./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/loops/string-1.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version e7bb482b Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/loops/string-1.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 7c71ebd98a3b6e7de0397eeeb86fda8d96b2d4c8ea0b8e1766ce392ff80613de --- Real Ultimate output --- This is Ultimate 0.2.3-dev-e7bb482 [2023-11-06 20:55:36,807 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-06 20:55:36,876 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2023-11-06 20:55:36,882 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-06 20:55:36,883 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-06 20:55:36,930 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-06 20:55:36,931 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-06 20:55:36,932 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-06 20:55:36,932 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-06 20:55:36,933 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-06 20:55:36,934 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-06 20:55:36,934 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-06 20:55:36,947 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-06 20:55:36,948 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-06 20:55:36,948 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-06 20:55:36,949 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-06 20:55:36,949 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-06 20:55:36,950 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-06 20:55:36,950 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-06 20:55:36,951 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-06 20:55:36,952 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-06 20:55:36,952 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-06 20:55:36,953 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-06 20:55:36,954 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-06 20:55:36,954 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-06 20:55:36,955 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-06 20:55:36,955 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-06 20:55:36,956 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-06 20:55:36,956 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-06 20:55:36,957 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-11-06 20:55:36,957 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2023-11-06 20:55:36,958 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-11-06 20:55:36,958 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-06 20:55:36,959 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-11-06 20:55:36,959 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-11-06 20:55:36,960 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-06 20:55:36,960 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-06 20:55:36,961 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-06 20:55:36,962 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-06 20:55:36,962 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-06 20:55:36,963 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-06 20:55:36,964 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-06 20:55:36,964 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-06 20:55:36,965 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-06 20:55:36,965 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-06 20:55:36,966 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-06 20:55:36,966 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_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 7c71ebd98a3b6e7de0397eeeb86fda8d96b2d4c8ea0b8e1766ce392ff80613de [2023-11-06 20:55:37,232 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-06 20:55:37,264 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-06 20:55:37,267 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-06 20:55:37,270 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-06 20:55:37,273 INFO L274 PluginConnector]: CDTParser initialized [2023-11-06 20:55:37,274 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/../../sv-benchmarks/c/loops/string-1.i [2023-11-06 20:55:40,542 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-06 20:55:40,740 INFO L384 CDTParser]: Found 1 translation units. [2023-11-06 20:55:40,741 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/sv-benchmarks/c/loops/string-1.i [2023-11-06 20:55:40,749 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/data/427cfecad/ee7c0f5edde443679a2dfdea55aa64b1/FLAG9ffb058ee [2023-11-06 20:55:40,765 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/data/427cfecad/ee7c0f5edde443679a2dfdea55aa64b1 [2023-11-06 20:55:40,768 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-06 20:55:40,769 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-06 20:55:40,771 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-06 20:55:40,771 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-06 20:55:40,777 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-06 20:55:40,778 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 08:55:40" (1/1) ... [2023-11-06 20:55:40,779 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@30605ce1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:55:40, skipping insertion in model container [2023-11-06 20:55:40,779 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 08:55:40" (1/1) ... [2023-11-06 20:55:40,804 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-06 20:55:40,986 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-06 20:55:40,997 INFO L202 MainTranslator]: Completed pre-run [2023-11-06 20:55:41,028 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-06 20:55:41,055 INFO L206 MainTranslator]: Completed translation [2023-11-06 20:55:41,056 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:55:41 WrapperNode [2023-11-06 20:55:41,056 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-06 20:55:41,057 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-06 20:55:41,058 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-06 20:55:41,058 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-06 20:55:41,066 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:55:41" (1/1) ... [2023-11-06 20:55:41,074 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:55:41" (1/1) ... [2023-11-06 20:55:41,099 INFO L138 Inliner]: procedures = 17, calls = 28, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 130 [2023-11-06 20:55:41,100 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-06 20:55:41,100 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-06 20:55:41,101 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-06 20:55:41,101 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-06 20:55:41,111 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:55:41" (1/1) ... [2023-11-06 20:55:41,111 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:55:41" (1/1) ... [2023-11-06 20:55:41,114 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:55:41" (1/1) ... [2023-11-06 20:55:41,114 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:55:41" (1/1) ... [2023-11-06 20:55:41,121 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:55:41" (1/1) ... [2023-11-06 20:55:41,126 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:55:41" (1/1) ... [2023-11-06 20:55:41,128 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:55:41" (1/1) ... [2023-11-06 20:55:41,129 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:55:41" (1/1) ... [2023-11-06 20:55:41,132 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-06 20:55:41,133 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-06 20:55:41,133 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-06 20:55:41,134 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-06 20:55:41,135 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:55:41" (1/1) ... [2023-11-06 20:55:41,142 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-06 20:55:41,160 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:55:41,175 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-06 20:55:41,191 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-06 20:55:41,237 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-06 20:55:41,237 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-06 20:55:41,238 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-06 20:55:41,238 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-06 20:55:41,238 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-06 20:55:41,238 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-06 20:55:41,239 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-06 20:55:41,239 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-06 20:55:41,318 INFO L236 CfgBuilder]: Building ICFG [2023-11-06 20:55:41,320 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-06 20:55:41,618 INFO L277 CfgBuilder]: Performing block encoding [2023-11-06 20:55:41,683 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-06 20:55:41,683 INFO L302 CfgBuilder]: Removed 5 assume(true) statements. [2023-11-06 20:55:41,686 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 08:55:41 BoogieIcfgContainer [2023-11-06 20:55:41,686 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-06 20:55:41,725 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-06 20:55:41,725 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-06 20:55:41,737 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-06 20:55:41,737 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 08:55:40" (1/3) ... [2023-11-06 20:55:41,738 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@f312421 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 08:55:41, skipping insertion in model container [2023-11-06 20:55:41,738 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:55:41" (2/3) ... [2023-11-06 20:55:41,739 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@f312421 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 08:55:41, skipping insertion in model container [2023-11-06 20:55:41,739 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 08:55:41" (3/3) ... [2023-11-06 20:55:41,741 INFO L112 eAbstractionObserver]: Analyzing ICFG string-1.i [2023-11-06 20:55:41,762 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-06 20:55:41,762 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 18 error locations. [2023-11-06 20:55:41,810 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-06 20:55:41,821 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;@72cdb9a3, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-06 20:55:41,822 INFO L358 AbstractCegarLoop]: Starting to check reachability of 18 error locations. [2023-11-06 20:55:41,831 INFO L276 IsEmpty]: Start isEmpty. Operand has 43 states, 24 states have (on average 2.25) internal successors, (54), 42 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:55:41,837 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2023-11-06 20:55:41,838 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:55:41,839 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2023-11-06 20:55:41,839 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 15 more)] === [2023-11-06 20:55:41,844 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:55:41,845 INFO L85 PathProgramCache]: Analyzing trace with hash 169932, now seen corresponding path program 1 times [2023-11-06 20:55:41,854 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:55:41,855 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2041886612] [2023-11-06 20:55:41,855 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:55:41,856 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:55:41,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:55:42,132 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:55:42,133 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:55:42,134 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2041886612] [2023-11-06 20:55:42,135 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2041886612] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:55:42,135 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 20:55:42,136 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-06 20:55:42,138 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2073718182] [2023-11-06 20:55:42,139 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:55:42,144 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-06 20:55:42,145 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:55:42,188 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-06 20:55:42,189 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-06 20:55:42,191 INFO L87 Difference]: Start difference. First operand has 43 states, 24 states have (on average 2.25) internal successors, (54), 42 states have internal predecessors, (54), 0 states have call successors, (0), 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, 3 states have (on average 1.0) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:55:42,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:55:42,328 INFO L93 Difference]: Finished difference Result 64 states and 72 transitions. [2023-11-06 20:55:42,330 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-06 20:55:42,332 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.0) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2023-11-06 20:55:42,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:55:42,344 INFO L225 Difference]: With dead ends: 64 [2023-11-06 20:55:42,345 INFO L226 Difference]: Without dead ends: 63 [2023-11-06 20:55:42,348 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-06 20:55:42,356 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 19 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:55:42,358 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 65 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:55:42,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2023-11-06 20:55:42,394 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 43. [2023-11-06 20:55:42,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 25 states have (on average 2.0) internal successors, (50), 42 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) [2023-11-06 20:55:42,397 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 50 transitions. [2023-11-06 20:55:42,399 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 50 transitions. Word has length 3 [2023-11-06 20:55:42,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:55:42,399 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 50 transitions. [2023-11-06 20:55:42,400 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.0) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:55:42,400 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 50 transitions. [2023-11-06 20:55:42,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2023-11-06 20:55:42,400 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:55:42,401 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2023-11-06 20:55:42,401 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-06 20:55:42,401 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 15 more)] === [2023-11-06 20:55:42,402 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:55:42,402 INFO L85 PathProgramCache]: Analyzing trace with hash 165614, now seen corresponding path program 1 times [2023-11-06 20:55:42,403 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:55:42,403 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1946107708] [2023-11-06 20:55:42,403 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:55:42,404 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:55:42,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:55:42,541 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:55:42,542 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:55:42,542 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1946107708] [2023-11-06 20:55:42,542 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1946107708] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:55:42,543 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 20:55:42,543 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-11-06 20:55:42,543 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [374835606] [2023-11-06 20:55:42,544 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:55:42,545 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-06 20:55:42,545 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:55:42,546 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-06 20:55:42,546 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-06 20:55:42,547 INFO L87 Difference]: Start difference. First operand 43 states and 50 transitions. Second operand has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:55:42,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:55:42,614 INFO L93 Difference]: Finished difference Result 39 states and 46 transitions. [2023-11-06 20:55:42,615 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-06 20:55:42,615 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2023-11-06 20:55:42,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:55:42,616 INFO L225 Difference]: With dead ends: 39 [2023-11-06 20:55:42,617 INFO L226 Difference]: Without dead ends: 39 [2023-11-06 20:55:42,617 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-06 20:55:42,619 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 37 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:55:42,620 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [37 Valid, 19 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:55:42,621 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2023-11-06 20:55:42,625 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2023-11-06 20:55:42,626 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 25 states have (on average 1.84) internal successors, (46), 38 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:55:42,627 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 46 transitions. [2023-11-06 20:55:42,628 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 46 transitions. Word has length 3 [2023-11-06 20:55:42,628 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:55:42,628 INFO L495 AbstractCegarLoop]: Abstraction has 39 states and 46 transitions. [2023-11-06 20:55:42,629 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:55:42,629 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 46 transitions. [2023-11-06 20:55:42,629 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2023-11-06 20:55:42,629 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:55:42,630 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2023-11-06 20:55:42,630 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-06 20:55:42,630 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 15 more)] === [2023-11-06 20:55:42,631 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:55:42,631 INFO L85 PathProgramCache]: Analyzing trace with hash 165615, now seen corresponding path program 1 times [2023-11-06 20:55:42,632 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:55:42,632 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1881496331] [2023-11-06 20:55:42,632 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:55:42,633 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:55:42,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:55:42,979 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:55:42,979 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:55:42,980 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1881496331] [2023-11-06 20:55:42,980 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1881496331] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:55:42,980 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 20:55:42,980 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-11-06 20:55:42,981 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [822504153] [2023-11-06 20:55:42,981 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:55:42,981 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-06 20:55:42,981 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:55:42,982 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-06 20:55:42,982 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-06 20:55:42,983 INFO L87 Difference]: Start difference. First operand 39 states and 46 transitions. Second operand has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:55:43,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:55:43,085 INFO L93 Difference]: Finished difference Result 40 states and 47 transitions. [2023-11-06 20:55:43,086 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-06 20:55:43,087 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2023-11-06 20:55:43,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:55:43,090 INFO L225 Difference]: With dead ends: 40 [2023-11-06 20:55:43,094 INFO L226 Difference]: Without dead ends: 40 [2023-11-06 20:55:43,095 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-06 20:55:43,103 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 0 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:55:43,103 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 49 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:55:43,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2023-11-06 20:55:43,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2023-11-06 20:55:43,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 26 states have (on average 1.8076923076923077) internal successors, (47), 39 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:55:43,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 47 transitions. [2023-11-06 20:55:43,109 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 47 transitions. Word has length 3 [2023-11-06 20:55:43,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:55:43,110 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 47 transitions. [2023-11-06 20:55:43,110 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:55:43,110 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 47 transitions. [2023-11-06 20:55:43,111 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2023-11-06 20:55:43,111 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:55:43,115 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2023-11-06 20:55:43,115 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-06 20:55:43,116 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 15 more)] === [2023-11-06 20:55:43,120 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:55:43,120 INFO L85 PathProgramCache]: Analyzing trace with hash 159282703, now seen corresponding path program 1 times [2023-11-06 20:55:43,120 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:55:43,121 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1059685795] [2023-11-06 20:55:43,121 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:55:43,121 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:55:43,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:55:43,171 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:55:43,172 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:55:43,172 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1059685795] [2023-11-06 20:55:43,172 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1059685795] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:55:43,172 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2072944357] [2023-11-06 20:55:43,173 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:55:43,173 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:55:43,173 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:55:43,178 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:55:43,198 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-06 20:55:43,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:55:43,257 INFO L262 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-06 20:55:43,262 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:55:43,323 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:55:43,323 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:55:43,352 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:55:43,352 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2072944357] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 20:55:43,352 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [620896807] [2023-11-06 20:55:43,375 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2023-11-06 20:55:43,375 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:55:43,382 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:55:43,386 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:55:43,387 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 20:55:44,047 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 20:55:44,211 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '350#(and (<= 2 |ULTIMATE.start_main_~#string_A~0#1.base|) (<= 1 |#StackHeapBarrier|) (<= 5 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_~#string_B~0#1.offset| 0) (= 0 |ULTIMATE.start_main_~#string_A~0#1.offset|) (<= 2 |ULTIMATE.start_main_~#string_B~0#1.base|) (<= (select |#length| |ULTIMATE.start_main_~#string_A~0#1.base|) 4) (= |ULTIMATE.start_main_~found~0#1| 0))' at error location [2023-11-06 20:55:44,211 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 20:55:44,211 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 20:55:44,212 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 5 [2023-11-06 20:55:44,212 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [450918642] [2023-11-06 20:55:44,212 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 20:55:44,213 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-06 20:55:44,214 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:55:44,215 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-06 20:55:44,216 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2023-11-06 20:55:44,217 INFO L87 Difference]: Start difference. First operand 40 states and 47 transitions. Second operand has 6 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:55:44,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:55:44,333 INFO L93 Difference]: Finished difference Result 72 states and 79 transitions. [2023-11-06 20:55:44,334 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-06 20:55:44,334 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2023-11-06 20:55:44,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:55:44,336 INFO L225 Difference]: With dead ends: 72 [2023-11-06 20:55:44,336 INFO L226 Difference]: Without dead ends: 72 [2023-11-06 20:55:44,339 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2023-11-06 20:55:44,344 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 33 mSDsluCounter, 81 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 111 SdHoareTripleChecker+Invalid, 71 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:55:44,346 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [33 Valid, 111 Invalid, 71 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 59 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:55:44,349 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2023-11-06 20:55:44,359 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 51. [2023-11-06 20:55:44,360 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 37 states have (on average 1.7837837837837838) internal successors, (66), 50 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:55:44,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 66 transitions. [2023-11-06 20:55:44,361 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 66 transitions. Word has length 5 [2023-11-06 20:55:44,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:55:44,361 INFO L495 AbstractCegarLoop]: Abstraction has 51 states and 66 transitions. [2023-11-06 20:55:44,362 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:55:44,362 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 66 transitions. [2023-11-06 20:55:44,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2023-11-06 20:55:44,362 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:55:44,362 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1] [2023-11-06 20:55:44,374 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-06 20:55:44,563 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:55:44,563 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 15 more)] === [2023-11-06 20:55:44,564 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:55:44,564 INFO L85 PathProgramCache]: Analyzing trace with hash 159278385, now seen corresponding path program 1 times [2023-11-06 20:55:44,564 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:55:44,564 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1707679698] [2023-11-06 20:55:44,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:55:44,564 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:55:44,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:55:44,800 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:55:44,800 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:55:44,800 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1707679698] [2023-11-06 20:55:44,800 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1707679698] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:55:44,800 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [557604560] [2023-11-06 20:55:44,801 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:55:44,801 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:55:44,801 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:55:44,803 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:55:44,831 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-06 20:55:44,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:55:44,864 INFO L262 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 13 conjunts are in the unsatisfiable core [2023-11-06 20:55:44,866 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:55:44,939 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 1 [2023-11-06 20:55:44,943 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-06 20:55:44,946 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2023-11-06 20:55:45,004 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:55:45,005 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:55:45,052 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:55:45,052 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [557604560] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 20:55:45,052 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1642204747] [2023-11-06 20:55:45,056 INFO L159 IcfgInterpreter]: Started Sifa with 4 locations of interest [2023-11-06 20:55:45,056 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:55:45,057 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:55:45,058 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:55:45,058 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 20:55:45,383 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 20:55:45,515 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '509#(and (<= 2 |ULTIMATE.start_main_~#string_A~0#1.base|) (<= 0 (+ 128 |ULTIMATE.start_main_#t~nondet2#1|)) (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_#t~nondet2#1| 127) (= |ULTIMATE.start_main_~#string_B~0#1.offset| 0) (<= |ULTIMATE.start_main_~i~0#1| 4) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= (select |#length| |ULTIMATE.start_main_~#string_A~0#1.base|) |ULTIMATE.start_main_~i~0#1|) (= 0 |ULTIMATE.start_main_~#string_A~0#1.offset|) (<= 2 |ULTIMATE.start_main_~#string_B~0#1.base|) (= |ULTIMATE.start_main_~found~0#1| 0))' at error location [2023-11-06 20:55:45,515 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 20:55:45,516 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 20:55:45,516 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2] total 6 [2023-11-06 20:55:45,516 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1967333833] [2023-11-06 20:55:45,516 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 20:55:45,517 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-06 20:55:45,518 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:55:45,522 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-06 20:55:45,522 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2023-11-06 20:55:45,522 INFO L87 Difference]: Start difference. First operand 51 states and 66 transitions. Second operand has 8 states, 7 states have (on average 2.142857142857143) internal successors, (15), 7 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:55:45,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:55:45,669 INFO L93 Difference]: Finished difference Result 52 states and 65 transitions. [2023-11-06 20:55:45,669 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-06 20:55:45,670 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.142857142857143) internal successors, (15), 7 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2023-11-06 20:55:45,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:55:45,671 INFO L225 Difference]: With dead ends: 52 [2023-11-06 20:55:45,671 INFO L226 Difference]: Without dead ends: 52 [2023-11-06 20:55:45,671 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=40, Invalid=92, Unknown=0, NotChecked=0, Total=132 [2023-11-06 20:55:45,674 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 2 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 80 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 80 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:55:45,675 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 61 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 80 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:55:45,675 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2023-11-06 20:55:45,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2023-11-06 20:55:45,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 38 states have (on average 1.7105263157894737) internal successors, (65), 51 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:55:45,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 65 transitions. [2023-11-06 20:55:45,684 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 65 transitions. Word has length 5 [2023-11-06 20:55:45,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:55:45,685 INFO L495 AbstractCegarLoop]: Abstraction has 52 states and 65 transitions. [2023-11-06 20:55:45,685 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.142857142857143) internal successors, (15), 7 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:55:45,685 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 65 transitions. [2023-11-06 20:55:45,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-11-06 20:55:45,686 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:55:45,686 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 1, 1, 1] [2023-11-06 20:55:45,696 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-06 20:55:45,892 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:55:45,893 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 15 more)] === [2023-11-06 20:55:45,893 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:55:45,893 INFO L85 PathProgramCache]: Analyzing trace with hash -1082958379, now seen corresponding path program 2 times [2023-11-06 20:55:45,894 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:55:45,894 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [53857784] [2023-11-06 20:55:45,894 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:55:45,894 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:55:45,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:55:46,012 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:55:46,012 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:55:46,012 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [53857784] [2023-11-06 20:55:46,013 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [53857784] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:55:46,013 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2035773902] [2023-11-06 20:55:46,013 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-06 20:55:46,013 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:55:46,013 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:55:46,014 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:55:46,040 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-06 20:55:46,078 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 1 check-sat command(s) [2023-11-06 20:55:46,078 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-06 20:55:46,079 INFO L262 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 9 conjunts are in the unsatisfiable core [2023-11-06 20:55:46,081 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:55:46,102 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 1 [2023-11-06 20:55:46,105 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-06 20:55:46,108 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2023-11-06 20:55:46,164 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-11-06 20:55:46,164 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-06 20:55:46,164 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2035773902] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:55:46,164 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-06 20:55:46,164 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [6] total 7 [2023-11-06 20:55:46,165 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [969335421] [2023-11-06 20:55:46,165 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:55:46,166 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-06 20:55:46,166 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:55:46,166 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-06 20:55:46,167 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2023-11-06 20:55:46,167 INFO L87 Difference]: Start difference. First operand 52 states and 65 transitions. Second operand has 3 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:55:46,215 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:55:46,215 INFO L93 Difference]: Finished difference Result 51 states and 64 transitions. [2023-11-06 20:55:46,216 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-06 20:55:46,216 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2023-11-06 20:55:46,216 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:55:46,217 INFO L225 Difference]: With dead ends: 51 [2023-11-06 20:55:46,217 INFO L226 Difference]: Without dead ends: 51 [2023-11-06 20:55:46,217 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2023-11-06 20:55:46,218 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 34 mSDsluCounter, 1 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-06 20:55:46,218 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 20 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-06 20:55:46,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2023-11-06 20:55:46,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2023-11-06 20:55:46,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 38 states have (on average 1.6842105263157894) internal successors, (64), 50 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:55:46,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 64 transitions. [2023-11-06 20:55:46,236 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 64 transitions. Word has length 11 [2023-11-06 20:55:46,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:55:46,237 INFO L495 AbstractCegarLoop]: Abstraction has 51 states and 64 transitions. [2023-11-06 20:55:46,237 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:55:46,237 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 64 transitions. [2023-11-06 20:55:46,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-11-06 20:55:46,239 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:55:46,239 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 1, 1] [2023-11-06 20:55:46,250 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-06 20:55:46,445 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-11-06 20:55:46,446 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 15 more)] === [2023-11-06 20:55:46,446 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:55:46,446 INFO L85 PathProgramCache]: Analyzing trace with hash -1082962697, now seen corresponding path program 2 times [2023-11-06 20:55:46,446 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:55:46,447 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1924550082] [2023-11-06 20:55:46,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:55:46,447 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:55:46,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:55:46,664 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:55:46,664 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:55:46,664 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1924550082] [2023-11-06 20:55:46,664 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1924550082] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:55:46,664 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1665107149] [2023-11-06 20:55:46,664 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-06 20:55:46,665 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:55:46,665 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:55:46,667 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:55:46,702 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-06 20:55:46,738 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-06 20:55:46,739 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-06 20:55:46,740 INFO L262 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 11 conjunts are in the unsatisfiable core [2023-11-06 20:55:46,742 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:55:46,766 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 1 [2023-11-06 20:55:46,769 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-06 20:55:46,772 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2023-11-06 20:55:46,864 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-06 20:55:46,864 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-06 20:55:46,864 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1665107149] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:55:46,865 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-06 20:55:46,865 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 8 [2023-11-06 20:55:46,865 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [163062649] [2023-11-06 20:55:46,865 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:55:46,866 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-06 20:55:46,866 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:55:46,867 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-06 20:55:46,867 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2023-11-06 20:55:46,867 INFO L87 Difference]: Start difference. First operand 51 states and 64 transitions. Second operand has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:55:46,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:55:46,935 INFO L93 Difference]: Finished difference Result 50 states and 63 transitions. [2023-11-06 20:55:46,935 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-06 20:55:46,935 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2023-11-06 20:55:46,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:55:46,939 INFO L225 Difference]: With dead ends: 50 [2023-11-06 20:55:46,939 INFO L226 Difference]: Without dead ends: 50 [2023-11-06 20:55:46,940 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2023-11-06 20:55:46,941 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 34 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 58 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:55:46,941 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 34 Invalid, 58 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:55:46,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2023-11-06 20:55:46,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2023-11-06 20:55:46,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 37 states have (on average 1.6756756756756757) internal successors, (62), 48 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:55:46,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 62 transitions. [2023-11-06 20:55:46,956 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 62 transitions. Word has length 11 [2023-11-06 20:55:46,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:55:46,957 INFO L495 AbstractCegarLoop]: Abstraction has 49 states and 62 transitions. [2023-11-06 20:55:46,957 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:55:46,957 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 62 transitions. [2023-11-06 20:55:46,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-11-06 20:55:46,958 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:55:46,958 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1] [2023-11-06 20:55:46,968 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-11-06 20:55:47,163 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-11-06 20:55:47,164 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr17ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 15 more)] === [2023-11-06 20:55:47,164 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:55:47,164 INFO L85 PathProgramCache]: Analyzing trace with hash -1340917600, now seen corresponding path program 1 times [2023-11-06 20:55:47,164 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:55:47,164 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [828516043] [2023-11-06 20:55:47,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:55:47,164 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:55:47,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:55:47,269 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:55:47,270 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:55:47,270 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [828516043] [2023-11-06 20:55:47,270 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [828516043] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:55:47,270 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [926393303] [2023-11-06 20:55:47,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:55:47,271 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:55:47,271 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:55:47,272 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:55:47,286 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-06 20:55:47,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:55:47,349 INFO L262 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-06 20:55:47,351 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:55:47,374 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:55:47,374 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:55:47,415 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:55:47,415 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [926393303] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 20:55:47,416 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [396287536] [2023-11-06 20:55:47,422 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-06 20:55:47,422 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:55:47,422 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:55:47,422 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:55:47,423 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 20:55:47,680 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 20:55:47,894 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '976#(and (<= 1 |#StackHeapBarrier|) (<= 5 |ULTIMATE.start_main_~i~0#1|) (not (= |ULTIMATE.start_main_old_#valid#1| |#valid|)) (exists ((|v_#valid_56| (Array Int Int)) (|v_ULTIMATE.start_main_~#string_B~0#1.base_32| Int) (|v_ULTIMATE.start_main_~#string_A~0#1.base_32| Int)) (and (not (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#string_A~0#1.base_32|) 4) 0)) (= (select |v_#valid_56| |v_ULTIMATE.start_main_~#string_A~0#1.base_32|) 1) (= (store (store |v_#valid_56| |v_ULTIMATE.start_main_~#string_A~0#1.base_32| 0) |v_ULTIMATE.start_main_~#string_B~0#1.base_32| 0) |#valid|) (<= 2 |v_ULTIMATE.start_main_~#string_B~0#1.base_32|) (<= 5 (select |#length| |v_ULTIMATE.start_main_~#string_A~0#1.base_32|)) (<= 2 |v_ULTIMATE.start_main_~#string_A~0#1.base_32|))) (= |ULTIMATE.start_main_~found~0#1| 0) (= |ULTIMATE.start_main_#res#1| 0))' at error location [2023-11-06 20:55:47,894 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 20:55:47,894 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 20:55:47,894 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 6 [2023-11-06 20:55:47,895 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1007684733] [2023-11-06 20:55:47,895 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 20:55:47,895 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-06 20:55:47,895 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:55:47,896 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-06 20:55:47,896 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2023-11-06 20:55:47,896 INFO L87 Difference]: Start difference. First operand 49 states and 62 transitions. Second operand has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:55:47,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:55:47,990 INFO L93 Difference]: Finished difference Result 74 states and 81 transitions. [2023-11-06 20:55:47,990 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-06 20:55:47,990 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2023-11-06 20:55:47,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:55:47,991 INFO L225 Difference]: With dead ends: 74 [2023-11-06 20:55:47,991 INFO L226 Difference]: Without dead ends: 74 [2023-11-06 20:55:47,992 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 27 SyntacticMatches, 5 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2023-11-06 20:55:47,993 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 67 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 68 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:55:47,994 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [67 Valid, 83 Invalid, 68 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:55:47,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2023-11-06 20:55:48,002 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 53. [2023-11-06 20:55:48,005 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 41 states have (on average 1.6585365853658536) internal successors, (68), 52 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:55:48,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 68 transitions. [2023-11-06 20:55:48,006 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 68 transitions. Word has length 13 [2023-11-06 20:55:48,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:55:48,006 INFO L495 AbstractCegarLoop]: Abstraction has 53 states and 68 transitions. [2023-11-06 20:55:48,007 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:55:48,007 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 68 transitions. [2023-11-06 20:55:48,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-11-06 20:55:48,007 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:55:48,008 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1] [2023-11-06 20:55:48,018 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-11-06 20:55:48,213 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:55:48,213 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr17ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 15 more)] === [2023-11-06 20:55:48,214 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:55:48,214 INFO L85 PathProgramCache]: Analyzing trace with hash 298298466, now seen corresponding path program 2 times [2023-11-06 20:55:48,214 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:55:48,214 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [352374824] [2023-11-06 20:55:48,214 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:55:48,214 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:55:48,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:55:48,382 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-11-06 20:55:48,383 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:55:48,383 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [352374824] [2023-11-06 20:55:48,383 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [352374824] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:55:48,383 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 20:55:48,383 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-06 20:55:48,384 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [661409954] [2023-11-06 20:55:48,384 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:55:48,384 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-06 20:55:48,384 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:55:48,385 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-06 20:55:48,385 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-06 20:55:48,385 INFO L87 Difference]: Start difference. First operand 53 states and 68 transitions. Second operand has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:55:48,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:55:48,456 INFO L93 Difference]: Finished difference Result 52 states and 67 transitions. [2023-11-06 20:55:48,456 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-06 20:55:48,457 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2023-11-06 20:55:48,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:55:48,458 INFO L225 Difference]: With dead ends: 52 [2023-11-06 20:55:48,458 INFO L226 Difference]: Without dead ends: 50 [2023-11-06 20:55:48,458 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-06 20:55:48,459 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 32 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 57 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:55:48,460 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [32 Valid, 28 Invalid, 57 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:55:48,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2023-11-06 20:55:48,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2023-11-06 20:55:48,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 39 states have (on average 1.5897435897435896) internal successors, (62), 49 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:55:48,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 62 transitions. [2023-11-06 20:55:48,463 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 62 transitions. Word has length 15 [2023-11-06 20:55:48,464 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:55:48,464 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 62 transitions. [2023-11-06 20:55:48,464 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:55:48,464 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 62 transitions. [2023-11-06 20:55:48,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-11-06 20:55:48,465 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:55:48,465 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1] [2023-11-06 20:55:48,465 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-11-06 20:55:48,466 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 15 more)] === [2023-11-06 20:55:48,466 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:55:48,466 INFO L85 PathProgramCache]: Analyzing trace with hash 657316744, now seen corresponding path program 1 times [2023-11-06 20:55:48,466 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:55:48,467 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1063655476] [2023-11-06 20:55:48,467 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:55:48,467 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:55:48,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:55:48,518 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-11-06 20:55:48,519 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:55:48,519 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1063655476] [2023-11-06 20:55:48,519 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1063655476] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:55:48,519 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 20:55:48,520 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-11-06 20:55:48,520 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1874240936] [2023-11-06 20:55:48,520 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:55:48,520 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-06 20:55:48,521 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:55:48,521 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-06 20:55:48,521 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-06 20:55:48,522 INFO L87 Difference]: Start difference. First operand 50 states and 62 transitions. Second operand has 3 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:55:48,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:55:48,552 INFO L93 Difference]: Finished difference Result 46 states and 54 transitions. [2023-11-06 20:55:48,552 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-06 20:55:48,552 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 4.0) internal successors, (8), 2 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 16 [2023-11-06 20:55:48,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:55:48,556 INFO L225 Difference]: With dead ends: 46 [2023-11-06 20:55:48,557 INFO L226 Difference]: Without dead ends: 46 [2023-11-06 20:55:48,557 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-06 20:55:48,558 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 25 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 20 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-06 20:55:48,558 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 15 Invalid, 20 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-06 20:55:48,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2023-11-06 20:55:48,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2023-11-06 20:55:48,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 39 states have (on average 1.3846153846153846) internal successors, (54), 45 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:55:48,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 54 transitions. [2023-11-06 20:55:48,561 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 54 transitions. Word has length 16 [2023-11-06 20:55:48,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:55:48,561 INFO L495 AbstractCegarLoop]: Abstraction has 46 states and 54 transitions. [2023-11-06 20:55:48,561 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:55:48,561 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 54 transitions. [2023-11-06 20:55:48,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-11-06 20:55:48,562 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:55:48,562 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1] [2023-11-06 20:55:48,562 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2023-11-06 20:55:48,563 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 15 more)] === [2023-11-06 20:55:48,563 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:55:48,563 INFO L85 PathProgramCache]: Analyzing trace with hash 657316745, now seen corresponding path program 1 times [2023-11-06 20:55:48,563 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:55:48,563 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1367569577] [2023-11-06 20:55:48,563 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:55:48,564 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:55:48,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:55:48,696 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-11-06 20:55:48,697 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:55:48,697 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1367569577] [2023-11-06 20:55:48,697 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1367569577] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:55:48,697 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 20:55:48,697 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-06 20:55:48,698 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1988998785] [2023-11-06 20:55:48,698 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:55:48,698 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-06 20:55:48,698 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:55:48,699 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-06 20:55:48,699 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-06 20:55:48,699 INFO L87 Difference]: Start difference. First operand 46 states and 54 transitions. Second operand has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:55:48,761 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:55:48,761 INFO L93 Difference]: Finished difference Result 54 states and 61 transitions. [2023-11-06 20:55:48,762 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-06 20:55:48,762 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 16 [2023-11-06 20:55:48,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:55:48,763 INFO L225 Difference]: With dead ends: 54 [2023-11-06 20:55:48,763 INFO L226 Difference]: Without dead ends: 54 [2023-11-06 20:55:48,763 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 [2023-11-06 20:55:48,764 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 44 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:55:48,764 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [44 Valid, 18 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:55:48,765 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2023-11-06 20:55:48,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 45. [2023-11-06 20:55:48,767 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 39 states have (on average 1.3333333333333333) internal successors, (52), 44 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:55:48,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 52 transitions. [2023-11-06 20:55:48,767 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 52 transitions. Word has length 16 [2023-11-06 20:55:48,768 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:55:48,768 INFO L495 AbstractCegarLoop]: Abstraction has 45 states and 52 transitions. [2023-11-06 20:55:48,768 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:55:48,768 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 52 transitions. [2023-11-06 20:55:48,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-11-06 20:55:48,769 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:55:48,769 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 2, 1, 1, 1, 1, 1, 1] [2023-11-06 20:55:48,769 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2023-11-06 20:55:48,769 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 15 more)] === [2023-11-06 20:55:48,770 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:55:48,770 INFO L85 PathProgramCache]: Analyzing trace with hash 321296656, now seen corresponding path program 1 times [2023-11-06 20:55:48,770 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:55:48,770 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [319260557] [2023-11-06 20:55:48,771 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:55:48,771 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:55:48,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:55:48,892 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-11-06 20:55:48,892 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:55:48,893 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [319260557] [2023-11-06 20:55:48,893 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [319260557] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:55:48,893 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1039838795] [2023-11-06 20:55:48,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:55:48,893 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:55:48,894 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:55:48,895 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:55:48,926 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-06 20:55:48,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:55:48,985 INFO L262 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 9 conjunts are in the unsatisfiable core [2023-11-06 20:55:48,987 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:55:48,998 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-11-06 20:55:49,097 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-11-06 20:55:49,097 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:55:49,223 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-11-06 20:55:49,223 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1039838795] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 20:55:49,223 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [339986763] [2023-11-06 20:55:49,226 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-11-06 20:55:49,226 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:55:49,227 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:55:49,227 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:55:49,227 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 20:55:49,670 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 20:55:49,958 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1524#(and (<= 2 |ULTIMATE.start_main_~#string_A~0#1.base|) (<= 1 |#StackHeapBarrier|) (<= (select |#length| |ULTIMATE.start_main_~#string_B~0#1.base|) |ULTIMATE.start_main_~i~0#1|) (<= 0 (+ 128 |ULTIMATE.start_main_#t~nondet5#1|)) (= |ULTIMATE.start_main_~#string_B~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= 0 |ULTIMATE.start_main_~#string_A~0#1.offset|) (<= 2 |ULTIMATE.start_main_~#string_B~0#1.base|) (<= |ULTIMATE.start_main_#t~nondet5#1| 127) (= |ULTIMATE.start_main_~found~0#1| 0))' at error location [2023-11-06 20:55:49,958 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 20:55:49,958 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 20:55:49,958 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 7 [2023-11-06 20:55:49,959 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1669290351] [2023-11-06 20:55:49,959 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 20:55:49,959 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-06 20:55:49,959 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:55:49,960 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-06 20:55:49,960 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=162, Unknown=0, NotChecked=0, Total=210 [2023-11-06 20:55:49,960 INFO L87 Difference]: Start difference. First operand 45 states and 52 transitions. Second operand has 9 states, 8 states have (on average 2.875) internal successors, (23), 8 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:55:50,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:55:50,088 INFO L93 Difference]: Finished difference Result 54 states and 58 transitions. [2023-11-06 20:55:50,089 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-06 20:55:50,089 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 2.875) internal successors, (23), 8 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) Word has length 18 [2023-11-06 20:55:50,089 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:55:50,089 INFO L225 Difference]: With dead ends: 54 [2023-11-06 20:55:50,090 INFO L226 Difference]: Without dead ends: 54 [2023-11-06 20:55:50,090 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=66, Invalid=206, Unknown=0, NotChecked=0, Total=272 [2023-11-06 20:55:50,091 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 63 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 84 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 95 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 84 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:55:50,091 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [63 Valid, 28 Invalid, 95 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 84 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:55:50,091 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2023-11-06 20:55:50,092 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 45. [2023-11-06 20:55:50,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 39 states have (on average 1.2564102564102564) internal successors, (49), 44 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:55:50,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 49 transitions. [2023-11-06 20:55:50,093 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 49 transitions. Word has length 18 [2023-11-06 20:55:50,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:55:50,093 INFO L495 AbstractCegarLoop]: Abstraction has 45 states and 49 transitions. [2023-11-06 20:55:50,093 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 2.875) internal successors, (23), 8 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:55:50,093 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 49 transitions. [2023-11-06 20:55:50,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-11-06 20:55:50,095 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:55:50,095 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 4, 1, 1, 1, 1, 1] [2023-11-06 20:55:50,106 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-06 20:55:50,296 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:55:50,296 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 15 more)] === [2023-11-06 20:55:50,297 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:55:50,297 INFO L85 PathProgramCache]: Analyzing trace with hash 1942417189, now seen corresponding path program 2 times [2023-11-06 20:55:50,297 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:55:50,297 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [379792180] [2023-11-06 20:55:50,297 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:55:50,297 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:55:50,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:55:50,514 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-11-06 20:55:50,514 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:55:50,514 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [379792180] [2023-11-06 20:55:50,514 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [379792180] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:55:50,514 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1955288682] [2023-11-06 20:55:50,515 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-06 20:55:50,515 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:55:50,515 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:55:50,516 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:55:50,542 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-06 20:55:50,604 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-06 20:55:50,604 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-06 20:55:50,605 INFO L262 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 7 conjunts are in the unsatisfiable core [2023-11-06 20:55:50,607 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:55:50,618 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 1 [2023-11-06 20:55:50,734 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2023-11-06 20:55:50,734 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-06 20:55:50,734 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1955288682] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:55:50,735 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-06 20:55:50,735 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 9 [2023-11-06 20:55:50,735 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1755760219] [2023-11-06 20:55:50,735 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:55:50,735 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-06 20:55:50,736 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:55:50,736 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-06 20:55:50,736 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2023-11-06 20:55:50,737 INFO L87 Difference]: Start difference. First operand 45 states and 49 transitions. Second operand has 5 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:55:50,792 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:55:50,792 INFO L93 Difference]: Finished difference Result 44 states and 48 transitions. [2023-11-06 20:55:50,793 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-06 20:55:50,793 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 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 24 [2023-11-06 20:55:50,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:55:50,794 INFO L225 Difference]: With dead ends: 44 [2023-11-06 20:55:50,794 INFO L226 Difference]: Without dead ends: 44 [2023-11-06 20:55:50,794 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2023-11-06 20:55:50,795 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 34 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 57 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:55:50,795 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 23 Invalid, 57 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 57 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:55:50,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2023-11-06 20:55:50,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2023-11-06 20:55:50,797 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 39 states have (on average 1.2307692307692308) internal successors, (48), 43 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) [2023-11-06 20:55:50,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 48 transitions. [2023-11-06 20:55:50,797 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 48 transitions. Word has length 24 [2023-11-06 20:55:50,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:55:50,798 INFO L495 AbstractCegarLoop]: Abstraction has 44 states and 48 transitions. [2023-11-06 20:55:50,798 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:55:50,798 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 48 transitions. [2023-11-06 20:55:50,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-11-06 20:55:50,799 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:55:50,799 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:55:50,809 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-06 20:55:51,004 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-11-06 20:55:51,004 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 15 more)] === [2023-11-06 20:55:51,005 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:55:51,005 INFO L85 PathProgramCache]: Analyzing trace with hash 1350957417, now seen corresponding path program 1 times [2023-11-06 20:55:51,005 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:55:51,005 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1095501091] [2023-11-06 20:55:51,005 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:55:51,005 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:55:51,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:55:51,130 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2023-11-06 20:55:51,130 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:55:51,130 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1095501091] [2023-11-06 20:55:51,130 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1095501091] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:55:51,130 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1786451014] [2023-11-06 20:55:51,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:55:51,131 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:55:51,131 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:55:51,132 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:55:51,158 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-06 20:55:51,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:55:51,247 INFO L262 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 10 conjunts are in the unsatisfiable core [2023-11-06 20:55:51,249 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:55:51,417 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 20 proven. 5 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-11-06 20:55:51,417 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:55:51,534 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2023-11-06 20:55:51,654 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 20 proven. 5 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-11-06 20:55:51,654 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1786451014] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 20:55:51,654 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1583786400] [2023-11-06 20:55:51,657 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-11-06 20:55:51,657 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:55:51,657 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:55:51,658 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:55:51,658 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 20:55:52,130 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 20:55:52,539 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1981#(and (<= 2 |ULTIMATE.start_main_~#string_A~0#1.base|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#string_B~0#1.base|) 4) 0) (<= 1 |#StackHeapBarrier|) (<= (select |#length| |ULTIMATE.start_main_~#string_A~0#1.base|) 0) (= (select |#valid| |ULTIMATE.start_main_~#string_B~0#1.base|) 1) (<= 5 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_~#string_B~0#1.offset| 0) (= |ULTIMATE.start_main_~nc_A~0#1| 0) (<= 5 (select |#length| |ULTIMATE.start_main_~#string_B~0#1.base|)) (= 0 |ULTIMATE.start_main_~#string_A~0#1.offset|) (<= 2 |ULTIMATE.start_main_~#string_B~0#1.base|) (= |ULTIMATE.start_main_~found~0#1| 0))' at error location [2023-11-06 20:55:52,539 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 20:55:52,539 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 20:55:52,539 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 7, 7] total 16 [2023-11-06 20:55:52,539 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1194323365] [2023-11-06 20:55:52,539 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 20:55:52,540 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-11-06 20:55:52,540 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:55:52,540 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-11-06 20:55:52,541 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=181, Invalid=469, Unknown=0, NotChecked=0, Total=650 [2023-11-06 20:55:52,541 INFO L87 Difference]: Start difference. First operand 44 states and 48 transitions. Second operand has 18 states, 17 states have (on average 3.1176470588235294) internal successors, (53), 17 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:55:52,870 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:55:52,870 INFO L93 Difference]: Finished difference Result 64 states and 69 transitions. [2023-11-06 20:55:52,871 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-11-06 20:55:52,871 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 3.1176470588235294) internal successors, (53), 17 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2023-11-06 20:55:52,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:55:52,872 INFO L225 Difference]: With dead ends: 64 [2023-11-06 20:55:52,872 INFO L226 Difference]: Without dead ends: 64 [2023-11-06 20:55:52,873 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 326 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=348, Invalid=912, Unknown=0, NotChecked=0, Total=1260 [2023-11-06 20:55:52,873 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 228 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 147 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 228 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 169 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 147 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:55:52,874 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [228 Valid, 31 Invalid, 169 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 147 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:55:52,874 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2023-11-06 20:55:52,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 52. [2023-11-06 20:55:52,876 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 47 states have (on average 1.2553191489361701) internal successors, (59), 51 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:55:52,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 59 transitions. [2023-11-06 20:55:52,876 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 59 transitions. Word has length 28 [2023-11-06 20:55:52,876 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:55:52,876 INFO L495 AbstractCegarLoop]: Abstraction has 52 states and 59 transitions. [2023-11-06 20:55:52,877 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 3.1176470588235294) internal successors, (53), 17 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:55:52,877 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 59 transitions. [2023-11-06 20:55:52,879 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2023-11-06 20:55:52,879 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:55:52,880 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:55:52,886 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-06 20:55:53,080 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2023-11-06 20:55:53,080 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 15 more)] === [2023-11-06 20:55:53,081 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:55:53,081 INFO L85 PathProgramCache]: Analyzing trace with hash -1766118786, now seen corresponding path program 1 times [2023-11-06 20:55:53,081 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:55:53,081 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [173255774] [2023-11-06 20:55:53,081 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:55:53,081 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:55:53,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:55:53,211 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2023-11-06 20:55:53,212 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:55:53,212 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [173255774] [2023-11-06 20:55:53,212 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [173255774] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:55:53,212 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 20:55:53,212 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-06 20:55:53,213 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1124182623] [2023-11-06 20:55:53,213 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:55:53,213 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-06 20:55:53,214 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:55:53,214 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-06 20:55:53,214 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2023-11-06 20:55:53,215 INFO L87 Difference]: Start difference. First operand 52 states and 59 transitions. Second operand has 5 states, 4 states have (on average 3.75) internal successors, (15), 4 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:55:53,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:55:53,270 INFO L93 Difference]: Finished difference Result 68 states and 77 transitions. [2023-11-06 20:55:53,270 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-06 20:55:53,271 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 3.75) internal successors, (15), 4 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 31 [2023-11-06 20:55:53,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:55:53,272 INFO L225 Difference]: With dead ends: 68 [2023-11-06 20:55:53,272 INFO L226 Difference]: Without dead ends: 68 [2023-11-06 20:55:53,272 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2023-11-06 20:55:53,273 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 49 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:55:53,274 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [49 Valid, 19 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:55:53,274 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2023-11-06 20:55:53,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 54. [2023-11-06 20:55:53,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 49 states have (on average 1.2448979591836735) internal successors, (61), 53 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:55:53,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 61 transitions. [2023-11-06 20:55:53,277 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 61 transitions. Word has length 31 [2023-11-06 20:55:53,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:55:53,277 INFO L495 AbstractCegarLoop]: Abstraction has 54 states and 61 transitions. [2023-11-06 20:55:53,278 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 3.75) internal successors, (15), 4 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:55:53,278 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 61 transitions. [2023-11-06 20:55:53,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2023-11-06 20:55:53,279 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:55:53,279 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:55:53,280 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2023-11-06 20:55:53,280 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 15 more)] === [2023-11-06 20:55:53,280 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:55:53,280 INFO L85 PathProgramCache]: Analyzing trace with hash 1084941211, now seen corresponding path program 1 times [2023-11-06 20:55:53,281 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:55:53,281 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [420194265] [2023-11-06 20:55:53,281 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:55:53,281 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:55:53,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:55:53,467 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2023-11-06 20:55:53,467 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:55:53,467 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [420194265] [2023-11-06 20:55:53,467 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [420194265] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:55:53,468 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1686277083] [2023-11-06 20:55:53,468 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:55:53,468 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:55:53,468 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:55:53,469 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:55:53,482 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-06 20:55:53,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:55:53,591 INFO L262 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 14 conjunts are in the unsatisfiable core [2023-11-06 20:55:53,594 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:55:53,839 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 20 proven. 9 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-11-06 20:55:53,839 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:55:54,051 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 18 [2023-11-06 20:55:54,199 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 20 proven. 9 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-11-06 20:55:54,200 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1686277083] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 20:55:54,200 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [120170750] [2023-11-06 20:55:54,203 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-11-06 20:55:54,203 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:55:54,203 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:55:54,204 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:55:54,204 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 20:55:54,670 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 20:55:55,175 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2463#(and (<= 2 |ULTIMATE.start_main_~#string_A~0#1.base|) (<= 1 |#StackHeapBarrier|) (<= 5 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_~#string_B~0#1.offset| 0) (= 0 |ULTIMATE.start_main_~#string_A~0#1.offset|) (<= (select |#length| |ULTIMATE.start_main_~#string_A~0#1.base|) |ULTIMATE.start_main_~nc_A~0#1|) (<= 0 |ULTIMATE.start_main_~nc_A~0#1|) (<= 2 |ULTIMATE.start_main_~#string_B~0#1.base|) (= |ULTIMATE.start_main_~found~0#1| 0))' at error location [2023-11-06 20:55:55,176 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 20:55:55,176 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 20:55:55,176 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 9, 9] total 23 [2023-11-06 20:55:55,176 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [241911042] [2023-11-06 20:55:55,176 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 20:55:55,177 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-11-06 20:55:55,177 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:55:55,178 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-11-06 20:55:55,178 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=248, Invalid=874, Unknown=0, NotChecked=0, Total=1122 [2023-11-06 20:55:55,179 INFO L87 Difference]: Start difference. First operand 54 states and 61 transitions. Second operand has 25 states, 24 states have (on average 2.6666666666666665) internal successors, (64), 24 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:55:56,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:55:56,037 INFO L93 Difference]: Finished difference Result 138 states and 149 transitions. [2023-11-06 20:55:56,038 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2023-11-06 20:55:56,038 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 2.6666666666666665) internal successors, (64), 24 states have internal predecessors, (64), 0 states have call successors, (0), 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 [2023-11-06 20:55:56,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:55:56,039 INFO L225 Difference]: With dead ends: 138 [2023-11-06 20:55:56,040 INFO L226 Difference]: Without dead ends: 138 [2023-11-06 20:55:56,041 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 764 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=622, Invalid=2134, Unknown=0, NotChecked=0, Total=2756 [2023-11-06 20:55:56,042 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 547 mSDsluCounter, 120 mSDsCounter, 0 mSdLazyCounter, 472 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 547 SdHoareTripleChecker+Valid, 140 SdHoareTripleChecker+Invalid, 499 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 472 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-06 20:55:56,042 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [547 Valid, 140 Invalid, 499 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 472 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-06 20:55:56,043 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2023-11-06 20:55:56,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 60. [2023-11-06 20:55:56,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 55 states have (on average 1.2727272727272727) internal successors, (70), 59 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:55:56,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 70 transitions. [2023-11-06 20:55:56,045 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 70 transitions. Word has length 32 [2023-11-06 20:55:56,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:55:56,046 INFO L495 AbstractCegarLoop]: Abstraction has 60 states and 70 transitions. [2023-11-06 20:55:56,046 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 2.6666666666666665) internal successors, (64), 24 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:55:56,046 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 70 transitions. [2023-11-06 20:55:56,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2023-11-06 20:55:56,047 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:55:56,047 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:55:56,058 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-11-06 20:55:56,248 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2023-11-06 20:55:56,248 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 15 more)] === [2023-11-06 20:55:56,249 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:55:56,249 INFO L85 PathProgramCache]: Analyzing trace with hash -728070793, now seen corresponding path program 1 times [2023-11-06 20:55:56,249 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:55:56,249 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [796156367] [2023-11-06 20:55:56,249 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:55:56,249 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:55:56,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:55:56,422 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2023-11-06 20:55:56,422 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:55:56,423 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [796156367] [2023-11-06 20:55:56,423 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [796156367] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:55:56,423 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [31415294] [2023-11-06 20:55:56,423 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:55:56,423 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:55:56,424 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:55:56,427 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:55:56,468 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-11-06 20:55:56,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:55:56,550 INFO L262 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 12 conjunts are in the unsatisfiable core [2023-11-06 20:55:56,553 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:55:56,742 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 20 proven. 6 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-11-06 20:55:56,742 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:55:56,831 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 18 [2023-11-06 20:55:56,991 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 20 proven. 6 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-11-06 20:55:56,991 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [31415294] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 20:55:56,991 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [296185955] [2023-11-06 20:55:56,993 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-06 20:55:56,993 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:55:56,994 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:55:56,994 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:55:56,994 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 20:55:57,456 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 20:55:58,096 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2923#(and (<= 2 |ULTIMATE.start_main_~#string_A~0#1.base|) (<= 1 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_main_~nc_B~0#1|) (<= 5 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_~#string_B~0#1.offset| 0) (= |ULTIMATE.start_main_~nc_A~0#1| 0) (<= (select |#length| |ULTIMATE.start_main_~#string_B~0#1.base|) |ULTIMATE.start_main_~nc_B~0#1|) (= 0 |ULTIMATE.start_main_~#string_A~0#1.offset|) (<= 2 |ULTIMATE.start_main_~#string_B~0#1.base|) (= |ULTIMATE.start_main_~found~0#1| 0))' at error location [2023-11-06 20:55:58,096 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 20:55:58,096 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 20:55:58,096 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 9, 9] total 21 [2023-11-06 20:55:58,096 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [225480612] [2023-11-06 20:55:58,097 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 20:55:58,097 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2023-11-06 20:55:58,097 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:55:58,098 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2023-11-06 20:55:58,099 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=324, Invalid=866, Unknown=0, NotChecked=0, Total=1190 [2023-11-06 20:55:58,099 INFO L87 Difference]: Start difference. First operand 60 states and 70 transitions. Second operand has 23 states, 22 states have (on average 3.0454545454545454) internal successors, (67), 22 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:55:58,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:55:58,645 INFO L93 Difference]: Finished difference Result 180 states and 196 transitions. [2023-11-06 20:55:58,645 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2023-11-06 20:55:58,646 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 3.0454545454545454) internal successors, (67), 22 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 33 [2023-11-06 20:55:58,646 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:55:58,647 INFO L225 Difference]: With dead ends: 180 [2023-11-06 20:55:58,647 INFO L226 Difference]: Without dead ends: 180 [2023-11-06 20:55:58,649 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 914 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=698, Invalid=2164, Unknown=0, NotChecked=0, Total=2862 [2023-11-06 20:55:58,650 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 536 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 260 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 536 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 283 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 260 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-06 20:55:58,650 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [536 Valid, 55 Invalid, 283 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 260 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-06 20:55:58,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2023-11-06 20:55:58,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 72. [2023-11-06 20:55:58,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 67 states have (on average 1.3134328358208955) internal successors, (88), 71 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:55:58,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 88 transitions. [2023-11-06 20:55:58,654 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 88 transitions. Word has length 33 [2023-11-06 20:55:58,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:55:58,654 INFO L495 AbstractCegarLoop]: Abstraction has 72 states and 88 transitions. [2023-11-06 20:55:58,655 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 22 states have (on average 3.0454545454545454) internal successors, (67), 22 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:55:58,655 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 88 transitions. [2023-11-06 20:55:58,655 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2023-11-06 20:55:58,656 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:55:58,656 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:55:58,662 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-11-06 20:55:58,862 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2023-11-06 20:55:58,862 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 15 more)] === [2023-11-06 20:55:58,862 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:55:58,862 INFO L85 PathProgramCache]: Analyzing trace with hash -1478308976, now seen corresponding path program 1 times [2023-11-06 20:55:58,863 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:55:58,863 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [279216977] [2023-11-06 20:55:58,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:55:58,863 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:55:58,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:55:58,936 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2023-11-06 20:55:58,936 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:55:58,937 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [279216977] [2023-11-06 20:55:58,937 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [279216977] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:55:58,937 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 20:55:58,937 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-06 20:55:58,937 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1257782001] [2023-11-06 20:55:58,937 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:55:58,938 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-06 20:55:58,938 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:55:58,939 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-06 20:55:58,939 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-06 20:55:58,939 INFO L87 Difference]: Start difference. First operand 72 states and 88 transitions. Second operand has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:55:58,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:55:58,971 INFO L93 Difference]: Finished difference Result 80 states and 95 transitions. [2023-11-06 20:55:58,971 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-06 20:55:58,971 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 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) Word has length 37 [2023-11-06 20:55:58,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:55:58,974 INFO L225 Difference]: With dead ends: 80 [2023-11-06 20:55:58,974 INFO L226 Difference]: Without dead ends: 80 [2023-11-06 20:55:58,974 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-06 20:55:58,975 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 4 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-06 20:55:58,976 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 50 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-06 20:55:58,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2023-11-06 20:55:58,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 72. [2023-11-06 20:55:58,980 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 67 states have (on average 1.3134328358208955) internal successors, (88), 71 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:55:58,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 88 transitions. [2023-11-06 20:55:58,980 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 88 transitions. Word has length 37 [2023-11-06 20:55:58,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:55:58,981 INFO L495 AbstractCegarLoop]: Abstraction has 72 states and 88 transitions. [2023-11-06 20:55:58,981 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:55:58,981 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 88 transitions. [2023-11-06 20:55:58,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2023-11-06 20:55:58,986 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:55:58,986 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:55:58,986 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2023-11-06 20:55:58,987 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr16ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 15 more)] === [2023-11-06 20:55:58,987 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:55:58,987 INFO L85 PathProgramCache]: Analyzing trace with hash 1307476100, now seen corresponding path program 1 times [2023-11-06 20:55:58,987 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:55:58,988 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2093343050] [2023-11-06 20:55:58,988 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:55:58,988 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:55:59,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:55:59,148 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2023-11-06 20:55:59,149 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:55:59,149 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2093343050] [2023-11-06 20:55:59,149 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2093343050] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:55:59,149 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 20:55:59,149 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-06 20:55:59,149 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [364498711] [2023-11-06 20:55:59,150 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:55:59,151 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-06 20:55:59,151 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:55:59,151 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-06 20:55:59,151 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-06 20:55:59,152 INFO L87 Difference]: Start difference. First operand 72 states and 88 transitions. Second operand has 5 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:55:59,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:55:59,195 INFO L93 Difference]: Finished difference Result 72 states and 87 transitions. [2023-11-06 20:55:59,195 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-06 20:55:59,195 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.2) internal successors, (21), 5 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) Word has length 37 [2023-11-06 20:55:59,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:55:59,196 INFO L225 Difference]: With dead ends: 72 [2023-11-06 20:55:59,196 INFO L226 Difference]: Without dead ends: 66 [2023-11-06 20:55:59,196 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2023-11-06 20:55:59,197 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 3 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-06 20:55:59,197 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 61 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-06 20:55:59,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2023-11-06 20:55:59,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2023-11-06 20:55:59,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 62 states have (on average 1.2419354838709677) internal successors, (77), 65 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:55:59,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 77 transitions. [2023-11-06 20:55:59,200 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 77 transitions. Word has length 37 [2023-11-06 20:55:59,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:55:59,200 INFO L495 AbstractCegarLoop]: Abstraction has 66 states and 77 transitions. [2023-11-06 20:55:59,200 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:55:59,200 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 77 transitions. [2023-11-06 20:55:59,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2023-11-06 20:55:59,201 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:55:59,201 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:55:59,201 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2023-11-06 20:55:59,201 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 15 more)] === [2023-11-06 20:55:59,202 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:55:59,202 INFO L85 PathProgramCache]: Analyzing trace with hash -842701306, now seen corresponding path program 2 times [2023-11-06 20:55:59,202 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:55:59,202 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [36247003] [2023-11-06 20:55:59,202 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:55:59,203 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:55:59,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:55:59,809 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 5 proven. 45 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-11-06 20:55:59,809 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:55:59,809 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [36247003] [2023-11-06 20:55:59,809 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [36247003] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:55:59,809 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1228902913] [2023-11-06 20:55:59,809 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-06 20:55:59,809 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:55:59,810 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:55:59,811 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:55:59,814 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-11-06 20:55:59,942 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2023-11-06 20:55:59,942 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-06 20:55:59,944 INFO L262 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 30 conjunts are in the unsatisfiable core [2023-11-06 20:55:59,950 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:55:59,957 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-11-06 20:55:59,965 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 1 [2023-11-06 20:56:00,082 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 1 [2023-11-06 20:56:00,281 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 13 [2023-11-06 20:56:00,311 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 13 [2023-11-06 20:56:00,344 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 13 [2023-11-06 20:56:00,390 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 13 [2023-11-06 20:56:00,421 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 13 [2023-11-06 20:56:00,618 INFO L322 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-06 20:56:00,618 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 15 [2023-11-06 20:56:00,734 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 9 proven. 14 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2023-11-06 20:56:00,735 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:56:01,246 INFO L322 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-06 20:56:01,252 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 40 treesize of output 39 [2023-11-06 20:56:01,260 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 66 treesize of output 58 [2023-11-06 20:56:01,268 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 3 [2023-11-06 20:56:01,292 INFO L322 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-06 20:56:01,293 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 60 treesize of output 62 [2023-11-06 20:56:01,593 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 23 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2023-11-06 20:56:01,593 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1228902913] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 20:56:01,593 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1528786730] [2023-11-06 20:56:01,596 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-11-06 20:56:01,597 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:56:01,597 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:56:01,597 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:56:01,598 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 20:56:02,060 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 20:56:02,697 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3786#(and (<= 2 |ULTIMATE.start_main_~#string_A~0#1.base|) (<= 1 |#StackHeapBarrier|) (<= 5 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_~#string_B~0#1.offset| 0) (= 0 |ULTIMATE.start_main_~#string_A~0#1.offset|) (<= (select |#length| |ULTIMATE.start_main_~#string_A~0#1.base|) |ULTIMATE.start_main_~nc_A~0#1|) (<= 0 |ULTIMATE.start_main_~nc_A~0#1|) (<= 2 |ULTIMATE.start_main_~#string_B~0#1.base|) (= |ULTIMATE.start_main_~found~0#1| 0))' at error location [2023-11-06 20:56:02,697 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 20:56:02,697 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 20:56:02,697 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 9, 9] total 35 [2023-11-06 20:56:02,697 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1054238944] [2023-11-06 20:56:02,697 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 20:56:02,698 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2023-11-06 20:56:02,698 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:56:02,698 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2023-11-06 20:56:02,700 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=180, Invalid=1799, Unknown=1, NotChecked=0, Total=1980 [2023-11-06 20:56:02,700 INFO L87 Difference]: Start difference. First operand 66 states and 77 transitions. Second operand has 36 states, 36 states have (on average 1.8888888888888888) internal successors, (68), 35 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:56:04,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:56:04,582 INFO L93 Difference]: Finished difference Result 132 states and 150 transitions. [2023-11-06 20:56:04,582 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2023-11-06 20:56:04,582 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.8888888888888888) internal successors, (68), 35 states have internal predecessors, (68), 0 states have call successors, (0), 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 [2023-11-06 20:56:04,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:56:04,583 INFO L225 Difference]: With dead ends: 132 [2023-11-06 20:56:04,584 INFO L226 Difference]: Without dead ends: 132 [2023-11-06 20:56:04,586 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 91 SyntacticMatches, 0 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1353 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=830, Invalid=4869, Unknown=1, NotChecked=0, Total=5700 [2023-11-06 20:56:04,587 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 753 mSDsluCounter, 244 mSDsCounter, 0 mSdLazyCounter, 1045 mSolverCounterSat, 70 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 753 SdHoareTripleChecker+Valid, 263 SdHoareTripleChecker+Invalid, 1115 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 70 IncrementalHoareTripleChecker+Valid, 1045 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-11-06 20:56:04,587 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [753 Valid, 263 Invalid, 1115 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [70 Valid, 1045 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-11-06 20:56:04,588 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2023-11-06 20:56:04,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 66. [2023-11-06 20:56:04,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 63 states have (on average 1.2063492063492063) internal successors, (76), 65 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:56:04,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 76 transitions. [2023-11-06 20:56:04,590 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 76 transitions. Word has length 38 [2023-11-06 20:56:04,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:56:04,591 INFO L495 AbstractCegarLoop]: Abstraction has 66 states and 76 transitions. [2023-11-06 20:56:04,591 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 1.8888888888888888) internal successors, (68), 35 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:56:04,591 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 76 transitions. [2023-11-06 20:56:04,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2023-11-06 20:56:04,592 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:56:04,592 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:56:04,603 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2023-11-06 20:56:04,798 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:56:04,799 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 15 more)] === [2023-11-06 20:56:04,799 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:56:04,799 INFO L85 PathProgramCache]: Analyzing trace with hash -808863518, now seen corresponding path program 2 times [2023-11-06 20:56:04,800 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:56:04,800 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1335965329] [2023-11-06 20:56:04,800 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:56:04,800 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:56:04,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:56:05,051 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2023-11-06 20:56:05,052 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:56:05,052 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1335965329] [2023-11-06 20:56:05,052 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1335965329] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:56:05,052 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [405970515] [2023-11-06 20:56:05,052 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-06 20:56:05,052 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:56:05,055 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:56:05,057 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:56:05,061 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-11-06 20:56:05,190 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-06 20:56:05,191 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-06 20:56:05,193 INFO L262 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 19 conjunts are in the unsatisfiable core [2023-11-06 20:56:05,204 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:56:05,218 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 1 [2023-11-06 20:56:05,529 INFO L322 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-06 20:56:05,529 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 15 [2023-11-06 20:56:05,627 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 9 proven. 7 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2023-11-06 20:56:05,628 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:56:05,784 INFO L322 Elim1Store]: treesize reduction 5, result has 58.3 percent of original size [2023-11-06 20:56:05,785 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 22 treesize of output 15 [2023-11-06 20:56:06,061 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2023-11-06 20:56:06,062 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [405970515] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 20:56:06,062 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2066885756] [2023-11-06 20:56:06,064 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-06 20:56:06,064 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:56:06,064 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:56:06,064 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:56:06,065 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 20:56:06,440 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 20:56:07,193 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4306#(and (<= 2 |ULTIMATE.start_main_~#string_A~0#1.base|) (<= 1 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_main_~nc_B~0#1|) (<= 5 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_~#string_B~0#1.offset| 0) (= |ULTIMATE.start_main_~nc_A~0#1| 0) (<= (select |#length| |ULTIMATE.start_main_~#string_B~0#1.base|) |ULTIMATE.start_main_~nc_B~0#1|) (= 0 |ULTIMATE.start_main_~#string_A~0#1.offset|) (<= 2 |ULTIMATE.start_main_~#string_B~0#1.base|) (= |ULTIMATE.start_main_~found~0#1| 0))' at error location [2023-11-06 20:56:07,193 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 20:56:07,193 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 20:56:07,193 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 21 [2023-11-06 20:56:07,193 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2144017651] [2023-11-06 20:56:07,193 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 20:56:07,194 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2023-11-06 20:56:07,194 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:56:07,195 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2023-11-06 20:56:07,195 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=1016, Unknown=0, NotChecked=0, Total=1190 [2023-11-06 20:56:07,196 INFO L87 Difference]: Start difference. First operand 66 states and 76 transitions. Second operand has 23 states, 22 states have (on average 2.9545454545454546) internal successors, (65), 22 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:56:08,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:56:08,085 INFO L93 Difference]: Finished difference Result 119 states and 127 transitions. [2023-11-06 20:56:08,085 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2023-11-06 20:56:08,085 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 2.9545454545454546) internal successors, (65), 22 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 39 [2023-11-06 20:56:08,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:56:08,086 INFO L225 Difference]: With dead ends: 119 [2023-11-06 20:56:08,087 INFO L226 Difference]: Without dead ends: 108 [2023-11-06 20:56:08,088 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 89 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 706 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=488, Invalid=2268, Unknown=0, NotChecked=0, Total=2756 [2023-11-06 20:56:08,089 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 374 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 376 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 374 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 394 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 376 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-06 20:56:08,090 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [374 Valid, 54 Invalid, 394 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 376 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-06 20:56:08,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2023-11-06 20:56:08,092 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 56. [2023-11-06 20:56:08,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 54 states have (on average 1.1851851851851851) internal successors, (64), 55 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:56:08,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 64 transitions. [2023-11-06 20:56:08,093 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 64 transitions. Word has length 39 [2023-11-06 20:56:08,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:56:08,094 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 64 transitions. [2023-11-06 20:56:08,094 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 22 states have (on average 2.9545454545454546) internal successors, (65), 22 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:56:08,094 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 64 transitions. [2023-11-06 20:56:08,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2023-11-06 20:56:08,095 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:56:08,095 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:56:08,102 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2023-11-06 20:56:08,300 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2023-11-06 20:56:08,301 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 15 more)] === [2023-11-06 20:56:08,301 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:56:08,301 INFO L85 PathProgramCache]: Analyzing trace with hash 1619711232, now seen corresponding path program 1 times [2023-11-06 20:56:08,301 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:56:08,301 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [109947213] [2023-11-06 20:56:08,301 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:56:08,301 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:56:08,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:56:08,418 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2023-11-06 20:56:08,418 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:56:08,419 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [109947213] [2023-11-06 20:56:08,419 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [109947213] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:56:08,419 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 20:56:08,419 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-06 20:56:08,419 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1887859403] [2023-11-06 20:56:08,419 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:56:08,420 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-06 20:56:08,420 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:56:08,420 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-06 20:56:08,421 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2023-11-06 20:56:08,421 INFO L87 Difference]: Start difference. First operand 56 states and 64 transitions. Second operand has 5 states, 4 states have (on average 5.5) internal successors, (22), 4 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:56:08,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:56:08,458 INFO L93 Difference]: Finished difference Result 57 states and 65 transitions. [2023-11-06 20:56:08,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-06 20:56:08,459 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 5.5) internal successors, (22), 4 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) Word has length 40 [2023-11-06 20:56:08,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:56:08,460 INFO L225 Difference]: With dead ends: 57 [2023-11-06 20:56:08,460 INFO L226 Difference]: Without dead ends: 57 [2023-11-06 20:56:08,460 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2023-11-06 20:56:08,461 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 20 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 29 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-06 20:56:08,462 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 19 Invalid, 29 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-06 20:56:08,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2023-11-06 20:56:08,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2023-11-06 20:56:08,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 55 states have (on average 1.1818181818181819) internal successors, (65), 56 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:56:08,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 65 transitions. [2023-11-06 20:56:08,464 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 65 transitions. Word has length 40 [2023-11-06 20:56:08,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:56:08,465 INFO L495 AbstractCegarLoop]: Abstraction has 57 states and 65 transitions. [2023-11-06 20:56:08,465 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 5.5) internal successors, (22), 4 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:56:08,465 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 65 transitions. [2023-11-06 20:56:08,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2023-11-06 20:56:08,466 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:56:08,466 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:56:08,466 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2023-11-06 20:56:08,467 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 15 more)] === [2023-11-06 20:56:08,467 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:56:08,467 INFO L85 PathProgramCache]: Analyzing trace with hash 1764378191, now seen corresponding path program 1 times [2023-11-06 20:56:08,467 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:56:08,468 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [496046839] [2023-11-06 20:56:08,468 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:56:08,468 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:56:08,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:56:08,668 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2023-11-06 20:56:08,668 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:56:08,669 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [496046839] [2023-11-06 20:56:08,669 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [496046839] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:56:08,669 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [963410729] [2023-11-06 20:56:08,669 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:56:08,669 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:56:08,670 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:56:08,671 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:56:08,702 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6db534b-3e62-4e29-8866-e6df99370211/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-11-06 20:56:08,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:56:08,811 INFO L262 TraceCheckSpWp]: Trace formula consists of 253 conjuncts, 14 conjunts are in the unsatisfiable core [2023-11-06 20:56:08,813 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:56:09,137 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 48 treesize of output 36 [2023-11-06 20:56:09,185 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 21 proven. 8 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2023-11-06 20:56:09,186 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:56:09,257 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 54 treesize of output 42