 05:00:47,298 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:00:47,298 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2023-11-19 05:00:47,298 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:00:47,299 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2023-11-19 05:00:47,299 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=573, Unknown=0, NotChecked=0, Total=650 [2023-11-19 05:00:47,300 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) [2023-11-19 05:00:47,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:00:47,534 INFO L93 Difference]: Finished difference Result 35 states and 36 transitions. [2023-11-19 05:00:47,534 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-11-19 05:00:47,534 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 [2023-11-19 05:00:47,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:00:47,535 INFO L225 Difference]: With dead ends: 35 [2023-11-19 05:00:47,535 INFO L226 Difference]: Without dead ends: 24 [2023-11-19 05:00:47,536 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 [2023-11-19 05:00:47,536 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 43 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 180 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 182 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 180 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:00:47,536 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [43 Valid, 32 Invalid, 182 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 180 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:00:47,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2023-11-19 05:00:47,538 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2023-11-19 05:00:47,538 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) [2023-11-19 05:00:47,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2023-11-19 05:00:47,539 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 20 [2023-11-19 05:00:47,539 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:00:47,539 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2023-11-19 05:00:47,539 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) [2023-11-19 05:00:47,539 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2023-11-19 05:00:47,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-11-19 05:00:47,540 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:00:47,540 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 1, 1, 1, 1] [2023-11-19 05:00:47,567 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-19 05:00:47,752 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:00:47,752 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)] === [2023-11-19 05:00:47,752 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:00:47,752 INFO L85 PathProgramCache]: Analyzing trace with hash -1762035615, now seen corresponding path program 5 times [2023-11-19 05:00:47,753 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:00:47,753 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [744414821] [2023-11-19 05:00:47,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:00:47,753 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:00:47,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:00:48,071 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 1 proven. 23 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:00:48,071 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:00:48,071 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [744414821] [2023-11-19 05:00:48,071 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [744414821] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:00:48,072 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [109897122] [2023-11-19 05:00:48,072 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-19 05:00:48,072 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:00:48,072 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:00:48,073 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:00:48,099 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-19 05:00:48,167 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-11-19 05:00:48,167 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 05:00:48,169 INFO L262 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 26 conjunts are in the unsatisfiable core [2023-11-19 05:00:48,171 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:00:48,176 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-11-19 05:00:48,322 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 4 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:00:48,323 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:00:48,593 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 4 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:00:48,593 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [109897122] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:00:48,594 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1220724194] [2023-11-19 05:00:48,599 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-19 05:00:48,599 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:00:48,600 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:00:48,600 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:00:48,600 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:00:49,204 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:00:49,946 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1283#(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 [2023-11-19 05:00:49,946 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:00:49,946 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:00:49,946 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 9] total 26 [2023-11-19 05:00:49,946 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [543465686] [2023-11-19 05:00:49,947 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:00:49,947 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2023-11-19 05:00:49,947 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:00:49,948 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2023-11-19 05:00:49,949 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=150, Invalid=1040, Unknown=0, NotChecked=0, Total=1190 [2023-11-19 05:00:49,949 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) [2023-11-19 05:00:50,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:00:50,245 INFO L93 Difference]: Finished difference Result 30 states and 31 transitions. [2023-11-19 05:00:50,246 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-11-19 05:00:50,246 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 [2023-11-19 05:00:50,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:00:50,247 INFO L225 Difference]: With dead ends: 30 [2023-11-19 05:00:50,247 INFO L226 Difference]: Without dead ends: 30 [2023-11-19 05:00:50,248 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 [2023-11-19 05:00:50,248 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 32 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 217 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 218 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 217 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:00:50,249 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [32 Valid, 33 Invalid, 218 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 217 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:00:50,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2023-11-19 05:00:50,251 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 27. [2023-11-19 05:00:50,251 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) [2023-11-19 05:00:50,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2023-11-19 05:00:50,252 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 22 [2023-11-19 05:00:50,252 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:00:50,252 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2023-11-19 05:00:50,252 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) [2023-11-19 05:00:50,252 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2023-11-19 05:00:50,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-11-19 05:00:50,254 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:00:50,254 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 1, 1, 1, 1] [2023-11-19 05:00:50,283 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-19 05:00:50,464 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:00:50,464 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)] === [2023-11-19 05:00:50,464 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:00:50,464 INFO L85 PathProgramCache]: Analyzing trace with hash 345857420, now seen corresponding path program 6 times [2023-11-19 05:00:50,465 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:00:50,465 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1647431181] [2023-11-19 05:00:50,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:00:50,465 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:00:50,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:00:50,976 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 10 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:00:50,976 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:00:50,976 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1647431181] [2023-11-19 05:00:50,976 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1647431181] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:00:50,976 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1405425398] [2023-11-19 05:00:50,977 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-19 05:00:50,977 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:00:50,977 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:00:50,978 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:00:50,988 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-19 05:00:51,074 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-19 05:00:51,074 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 05:00:51,076 INFO L262 TraceCheckSpWp]: Trace formula consists of 170 conjuncts, 41 conjunts are in the unsatisfiable core [2023-11-19 05:00:51,078 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:00:51,247 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-11-19 05:00:51,309 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2023-11-19 05:00:51,312 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 10 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:00:51,312 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:00:51,347 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2023-11-19 05:00:51,349 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2023-11-19 05:00:51,415 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 10 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:00:51,415 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1405425398] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:00:51,416 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2104038739] [2023-11-19 05:00:51,418 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-19 05:00:51,418 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:00:51,419 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:00:51,419 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:00:51,419 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:00:52,086 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:00:52,915 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1531#(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 [2023-11-19 05:00:52,915 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:00:52,915 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:00:52,915 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 21 [2023-11-19 05:00:52,916 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [527436559] [2023-11-19 05:00:52,916 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:00:52,916 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2023-11-19 05:00:52,917 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:00:52,917 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2023-11-19 05:00:52,918 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=728, Unknown=0, NotChecked=0, Total=812 [2023-11-19 05:00:52,918 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) [2023-11-19 05:00:53,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:00:53,271 INFO L93 Difference]: Finished difference Result 45 states and 46 transitions. [2023-11-19 05:00:53,276 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-11-19 05:00:53,276 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 [2023-11-19 05:00:53,276 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:00:53,276 INFO L225 Difference]: With dead ends: 45 [2023-11-19 05:00:53,277 INFO L226 Difference]: Without dead ends: 30 [2023-11-19 05:00:53,278 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 181 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=142, Invalid=1190, Unknown=0, NotChecked=0, Total=1332 [2023-11-19 05:00:53,278 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 47 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 255 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 258 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 255 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-19 05:00:53,279 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [47 Valid, 47 Invalid, 258 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 255 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-19 05:00:53,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2023-11-19 05:00:53,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2023-11-19 05:00:53,281 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) [2023-11-19 05:00:53,281 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2023-11-19 05:00:53,281 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 26 [2023-11-19 05:00:53,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:00:53,281 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2023-11-19 05:00:53,282 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) [2023-11-19 05:00:53,282 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2023-11-19 05:00:53,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-11-19 05:00:53,282 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:00:53,283 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 1, 1, 1, 1] [2023-11-19 05:00:53,308 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-19 05:00:53,483 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2023-11-19 05:00:53,484 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)] === [2023-11-19 05:00:53,484 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:00:53,484 INFO L85 PathProgramCache]: Analyzing trace with hash 378424981, now seen corresponding path program 7 times [2023-11-19 05:00:53,484 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:00:53,484 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [574935159] [2023-11-19 05:00:53,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:00:53,484 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:00:53,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:00:53,975 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:00:53,976 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:00:53,976 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [574935159] [2023-11-19 05:00:53,976 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [574935159] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:00:53,976 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [418795753] [2023-11-19 05:00:53,976 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-19 05:00:53,976 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:00:53,976 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:00:53,978 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:00:54,005 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-19 05:00:54,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:00:54,070 INFO L262 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 33 conjunts are in the unsatisfiable core [2023-11-19 05:00:54,074 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:00:54,081 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-11-19 05:00:54,263 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 9 proven. 35 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:00:54,263 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:00:54,665 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 9 proven. 35 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:00:54,665 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [418795753] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:00:54,665 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2053709507] [2023-11-19 05:00:54,667 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-19 05:00:54,667 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:00:54,668 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:00:54,668 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:00:54,668 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:00:55,249 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:00:56,028 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1820#(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 [2023-11-19 05:00:56,029 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:00:56,029 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:00:56,029 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11, 11] total 28 [2023-11-19 05:00:56,029 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1419563263] [2023-11-19 05:00:56,029 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:00:56,030 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2023-11-19 05:00:56,030 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:00:56,030 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2023-11-19 05:00:56,031 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=1174, Unknown=0, NotChecked=0, Total=1332 [2023-11-19 05:00:56,032 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) [2023-11-19 05:00:56,468 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:00:56,469 INFO L93 Difference]: Finished difference Result 36 states and 37 transitions. [2023-11-19 05:00:56,473 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-11-19 05:00:56,474 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 [2023-11-19 05:00:56,474 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:00:56,474 INFO L225 Difference]: With dead ends: 36 [2023-11-19 05:00:56,475 INFO L226 Difference]: Without dead ends: 36 [2023-11-19 05:00:56,476 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 [2023-11-19 05:00:56,477 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 61 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 244 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 245 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 244 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-19 05:00:56,477 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [61 Valid, 41 Invalid, 245 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 244 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-19 05:00:56,478 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2023-11-19 05:00:56,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 33. [2023-11-19 05:00:56,480 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) [2023-11-19 05:00:56,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2023-11-19 05:00:56,480 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 28 [2023-11-19 05:00:56,481 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:00:56,481 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2023-11-19 05:00:56,481 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) [2023-11-19 05:00:56,481 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2023-11-19 05:00:56,482 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2023-11-19 05:00:56,482 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:00:56,482 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 1, 1, 1, 1] [2023-11-19 05:00:56,500 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-19 05:00:56,691 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2023-11-19 05:00:56,692 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)] === [2023-11-19 05:00:56,692 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:00:56,692 INFO L85 PathProgramCache]: Analyzing trace with hash 1957951936, now seen corresponding path program 8 times [2023-11-19 05:00:56,692 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:00:56,692 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1044457327] [2023-11-19 05:00:56,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:00:56,693 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:00:56,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:00:57,267 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 13 proven. 48 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:00:57,267 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:00:57,267 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1044457327] [2023-11-19 05:00:57,267 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1044457327] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:00:57,267 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1909106584] [2023-11-19 05:00:57,267 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-19 05:00:57,267 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:00:57,268 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:00:57,269 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:00:57,291 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-19 05:00:57,393 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2023-11-19 05:00:57,393 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 05:00:57,395 INFO L262 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 45 conjunts are in the unsatisfiable core [2023-11-19 05:00:57,398 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:00:57,537 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-11-19 05:00:57,603 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 13 proven. 48 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:00:57,603 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:00:57,639 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2023-11-19 05:00:57,646 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2023-11-19 05:00:57,727 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 13 proven. 48 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:00:57,727 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1909106584] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:00:57,727 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1121754787] [2023-11-19 05:00:57,729 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-19 05:00:57,730 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:00:57,731 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:00:57,731 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:00:57,731 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:00:58,281 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:00:59,075 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2121#(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 [2023-11-19 05:00:59,076 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:00:59,076 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:00:59,076 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 24 [2023-11-19 05:00:59,076 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [109783219] [2023-11-19 05:00:59,076 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:00:59,077 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-11-19 05:00:59,077 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:00:59,078 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-11-19 05:00:59,078 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=901, Unknown=0, NotChecked=0, Total=992 [2023-11-19 05:00:59,079 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand has 25 states, 25 states have (on average 2.0) internal successors, (50), 24 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:00:59,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:00:59,577 INFO L93 Difference]: Finished difference Result 55 states and 56 transitions. [2023-11-19 05:00:59,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2023-11-19 05:00:59,578 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.0) internal successors, (50), 24 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2023-11-19 05:00:59,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:00:59,578 INFO L225 Difference]: With dead ends: 55 [2023-11-19 05:00:59,578 INFO L226 Difference]: Without dead ends: 36 [2023-11-19 05:00:59,580 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 222 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=161, Invalid=1561, Unknown=0, NotChecked=0, Total=1722 [2023-11-19 05:00:59,581 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 59 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 441 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 79 SdHoareTripleChecker+Invalid, 445 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 441 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-19 05:00:59,581 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [59 Valid, 79 Invalid, 445 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 441 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-19 05:00:59,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2023-11-19 05:00:59,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2023-11-19 05:00:59,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.0588235294117647) internal successors, (36), 34 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:00:59,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2023-11-19 05:00:59,584 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 32 [2023-11-19 05:00:59,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:00:59,585 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2023-11-19 05:00:59,585 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 2.0) internal successors, (50), 24 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:00:59,585 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2023-11-19 05:00:59,586 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2023-11-19 05:00:59,586 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:00:59,587 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 1, 1, 1, 1] [2023-11-19 05:00:59,613 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-11-19 05:00:59,809 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2023-11-19 05:00:59,809 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 8 more)] === [2023-11-19 05:00:59,809 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:00:59,809 INFO L85 PathProgramCache]: Analyzing trace with hash -595312631, now seen corresponding path program 9 times [2023-11-19 05:00:59,810 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:00:59,810 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [687409378] [2023-11-19 05:00:59,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:00:59,810 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:00:59,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:01:00,298 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 9 proven. 61 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:01:00,298 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:01:00,299 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [687409378] [2023-11-19 05:01:00,299 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [687409378] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:01:00,299 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [525738342] [2023-11-19 05:01:00,299 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-19 05:01:00,299 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:01:00,299 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:01:00,304 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:01:00,306 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-11-19 05:01:00,415 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-19 05:01:00,415 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 05:01:00,417 INFO L262 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 41 conjunts are in the unsatisfiable core [2023-11-19 05:01:00,420 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:01:00,425 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-11-19 05:01:00,670 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 16 proven. 54 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:01:00,670 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:01:01,159 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 16 proven. 54 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:01:01,159 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [525738342] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:01:01,160 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1331112986] [2023-11-19 05:01:01,167 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-19 05:01:01,167 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:01:01,167 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:01:01,167 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:01:01,168 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:01:01,750 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:01:02,516 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2469#(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 [2023-11-19 05:01:02,516 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:01:02,516 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:01:02,517 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 31 [2023-11-19 05:01:02,517 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [100893119] [2023-11-19 05:01:02,517 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:01:02,517 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2023-11-19 05:01:02,518 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:01:02,518 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2023-11-19 05:01:02,519 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=1370, Unknown=0, NotChecked=0, Total=1560 [2023-11-19 05:01:02,519 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand has 33 states, 32 states have (on average 2.65625) internal successors, (85), 32 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:01:03,034 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:01:03,034 INFO L93 Difference]: Finished difference Result 42 states and 43 transitions. [2023-11-19 05:01:03,034 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2023-11-19 05:01:03,034 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 32 states have (on average 2.65625) internal successors, (85), 32 states have internal predecessors, (85), 0 states have call successors, (0), 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 34 [2023-11-19 05:01:03,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:01:03,035 INFO L225 Difference]: With dead ends: 42 [2023-11-19 05:01:03,035 INFO L226 Difference]: Without dead ends: 42 [2023-11-19 05:01:03,036 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 614 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=332, Invalid=2020, Unknown=0, NotChecked=0, Total=2352 [2023-11-19 05:01:03,037 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 124 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 373 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 124 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 377 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 373 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-19 05:01:03,037 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [124 Valid, 62 Invalid, 377 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 373 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-19 05:01:03,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2023-11-19 05:01:03,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 39. [2023-11-19 05:01:03,040 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 38 states have (on average 1.0526315789473684) internal successors, (40), 38 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:01:03,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2023-11-19 05:01:03,040 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 34 [2023-11-19 05:01:03,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:01:03,041 INFO L495 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2023-11-19 05:01:03,041 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 32 states have (on average 2.65625) internal successors, (85), 32 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:01:03,041 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2023-11-19 05:01:03,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2023-11-19 05:01:03,042 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:01:03,042 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 1, 1, 1, 1] [2023-11-19 05:01:03,070 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-11-19 05:01:03,243 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2023-11-19 05:01:03,243 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 8 more)] === [2023-11-19 05:01:03,243 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:01:03,243 INFO L85 PathProgramCache]: Analyzing trace with hash -2102652620, now seen corresponding path program 10 times [2023-11-19 05:01:03,243 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:01:03,244 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1950589100] [2023-11-19 05:01:03,244 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:01:03,244 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:01:03,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:01:03,902 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 16 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:01:03,903 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:01:03,903 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1950589100] [2023-11-19 05:01:03,903 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1950589100] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:01:03,903 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1632495982] [2023-11-19 05:01:03,903 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-19 05:01:03,903 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:01:03,904 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:01:03,905 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:01:03,919 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-11-19 05:01:04,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:01:04,020 INFO L262 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 51 conjunts are in the unsatisfiable core [2023-11-19 05:01:04,024 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:01:04,191 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-11-19 05:01:04,248 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 16 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:01:04,248 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:01:04,305 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2023-11-19 05:01:04,307 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2023-11-19 05:01:04,384 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 16 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:01:04,384 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1632495982] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:01:04,384 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [273547460] [2023-11-19 05:01:04,386 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-19 05:01:04,386 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:01:04,387 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:01:04,387 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:01:04,387 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:01:04,865 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:01:05,672 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2825#(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 [2023-11-19 05:01:05,672 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:01:05,673 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:01:05,673 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 27 [2023-11-19 05:01:05,673 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1300934391] [2023-11-19 05:01:05,673 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:01:05,674 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2023-11-19 05:01:05,674 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:01:05,675 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2023-11-19 05:01:05,675 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1092, Unknown=0, NotChecked=0, Total=1190 [2023-11-19 05:01:05,676 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand has 28 states, 28 states have (on average 2.0714285714285716) internal successors, (58), 27 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:01:06,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:01:06,282 INFO L93 Difference]: Finished difference Result 65 states and 66 transitions. [2023-11-19 05:01:06,283 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2023-11-19 05:01:06,283 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.0714285714285716) internal successors, (58), 27 states have internal predecessors, (58), 0 states have call successors, (0), 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 38 [2023-11-19 05:01:06,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:01:06,284 INFO L225 Difference]: With dead ends: 65 [2023-11-19 05:01:06,284 INFO L226 Difference]: Without dead ends: 42 [2023-11-19 05:01:06,285 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 268 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=180, Invalid=1982, Unknown=0, NotChecked=0, Total=2162 [2023-11-19 05:01:06,285 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 27 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 599 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 604 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 599 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-19 05:01:06,286 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 108 Invalid, 604 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 599 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-19 05:01:06,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2023-11-19 05:01:06,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2023-11-19 05:01:06,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 40 states have (on average 1.05) internal successors, (42), 40 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) [2023-11-19 05:01:06,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 42 transitions. [2023-11-19 05:01:06,289 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 42 transitions. Word has length 38 [2023-11-19 05:01:06,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:01:06,290 INFO L495 AbstractCegarLoop]: Abstraction has 41 states and 42 transitions. [2023-11-19 05:01:06,290 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 2.0714285714285716) internal successors, (58), 27 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:01:06,290 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 42 transitions. [2023-11-19 05:01:06,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2023-11-19 05:01:06,291 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:01:06,291 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 1, 1, 1, 1] [2023-11-19 05:01:06,313 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2023-11-19 05:01:06,503 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:01:06,504 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 8 more)] === [2023-11-19 05:01:06,504 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:01:06,504 INFO L85 PathProgramCache]: Analyzing trace with hash -665404227, now seen corresponding path program 11 times [2023-11-19 05:01:06,504 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:01:06,504 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [506469526] [2023-11-19 05:01:06,504 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:01:06,505 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:01:06,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:01:07,164 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 16 proven. 86 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:01:07,164 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:01:07,164 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [506469526] [2023-11-19 05:01:07,164 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [506469526] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:01:07,164 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [495815762] [2023-11-19 05:01:07,164 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-19 05:01:07,165 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:01:07,165 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:01:07,166 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:01:07,183 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-11-19 05:01:07,291 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2023-11-19 05:01:07,291 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 05:01:07,293 INFO L262 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 37 conjunts are in the unsatisfiable core [2023-11-19 05:01:07,312 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:01:07,685 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 25 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:01:07,686 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:01:08,014 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2023-11-19 05:01:08,151 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 25 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:01:08,151 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [495815762] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:01:08,151 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1534998791] [2023-11-19 05:01:08,153 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-19 05:01:08,154 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:01:08,154 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:01:08,154 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:01:08,154 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:01:08,581 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:01:09,359 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3235#(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 [2023-11-19 05:01:09,360 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:01:09,360 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:01:09,360 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 15, 15] total 37 [2023-11-19 05:01:09,360 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2125317935] [2023-11-19 05:01:09,360 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:01:09,361 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2023-11-19 05:01:09,361 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:01:09,361 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2023-11-19 05:01:09,362 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=270, Invalid=1800, Unknown=0, NotChecked=0, Total=2070 [2023-11-19 05:01:09,363 INFO L87 Difference]: Start difference. First operand 41 states and 42 transitions. Second operand has 39 states, 38 states have (on average 2.789473684210526) internal successors, (106), 38 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:01:09,911 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:01:09,911 INFO L93 Difference]: Finished difference Result 48 states and 49 transitions. [2023-11-19 05:01:09,912 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2023-11-19 05:01:09,912 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 38 states have (on average 2.789473684210526) internal successors, (106), 38 states have internal predecessors, (106), 0 states have call successors, (0), 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 40 [2023-11-19 05:01:09,912 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:01:09,913 INFO L225 Difference]: With dead ends: 48 [2023-11-19 05:01:09,913 INFO L226 Difference]: Without dead ends: 48 [2023-11-19 05:01:09,914 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 81 SyntacticMatches, 7 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1099 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=399, Invalid=2571, Unknown=0, NotChecked=0, Total=2970 [2023-11-19 05:01:09,915 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 78 mSDsluCounter, 76 mSDsCounter, 0 mSdLazyCounter, 424 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 78 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 425 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 424 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-19 05:01:09,916 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [78 Valid, 83 Invalid, 425 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 424 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-19 05:01:09,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2023-11-19 05:01:09,918 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 45. [2023-11-19 05:01:09,919 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 44 states have (on average 1.0454545454545454) internal successors, (46), 44 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:01:09,919 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2023-11-19 05:01:09,919 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 40 [2023-11-19 05:01:09,919 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:01:09,920 INFO L495 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2023-11-19 05:01:09,920 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 38 states have (on average 2.789473684210526) internal successors, (106), 38 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:01:09,920 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2023-11-19 05:01:09,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2023-11-19 05:01:09,921 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:01:09,921 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 7, 7, 6, 6, 1, 1, 1, 1] [2023-11-19 05:01:09,948 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2023-11-19 05:01:10,138 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:01:10,139 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 8 more)] === [2023-11-19 05:01:10,139 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:01:10,139 INFO L85 PathProgramCache]: Analyzing trace with hash 583603176, now seen corresponding path program 12 times [2023-11-19 05:01:10,139 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:01:10,140 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [97297372] [2023-11-19 05:01:10,140 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:01:10,140 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:01:10,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:01:10,865 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 19 proven. 108 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:01:10,865 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:01:10,866 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [97297372] [2023-11-19 05:01:10,866 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [97297372] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:01:10,866 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1260398525] [2023-11-19 05:01:10,866 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-19 05:01:10,866 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:01:10,866 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:01:10,867 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:01:10,890 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-11-19 05:01:11,003 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-19 05:01:11,003 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 05:01:11,006 INFO L262 TraceCheckSpWp]: Trace formula consists of 269 conjuncts, 57 conjunts are in the unsatisfiable core [2023-11-19 05:01:11,009 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:01:11,228 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-11-19 05:01:11,299 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 19 proven. 108 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:01:11,300 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:01:11,349 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2023-11-19 05:01:11,352 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2023-11-19 05:01:11,441 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 19 proven. 108 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:01:11,441 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1260398525] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:01:11,441 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2129591984] [2023-11-19 05:01:11,443 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-19 05:01:11,443 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:01:11,443 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:01:11,444 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:01:11,444 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:01:11,966 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:01:12,787 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3642#(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 [2023-11-19 05:01:12,787 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:01:12,787 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:01:12,787 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 30 [2023-11-19 05:01:12,787 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [58009186] [2023-11-19 05:01:12,788 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:01:12,788 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2023-11-19 05:01:12,788 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:01:12,788 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2023-11-19 05:01:12,789 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1301, Unknown=0, NotChecked=0, Total=1406 [2023-11-19 05:01:12,789 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand has 31 states, 31 states have (on average 2.129032258064516) internal successors, (66), 30 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) [2023-11-19 05:01:13,520 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:01:13,520 INFO L93 Difference]: Finished difference Result 75 states and 76 transitions. [2023-11-19 05:01:13,520 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2023-11-19 05:01:13,520 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.129032258064516) internal successors, (66), 30 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 44 [2023-11-19 05:01:13,521 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:01:13,521 INFO L225 Difference]: With dead ends: 75 [2023-11-19 05:01:13,521 INFO L226 Difference]: Without dead ends: 48 [2023-11-19 05:01:13,522 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 112 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 319 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=199, Invalid=2453, Unknown=0, NotChecked=0, Total=2652 [2023-11-19 05:01:13,522 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 83 mSDsluCounter, 136 mSDsCounter, 0 mSdLazyCounter, 790 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 143 SdHoareTripleChecker+Invalid, 796 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 790 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-19 05:01:13,523 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [83 Valid, 143 Invalid, 796 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 790 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-19 05:01:13,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2023-11-19 05:01:13,525 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2023-11-19 05:01:13,525 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 46 states have (on average 1.0434782608695652) internal successors, (48), 46 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:01:13,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 48 transitions. [2023-11-19 05:01:13,526 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 48 transitions. Word has length 44 [2023-11-19 05:01:13,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:01:13,526 INFO L495 AbstractCegarLoop]: Abstraction has 47 states and 48 transitions. [2023-11-19 05:01:13,526 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 2.129032258064516) internal successors, (66), 30 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) [2023-11-19 05:01:13,527 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 48 transitions. [2023-11-19 05:01:13,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2023-11-19 05:01:13,528 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:01:13,528 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 1, 1, 1, 1] [2023-11-19 05:01:13,549 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2023-11-19 05:01:13,735 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:01:13,736 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 8 more)] === [2023-11-19 05:01:13,736 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:01:13,736 INFO L85 PathProgramCache]: Analyzing trace with hash 700265649, now seen corresponding path program 13 times [2023-11-19 05:01:13,736 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:01:13,736 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [755069107] [2023-11-19 05:01:13,736 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:01:13,736 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:01:13,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:01:14,518 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 25 proven. 115 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:01:14,518 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:01:14,518 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [755069107] [2023-11-19 05:01:14,518 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [755069107] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:01:14,518 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [716182865] [2023-11-19 05:01:14,518 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-19 05:01:14,518 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:01:14,519 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:01:14,520 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:01:14,543 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94726540-fed2-471e-b0cb-1686873eebb7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2023-11-19 05:01:14,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:01:14,647 INFO L262 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 47 conjunts are in the unsatisfiable core [2023-11-19 05:01:14,649 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:01:14,992 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 36 proven. 104 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:01:14,993 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:01:15,376 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2023-11-19 05:01:15,542 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 36 proven. 104 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:01:15,543 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [716182865] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:01:15,543 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [608295834] [2023-11-19 05:01:15,544 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-19 05:01:15,544 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:01:15,545 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:01:15,545 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:01:15,545 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:01:16,063 INFO L180 IcfgInterpreter]: Interpretation finished