./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/termination-memory-alloca/openbsd_cstrspn-alloca-1.i --full-output --architecture 64bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 0e0057cc Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/termination-memory-alloca/openbsd_cstrspn-alloca-1.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-DerefFreeMemtrack-64bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 64bit --witnessprinter.graph.data.programhash e3b4fa4839d843c17aca38b087d008ecb7fb2a74ec53840f4a61df0dde2a3794 --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-12-02 14:29:11,281 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-12-02 14:29:11,345 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-DerefFreeMemtrack-64bit-Taipan_Default.epf [2023-12-02 14:29:11,351 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-12-02 14:29:11,351 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-12-02 14:29:11,376 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-12-02 14:29:11,376 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-12-02 14:29:11,377 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-12-02 14:29:11,377 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-12-02 14:29:11,378 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-12-02 14:29:11,378 INFO L153 SettingsManager]: * User list type=DISABLED [2023-12-02 14:29:11,379 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-12-02 14:29:11,380 INFO L153 SettingsManager]: * Explicit value domain=true [2023-12-02 14:29:11,380 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-12-02 14:29:11,381 INFO L153 SettingsManager]: * Octagon Domain=false [2023-12-02 14:29:11,381 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-12-02 14:29:11,382 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-12-02 14:29:11,382 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-12-02 14:29:11,383 INFO L153 SettingsManager]: * Interval Domain=false [2023-12-02 14:29:11,383 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-12-02 14:29:11,384 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-12-02 14:29:11,385 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-12-02 14:29:11,385 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-12-02 14:29:11,386 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-12-02 14:29:11,386 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-12-02 14:29:11,387 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-12-02 14:29:11,387 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-12-02 14:29:11,388 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-12-02 14:29:11,388 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2023-12-02 14:29:11,389 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-12-02 14:29:11,389 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-12-02 14:29:11,390 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-12-02 14:29:11,390 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-12-02 14:29:11,390 INFO L153 SettingsManager]: * Use constant arrays=true [2023-12-02 14:29:11,391 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-12-02 14:29:11,391 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-12-02 14:29:11,391 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-12-02 14:29:11,391 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 14:29:11,391 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-12-02 14:29:11,392 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-12-02 14:29:11,392 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-12-02 14:29:11,392 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-12-02 14:29:11,392 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-12-02 14:29:11,393 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-12-02 14:29:11,393 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-12-02 14:29:11,393 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_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> e3b4fa4839d843c17aca38b087d008ecb7fb2a74ec53840f4a61df0dde2a3794 [2023-12-02 14:29:11,592 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-12-02 14:29:11,614 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-12-02 14:29:11,617 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-12-02 14:29:11,618 INFO L270 PluginConnector]: Initializing CDTParser... [2023-12-02 14:29:11,619 INFO L274 PluginConnector]: CDTParser initialized [2023-12-02 14:29:11,620 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/../../sv-benchmarks/c/termination-memory-alloca/openbsd_cstrspn-alloca-1.i [2023-12-02 14:29:14,382 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-12-02 14:29:14,621 INFO L384 CDTParser]: Found 1 translation units. [2023-12-02 14:29:14,622 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/sv-benchmarks/c/termination-memory-alloca/openbsd_cstrspn-alloca-1.i [2023-12-02 14:29:14,636 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/data/240c9639b/43317ca1d2924b82a677351c9703a06e/FLAG99a0bf794 [2023-12-02 14:29:14,649 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/data/240c9639b/43317ca1d2924b82a677351c9703a06e [2023-12-02 14:29:14,652 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-12-02 14:29:14,653 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-12-02 14:29:14,655 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-12-02 14:29:14,655 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-12-02 14:29:14,659 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-12-02 14:29:14,660 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 02:29:14" (1/1) ... [2023-12-02 14:29:14,660 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@694a16b4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:29:14, skipping insertion in model container [2023-12-02 14:29:14,661 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 02:29:14" (1/1) ... [2023-12-02 14:29:14,697 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-02 14:29:14,922 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 14:29:14,932 INFO L202 MainTranslator]: Completed pre-run [2023-12-02 14:29:14,966 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 14:29:14,987 INFO L206 MainTranslator]: Completed translation [2023-12-02 14:29:14,987 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:29:14 WrapperNode [2023-12-02 14:29:14,987 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-12-02 14:29:14,988 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-12-02 14:29:14,988 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-12-02 14:29:14,989 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-12-02 14:29:14,994 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:29:14" (1/1) ... [2023-12-02 14:29:15,005 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:29:14" (1/1) ... [2023-12-02 14:29:15,022 INFO L138 Inliner]: procedures = 111, calls = 13, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 64 [2023-12-02 14:29:15,022 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-12-02 14:29:15,023 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-12-02 14:29:15,023 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-12-02 14:29:15,023 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-12-02 14:29:15,030 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:29:14" (1/1) ... [2023-12-02 14:29:15,030 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:29:14" (1/1) ... [2023-12-02 14:29:15,033 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:29:14" (1/1) ... [2023-12-02 14:29:15,034 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:29:14" (1/1) ... [2023-12-02 14:29:15,040 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:29:14" (1/1) ... [2023-12-02 14:29:15,043 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:29:14" (1/1) ... [2023-12-02 14:29:15,045 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:29:14" (1/1) ... [2023-12-02 14:29:15,046 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:29:14" (1/1) ... [2023-12-02 14:29:15,049 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-12-02 14:29:15,050 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-12-02 14:29:15,050 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-12-02 14:29:15,050 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-12-02 14:29:15,051 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:29:14" (1/1) ... [2023-12-02 14:29:15,057 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 14:29:15,071 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:29:15,084 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-12-02 14:29:15,088 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-12-02 14:29:15,114 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-12-02 14:29:15,115 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-12-02 14:29:15,115 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-12-02 14:29:15,115 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-12-02 14:29:15,115 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-12-02 14:29:15,115 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-12-02 14:29:15,219 INFO L241 CfgBuilder]: Building ICFG [2023-12-02 14:29:15,221 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-12-02 14:29:15,372 INFO L282 CfgBuilder]: Performing block encoding [2023-12-02 14:29:15,427 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-12-02 14:29:15,427 INFO L309 CfgBuilder]: Removed 1 assume(true) statements. [2023-12-02 14:29:15,429 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 02:29:15 BoogieIcfgContainer [2023-12-02 14:29:15,429 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-12-02 14:29:15,432 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-12-02 14:29:15,432 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-12-02 14:29:15,435 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-12-02 14:29:15,435 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 02:29:14" (1/3) ... [2023-12-02 14:29:15,436 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@14740820 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 02:29:15, skipping insertion in model container [2023-12-02 14:29:15,436 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:29:14" (2/3) ... [2023-12-02 14:29:15,437 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@14740820 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 02:29:15, skipping insertion in model container [2023-12-02 14:29:15,437 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 02:29:15" (3/3) ... [2023-12-02 14:29:15,438 INFO L112 eAbstractionObserver]: Analyzing ICFG openbsd_cstrspn-alloca-1.i [2023-12-02 14:29:15,457 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-12-02 14:29:15,458 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 9 error locations. [2023-12-02 14:29:15,502 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-12-02 14:29:15,509 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;@2464859, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-12-02 14:29:15,510 INFO L358 AbstractCegarLoop]: Starting to check reachability of 9 error locations. [2023-12-02 14:29:15,514 INFO L276 IsEmpty]: Start isEmpty. Operand has 21 states, 11 states have (on average 2.090909090909091) internal successors, (23), 20 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) [2023-12-02 14:29:15,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3 [2023-12-02 14:29:15,519 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:29:15,520 INFO L195 NwaCegarLoop]: trace histogram [1, 1] [2023-12-02 14:29:15,520 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 6 more)] === [2023-12-02 14:29:15,525 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:29:15,526 INFO L85 PathProgramCache]: Analyzing trace with hash 3086, now seen corresponding path program 1 times [2023-12-02 14:29:15,535 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:29:15,536 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1152654316] [2023-12-02 14:29:15,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:29:15,537 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:29:15,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:29:15,819 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:29:15,820 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:29:15,820 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1152654316] [2023-12-02 14:29:15,821 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1152654316] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:29:15,821 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 14:29:15,821 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-12-02 14:29:15,823 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1334622227] [2023-12-02 14:29:15,824 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:29:15,828 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 14:29:15,828 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:29:15,858 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 14:29:15,858 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 14:29:15,860 INFO L87 Difference]: Start difference. First operand has 21 states, 11 states have (on average 2.090909090909091) internal successors, (23), 20 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) Second operand has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:29:15,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:29:15,897 INFO L93 Difference]: Finished difference Result 20 states and 21 transitions. [2023-12-02 14:29:15,898 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 14:29:15,899 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 2 [2023-12-02 14:29:15,899 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:29:15,905 INFO L225 Difference]: With dead ends: 20 [2023-12-02 14:29:15,905 INFO L226 Difference]: Without dead ends: 19 [2023-12-02 14:29:15,906 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 14:29:15,910 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 17 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 14:29:15,911 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 10 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 14:29:15,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2023-12-02 14:29:15,932 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2023-12-02 14:29:15,933 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 18 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) [2023-12-02 14:29:15,933 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2023-12-02 14:29:15,934 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 2 [2023-12-02 14:29:15,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:29:15,935 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2023-12-02 14:29:15,935 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:29:15,935 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2023-12-02 14:29:15,935 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3 [2023-12-02 14:29:15,935 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:29:15,936 INFO L195 NwaCegarLoop]: trace histogram [1, 1] [2023-12-02 14:29:15,936 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-12-02 14:29:15,936 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 6 more)] === [2023-12-02 14:29:15,937 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:29:15,937 INFO L85 PathProgramCache]: Analyzing trace with hash 3087, now seen corresponding path program 1 times [2023-12-02 14:29:15,937 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:29:15,938 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [205170493] [2023-12-02 14:29:15,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:29:15,938 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:29:15,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:29:16,184 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:29:16,184 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:29:16,185 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [205170493] [2023-12-02 14:29:16,185 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [205170493] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:29:16,185 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 14:29:16,185 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-12-02 14:29:16,186 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [29077650] [2023-12-02 14:29:16,186 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:29:16,187 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 14:29:16,187 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:29:16,188 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 14:29:16,188 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 14:29:16,188 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:29:16,211 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:29:16,212 INFO L93 Difference]: Finished difference Result 18 states and 19 transitions. [2023-12-02 14:29:16,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 14:29:16,212 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 2 [2023-12-02 14:29:16,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:29:16,213 INFO L225 Difference]: With dead ends: 18 [2023-12-02 14:29:16,213 INFO L226 Difference]: Without dead ends: 18 [2023-12-02 14:29:16,214 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 14:29:16,215 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 18 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 14:29:16,216 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 10 Invalid, 9 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 14:29:16,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2023-12-02 14:29:16,219 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2023-12-02 14:29:16,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 17 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:29:16,220 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2023-12-02 14:29:16,220 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 2 [2023-12-02 14:29:16,220 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:29:16,220 INFO L495 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2023-12-02 14:29:16,221 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:29:16,221 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2023-12-02 14:29:16,221 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2023-12-02 14:29:16,221 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:29:16,221 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2023-12-02 14:29:16,222 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-12-02 14:29:16,222 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 6 more)] === [2023-12-02 14:29:16,223 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:29:16,223 INFO L85 PathProgramCache]: Analyzing trace with hash 95655, now seen corresponding path program 1 times [2023-12-02 14:29:16,223 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:29:16,223 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1229838570] [2023-12-02 14:29:16,223 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:29:16,224 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:29:16,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:29:16,343 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:29:16,344 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:29:16,344 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1229838570] [2023-12-02 14:29:16,344 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1229838570] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:29:16,344 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 14:29:16,345 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-12-02 14:29:16,345 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1055818795] [2023-12-02 14:29:16,345 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:29:16,345 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 14:29:16,346 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:29:16,346 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 14:29:16,347 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 14:29:16,347 INFO L87 Difference]: Start difference. First operand 18 states and 19 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) [2023-12-02 14:29:16,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:29:16,368 INFO L93 Difference]: Finished difference Result 17 states and 18 transitions. [2023-12-02 14:29:16,368 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 14:29:16,368 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2023-12-02 14:29:16,369 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:29:16,369 INFO L225 Difference]: With dead ends: 17 [2023-12-02 14:29:16,369 INFO L226 Difference]: Without dead ends: 17 [2023-12-02 14:29:16,370 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 14:29:16,371 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 14 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 14:29:16,372 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 9 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 14:29:16,373 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2023-12-02 14:29:16,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2023-12-02 14:29:16,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 11 states have (on average 1.6363636363636365) internal successors, (18), 16 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:29:16,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2023-12-02 14:29:16,376 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 3 [2023-12-02 14:29:16,376 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:29:16,377 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2023-12-02 14:29:16,377 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:29:16,377 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2023-12-02 14:29:16,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2023-12-02 14:29:16,377 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:29:16,378 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2023-12-02 14:29:16,378 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-12-02 14:29:16,378 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 6 more)] === [2023-12-02 14:29:16,379 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:29:16,379 INFO L85 PathProgramCache]: Analyzing trace with hash 95656, now seen corresponding path program 1 times [2023-12-02 14:29:16,379 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:29:16,379 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1123135939] [2023-12-02 14:29:16,380 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:29:16,380 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:29:16,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:29:16,547 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:29:16,548 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:29:16,548 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1123135939] [2023-12-02 14:29:16,548 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1123135939] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:29:16,548 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 14:29:16,548 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-12-02 14:29:16,549 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1209297387] [2023-12-02 14:29:16,549 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:29:16,549 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 14:29:16,549 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:29:16,550 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 14:29:16,550 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 14:29:16,550 INFO L87 Difference]: Start difference. First operand 17 states and 18 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) [2023-12-02 14:29:16,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:29:16,570 INFO L93 Difference]: Finished difference Result 16 states and 17 transitions. [2023-12-02 14:29:16,570 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 14:29:16,571 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2023-12-02 14:29:16,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:29:16,571 INFO L225 Difference]: With dead ends: 16 [2023-12-02 14:29:16,571 INFO L226 Difference]: Without dead ends: 16 [2023-12-02 14:29:16,572 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 14:29:16,573 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 15 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 8 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 8 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 8 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 14:29:16,574 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 9 Invalid, 8 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 8 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 14:29:16,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2023-12-02 14:29:16,576 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2023-12-02 14:29:16,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 15 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:29:16,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2023-12-02 14:29:16,577 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 3 [2023-12-02 14:29:16,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:29:16,578 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2023-12-02 14:29:16,578 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:29:16,578 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2023-12-02 14:29:16,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2023-12-02 14:29:16,578 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:29:16,579 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2023-12-02 14:29:16,579 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-12-02 14:29:16,579 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 6 more)] === [2023-12-02 14:29:16,580 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:29:16,580 INFO L85 PathProgramCache]: Analyzing trace with hash 91965587, now seen corresponding path program 1 times [2023-12-02 14:29:16,580 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:29:16,580 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [75546068] [2023-12-02 14:29:16,580 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:29:16,581 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:29:16,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:29:16,652 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:29:16,653 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:29:16,653 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [75546068] [2023-12-02 14:29:16,653 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [75546068] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:29:16,653 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 14:29:16,653 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-12-02 14:29:16,654 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [797451148] [2023-12-02 14:29:16,654 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:29:16,654 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 14:29:16,654 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:29:16,655 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 14:29:16,655 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-12-02 14:29:16,656 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand has 5 states, 4 states have (on average 1.25) internal successors, (5), 5 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:29:16,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:29:16,702 INFO L93 Difference]: Finished difference Result 15 states and 16 transitions. [2023-12-02 14:29:16,702 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 14:29:16,702 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.25) internal successors, (5), 5 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2023-12-02 14:29:16,702 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:29:16,703 INFO L225 Difference]: With dead ends: 15 [2023-12-02 14:29:16,703 INFO L226 Difference]: Without dead ends: 15 [2023-12-02 14:29:16,703 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2023-12-02 14:29:16,705 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 23 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 14:29:16,705 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 13 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 14:29:16,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2023-12-02 14:29:16,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2023-12-02 14:29:16,707 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 14 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:29:16,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2023-12-02 14:29:16,708 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 5 [2023-12-02 14:29:16,708 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:29:16,708 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2023-12-02 14:29:16,708 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.25) internal successors, (5), 5 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:29:16,709 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2023-12-02 14:29:16,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2023-12-02 14:29:16,709 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:29:16,709 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2023-12-02 14:29:16,709 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-12-02 14:29:16,710 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 6 more)] === [2023-12-02 14:29:16,710 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:29:16,710 INFO L85 PathProgramCache]: Analyzing trace with hash 91965588, now seen corresponding path program 1 times [2023-12-02 14:29:16,710 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:29:16,710 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1252587618] [2023-12-02 14:29:16,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:29:16,711 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:29:16,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:29:16,844 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:29:16,845 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:29:16,845 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1252587618] [2023-12-02 14:29:16,845 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1252587618] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:29:16,845 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 14:29:16,845 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-12-02 14:29:16,846 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1139151836] [2023-12-02 14:29:16,846 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:29:16,846 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 14:29:16,846 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:29:16,847 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 14:29:16,847 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 14:29:16,847 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand has 6 states, 5 states have (on average 1.0) internal successors, (5), 5 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:29:16,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:29:16,917 INFO L93 Difference]: Finished difference Result 17 states and 18 transitions. [2023-12-02 14:29:16,917 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 14:29:16,917 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 1.0) internal successors, (5), 5 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2023-12-02 14:29:16,918 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:29:16,918 INFO L225 Difference]: With dead ends: 17 [2023-12-02 14:29:16,918 INFO L226 Difference]: Without dead ends: 17 [2023-12-02 14:29:16,919 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=47, Unknown=0, NotChecked=0, Total=72 [2023-12-02 14:29:16,920 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 33 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 14:29:16,920 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [33 Valid, 21 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 14:29:16,921 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2023-12-02 14:29:16,923 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2023-12-02 14:29:16,923 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 16 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:29:16,923 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2023-12-02 14:29:16,923 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 5 [2023-12-02 14:29:16,924 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:29:16,924 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2023-12-02 14:29:16,924 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 1.0) internal successors, (5), 5 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:29:16,924 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2023-12-02 14:29:16,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-12-02 14:29:16,924 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:29:16,925 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:29:16,925 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-12-02 14:29:16,925 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 6 more)] === [2023-12-02 14:29:16,925 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:29:16,925 INFO L85 PathProgramCache]: Analyzing trace with hash -1815350409, now seen corresponding path program 1 times [2023-12-02 14:29:16,925 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:29:16,926 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [292426926] [2023-12-02 14:29:16,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:29:16,926 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:29:16,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:29:17,023 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:29:17,023 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:29:17,024 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [292426926] [2023-12-02 14:29:17,024 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [292426926] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:29:17,024 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 14:29:17,025 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-12-02 14:29:17,025 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1965530077] [2023-12-02 14:29:17,025 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:29:17,025 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 14:29:17,025 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:29:17,026 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 14:29:17,027 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-12-02 14:29:17,027 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand has 5 states, 4 states have (on average 1.75) internal successors, (7), 5 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) [2023-12-02 14:29:17,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:29:17,086 INFO L93 Difference]: Finished difference Result 16 states and 17 transitions. [2023-12-02 14:29:17,086 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 14:29:17,086 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 5 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2023-12-02 14:29:17,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:29:17,087 INFO L225 Difference]: With dead ends: 16 [2023-12-02 14:29:17,087 INFO L226 Difference]: Without dead ends: 16 [2023-12-02 14:29:17,087 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2023-12-02 14:29:17,088 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 19 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 14:29:17,088 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 15 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 14:29:17,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2023-12-02 14:29:17,090 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2023-12-02 14:29:17,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 15 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:29:17,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2023-12-02 14:29:17,091 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 7 [2023-12-02 14:29:17,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:29:17,091 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2023-12-02 14:29:17,091 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 5 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) [2023-12-02 14:29:17,091 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2023-12-02 14:29:17,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-12-02 14:29:17,092 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:29:17,092 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:29:17,092 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-12-02 14:29:17,092 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 6 more)] === [2023-12-02 14:29:17,093 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:29:17,093 INFO L85 PathProgramCache]: Analyzing trace with hash -1815350408, now seen corresponding path program 1 times [2023-12-02 14:29:17,093 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:29:17,093 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [517265302] [2023-12-02 14:29:17,093 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:29:17,093 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:29:17,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:29:17,261 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:29:17,261 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:29:17,261 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [517265302] [2023-12-02 14:29:17,261 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [517265302] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:29:17,261 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 14:29:17,261 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-12-02 14:29:17,262 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1693220762] [2023-12-02 14:29:17,262 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:29:17,262 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 14:29:17,262 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:29:17,263 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 14:29:17,263 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 14:29:17,263 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand has 6 states, 5 states have (on average 1.4) internal successors, (7), 5 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) [2023-12-02 14:29:17,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:29:17,366 INFO L93 Difference]: Finished difference Result 19 states and 21 transitions. [2023-12-02 14:29:17,366 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 14:29:17,366 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 1.4) internal successors, (7), 5 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2023-12-02 14:29:17,366 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:29:17,367 INFO L225 Difference]: With dead ends: 19 [2023-12-02 14:29:17,367 INFO L226 Difference]: Without dead ends: 19 [2023-12-02 14:29:17,367 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=47, Unknown=0, NotChecked=0, Total=72 [2023-12-02 14:29:17,368 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 31 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 14:29:17,368 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 17 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 14:29:17,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2023-12-02 14:29:17,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 18. [2023-12-02 14:29:17,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 17 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:29:17,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2023-12-02 14:29:17,371 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 7 [2023-12-02 14:29:17,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:29:17,371 INFO L495 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2023-12-02 14:29:17,372 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 1.4) internal successors, (7), 5 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) [2023-12-02 14:29:17,372 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2023-12-02 14:29:17,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-12-02 14:29:17,372 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:29:17,372 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:29:17,372 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-12-02 14:29:17,373 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr8ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 6 more)] === [2023-12-02 14:29:17,373 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:29:17,373 INFO L85 PathProgramCache]: Analyzing trace with hash 1125000557, now seen corresponding path program 1 times [2023-12-02 14:29:17,373 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:29:17,373 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [428045501] [2023-12-02 14:29:17,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:29:17,374 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:29:17,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:29:17,539 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:29:17,539 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:29:17,539 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [428045501] [2023-12-02 14:29:17,539 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [428045501] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:29:17,539 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 14:29:17,539 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-12-02 14:29:17,540 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [932971890] [2023-12-02 14:29:17,540 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:29:17,540 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 14:29:17,540 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:29:17,541 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 14:29:17,541 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 14:29:17,541 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:29:17,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:29:17,557 INFO L93 Difference]: Finished difference Result 17 states and 18 transitions. [2023-12-02 14:29:17,557 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 14:29:17,557 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2023-12-02 14:29:17,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:29:17,558 INFO L225 Difference]: With dead ends: 17 [2023-12-02 14:29:17,558 INFO L226 Difference]: Without dead ends: 15 [2023-12-02 14:29:17,558 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 14:29:17,559 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 5 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 14:29:17,559 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 16 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 14:29:17,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2023-12-02 14:29:17,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2023-12-02 14:29:17,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 14 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:29:17,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2023-12-02 14:29:17,561 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 10 [2023-12-02 14:29:17,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:29:17,562 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2023-12-02 14:29:17,562 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:29:17,562 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2023-12-02 14:29:17,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-12-02 14:29:17,562 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:29:17,563 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:29:17,563 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-12-02 14:29:17,563 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 6 more)] === [2023-12-02 14:29:17,563 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:29:17,563 INFO L85 PathProgramCache]: Analyzing trace with hash 515319288, now seen corresponding path program 1 times [2023-12-02 14:29:17,563 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:29:17,564 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1555573275] [2023-12-02 14:29:17,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:29:17,564 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:29:17,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:29:18,078 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:29:18,078 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:29:18,079 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1555573275] [2023-12-02 14:29:18,079 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1555573275] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:29:18,079 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1332138651] [2023-12-02 14:29:18,079 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:29:18,079 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:29:18,079 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:29:18,083 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:29:18,084 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-12-02 14:29:18,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:29:18,170 INFO L262 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 42 conjunts are in the unsatisfiable core [2023-12-02 14:29:18,177 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:29:18,234 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-12-02 14:29:18,269 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2023-12-02 14:29:18,360 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 14 [2023-12-02 14:29:18,533 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 14:29:18,533 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 17 [2023-12-02 14:29:18,732 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:29:18,732 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:29:19,167 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 14:29:19,168 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 22 [2023-12-02 14:29:19,182 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 14:29:19,182 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 34 [2023-12-02 14:29:19,195 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2023-12-02 14:29:19,205 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2023-12-02 14:29:19,279 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:29:19,280 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1332138651] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:29:19,280 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [510240085] [2023-12-02 14:29:19,298 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-12-02 14:29:19,298 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:29:19,302 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:29:19,308 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:29:19,308 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:29:21,571 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:29:23,172 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '474#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (= |ULTIMATE.start_cstrspn_#t~post2#1.base| |ULTIMATE.start_cstrspn_~p~0#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#t~post2#1.offset|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#t~post2#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (= |ULTIMATE.start_cstrspn_~p~0#1.offset| (+ |ULTIMATE.start_cstrspn_#t~post2#1.offset| 1)) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= (select |#length| |ULTIMATE.start_cstrspn_#t~post2#1.base|) |ULTIMATE.start_cstrspn_#t~post2#1.offset|))' at error location [2023-12-02 14:29:23,172 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 14:29:23,172 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:29:23,172 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 24 [2023-12-02 14:29:23,173 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [818390968] [2023-12-02 14:29:23,173 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:29:23,173 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2023-12-02 14:29:23,173 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:29:23,174 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2023-12-02 14:29:23,174 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=1062, Unknown=2, NotChecked=0, Total=1190 [2023-12-02 14:29:23,174 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand has 26 states, 25 states have (on average 1.32) internal successors, (33), 25 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:29:23,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:29:23,522 INFO L93 Difference]: Finished difference Result 24 states and 26 transitions. [2023-12-02 14:29:23,522 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-12-02 14:29:23,522 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 1.32) internal successors, (33), 25 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2023-12-02 14:29:23,523 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:29:23,523 INFO L225 Difference]: With dead ends: 24 [2023-12-02 14:29:23,523 INFO L226 Difference]: Without dead ends: 24 [2023-12-02 14:29:23,524 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 436 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=216, Invalid=1504, Unknown=2, NotChecked=0, Total=1722 [2023-12-02 14:29:23,524 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 34 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 128 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 130 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 128 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 14:29:23,524 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 30 Invalid, 130 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 128 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 14:29:23,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2023-12-02 14:29:23,526 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2023-12-02 14:29:23,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 21 states have (on average 1.2380952380952381) internal successors, (26), 22 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:29:23,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 26 transitions. [2023-12-02 14:29:23,527 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 26 transitions. Word has length 11 [2023-12-02 14:29:23,527 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:29:23,527 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 26 transitions. [2023-12-02 14:29:23,527 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 1.32) internal successors, (33), 25 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:29:23,527 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 26 transitions. [2023-12-02 14:29:23,528 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-12-02 14:29:23,528 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:29:23,528 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:29:23,533 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-12-02 14:29:23,728 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-12-02 14:29:23,729 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 6 more)] === [2023-12-02 14:29:23,729 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:29:23,729 INFO L85 PathProgramCache]: Analyzing trace with hash 515321466, now seen corresponding path program 1 times [2023-12-02 14:29:23,729 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:29:23,729 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [220476852] [2023-12-02 14:29:23,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:29:23,730 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:29:23,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:29:24,018 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:29:24,019 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:29:24,019 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [220476852] [2023-12-02 14:29:24,020 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [220476852] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:29:24,020 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [938739060] [2023-12-02 14:29:24,020 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:29:24,020 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:29:24,020 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:29:24,021 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:29:24,023 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-12-02 14:29:24,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:29:24,092 INFO L262 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 35 conjunts are in the unsatisfiable core [2023-12-02 14:29:24,094 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:29:24,121 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2023-12-02 14:29:24,308 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 14:29:24,308 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 17 [2023-12-02 14:29:24,405 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:29:24,406 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:29:24,646 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 11 [2023-12-02 14:29:24,653 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 20 [2023-12-02 14:29:24,660 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-12-02 14:29:24,674 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:29:24,674 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [938739060] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:29:24,674 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1255012457] [2023-12-02 14:29:24,677 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-12-02 14:29:24,677 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:29:24,677 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:29:24,677 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:29:24,677 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:29:26,236 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:29:28,426 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '626#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (= |ULTIMATE.start_cstrspn_~p~0#1.offset| 1) (= |ULTIMATE.start_cstrspn_~spanp~0#1.base| |ULTIMATE.start_cstrspn_#t~post4#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~p~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= (select |#length| |ULTIMATE.start_cstrspn_#t~post4#1.base|) |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (= (+ |ULTIMATE.start_cstrspn_#t~post4#1.offset| 1) |ULTIMATE.start_cstrspn_~spanp~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#t~post4#1.base|))' at error location [2023-12-02 14:29:28,427 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 14:29:28,427 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:29:28,427 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 20 [2023-12-02 14:29:28,427 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [436369428] [2023-12-02 14:29:28,427 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:29:28,427 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2023-12-02 14:29:28,428 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:29:28,428 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2023-12-02 14:29:28,429 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=809, Unknown=3, NotChecked=0, Total=930 [2023-12-02 14:29:28,429 INFO L87 Difference]: Start difference. First operand 23 states and 26 transitions. Second operand has 22 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 21 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:29:28,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:29:28,896 INFO L93 Difference]: Finished difference Result 38 states and 43 transitions. [2023-12-02 14:29:28,897 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-12-02 14:29:28,897 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 21 states have internal predecessors, (31), 0 states have call successors, (0), 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 [2023-12-02 14:29:28,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:29:28,898 INFO L225 Difference]: With dead ends: 38 [2023-12-02 14:29:28,898 INFO L226 Difference]: Without dead ends: 38 [2023-12-02 14:29:28,899 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 280 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=207, Invalid=1196, Unknown=3, NotChecked=0, Total=1406 [2023-12-02 14:29:28,899 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 102 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 102 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 95 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 91 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 14:29:28,900 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [102 Valid, 31 Invalid, 95 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 91 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 14:29:28,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2023-12-02 14:29:28,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2023-12-02 14:29:28,902 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 29 states have (on average 1.2413793103448276) internal successors, (36), 30 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:29:28,903 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 36 transitions. [2023-12-02 14:29:28,903 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 36 transitions. Word has length 11 [2023-12-02 14:29:28,903 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:29:28,903 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 36 transitions. [2023-12-02 14:29:28,903 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 21 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:29:28,903 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 36 transitions. [2023-12-02 14:29:28,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-12-02 14:29:28,904 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:29:28,904 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2023-12-02 14:29:28,908 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-12-02 14:29:29,104 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:29:29,105 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 6 more)] === [2023-12-02 14:29:29,105 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:29:29,105 INFO L85 PathProgramCache]: Analyzing trace with hash 2074679420, now seen corresponding path program 2 times [2023-12-02 14:29:29,105 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:29:29,105 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2043804449] [2023-12-02 14:29:29,105 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:29:29,105 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:29:29,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:29:29,676 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:29:29,676 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:29:29,677 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2043804449] [2023-12-02 14:29:29,677 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2043804449] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:29:29,677 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1916228503] [2023-12-02 14:29:29,677 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 14:29:29,677 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:29:29,677 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:29:29,678 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:29:29,680 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-12-02 14:29:29,762 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-12-02 14:29:29,763 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 14:29:29,765 INFO L262 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 48 conjunts are in the unsatisfiable core [2023-12-02 14:29:29,767 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:29:29,798 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2023-12-02 14:29:30,333 INFO L349 Elim1Store]: treesize reduction 4, result has 81.8 percent of original size [2023-12-02 14:29:30,334 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 30 treesize of output 28 [2023-12-02 14:29:30,474 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:29:30,474 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:29:31,027 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 25 [2023-12-02 14:29:31,033 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2023-12-02 14:29:31,048 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 45 treesize of output 39 [2023-12-02 14:29:31,067 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:29:31,067 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1916228503] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:29:31,068 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [767881772] [2023-12-02 14:29:31,069 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-12-02 14:29:31,070 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:29:31,070 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:29:31,070 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:29:31,070 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:29:32,560 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:29:34,826 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '832#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (= |ULTIMATE.start_cstrspn_~p~0#1.offset| 1) (= |ULTIMATE.start_cstrspn_~spanp~0#1.base| |ULTIMATE.start_cstrspn_#t~post4#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~p~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= (select |#length| |ULTIMATE.start_cstrspn_#t~post4#1.base|) |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (= (+ |ULTIMATE.start_cstrspn_#t~post4#1.offset| 1) |ULTIMATE.start_cstrspn_~spanp~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#t~post4#1.base|))' at error location [2023-12-02 14:29:34,827 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 14:29:34,827 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:29:34,827 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10, 10] total 28 [2023-12-02 14:29:34,827 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [731988507] [2023-12-02 14:29:34,827 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:29:34,827 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2023-12-02 14:29:34,828 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:29:34,828 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2023-12-02 14:29:34,829 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=1332, Unknown=1, NotChecked=0, Total=1482 [2023-12-02 14:29:34,830 INFO L87 Difference]: Start difference. First operand 31 states and 36 transitions. Second operand has 30 states, 29 states have (on average 1.4827586206896552) internal successors, (43), 29 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:29:36,469 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:29:36,469 INFO L93 Difference]: Finished difference Result 62 states and 71 transitions. [2023-12-02 14:29:36,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-12-02 14:29:36,470 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 29 states have (on average 1.4827586206896552) internal successors, (43), 29 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2023-12-02 14:29:36,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:29:36,470 INFO L225 Difference]: With dead ends: 62 [2023-12-02 14:29:36,471 INFO L226 Difference]: Without dead ends: 62 [2023-12-02 14:29:36,472 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 514 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=319, Invalid=2230, Unknown=1, NotChecked=0, Total=2550 [2023-12-02 14:29:36,473 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 124 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 302 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 124 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 305 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 302 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 14:29:36,473 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [124 Valid, 67 Invalid, 305 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 302 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 14:29:36,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2023-12-02 14:29:36,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 47. [2023-12-02 14:29:36,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 45 states have (on average 1.2444444444444445) internal successors, (56), 46 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:29:36,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 56 transitions. [2023-12-02 14:29:36,478 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 56 transitions. Word has length 15 [2023-12-02 14:29:36,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:29:36,479 INFO L495 AbstractCegarLoop]: Abstraction has 47 states and 56 transitions. [2023-12-02 14:29:36,479 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 29 states have (on average 1.4827586206896552) internal successors, (43), 29 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:29:36,479 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 56 transitions. [2023-12-02 14:29:36,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-12-02 14:29:36,479 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:29:36,480 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1] [2023-12-02 14:29:36,485 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-12-02 14:29:36,680 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:29:36,680 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 6 more)] === [2023-12-02 14:29:36,681 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:29:36,681 INFO L85 PathProgramCache]: Analyzing trace with hash -1966577572, now seen corresponding path program 2 times [2023-12-02 14:29:36,681 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:29:36,681 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [214545211] [2023-12-02 14:29:36,681 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:29:36,681 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:29:36,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:29:37,474 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:29:37,474 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:29:37,474 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [214545211] [2023-12-02 14:29:37,474 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [214545211] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:29:37,474 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [830687557] [2023-12-02 14:29:37,474 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 14:29:37,474 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:29:37,475 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:29:37,475 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:29:37,476 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-12-02 14:29:37,592 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-12-02 14:29:37,593 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 14:29:37,595 WARN L260 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 100 conjunts are in the unsatisfiable core [2023-12-02 14:29:37,598 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:29:37,606 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-12-02 14:29:37,611 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 7 [2023-12-02 14:29:37,658 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2023-12-02 14:29:37,729 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 18 [2023-12-02 14:29:38,658 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:29:38,660 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:29:38,667 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 14:29:38,668 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 27 [2023-12-02 14:29:38,878 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:29:38,878 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:29:40,143 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 14:29:40,144 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 53 treesize of output 42 [2023-12-02 14:29:40,148 INFO L173 IndexEqualityManager]: detected equality via solver [2023-12-02 14:29:40,160 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 14:29:40,160 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 76 treesize of output 77 [2023-12-02 14:29:40,169 INFO L173 IndexEqualityManager]: detected equality via solver [2023-12-02 14:29:40,179 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 14:29:40,179 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 58 treesize of output 60 [2023-12-02 14:29:40,330 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 1 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:29:40,331 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [830687557] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:29:40,331 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1099150274] [2023-12-02 14:29:40,333 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-12-02 14:29:40,333 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:29:40,333 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:29:40,333 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:29:40,333 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:29:41,739 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:29:43,343 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1116#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (= |ULTIMATE.start_cstrspn_#t~post2#1.base| |ULTIMATE.start_cstrspn_~p~0#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#t~post2#1.offset|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#t~post2#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (= |ULTIMATE.start_cstrspn_~p~0#1.offset| (+ |ULTIMATE.start_cstrspn_#t~post2#1.offset| 1)) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= (select |#length| |ULTIMATE.start_cstrspn_#t~post2#1.base|) |ULTIMATE.start_cstrspn_#t~post2#1.offset|))' at error location [2023-12-02 14:29:43,343 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 14:29:43,343 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:29:43,343 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 15, 15] total 44 [2023-12-02 14:29:43,344 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1136641945] [2023-12-02 14:29:43,344 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:29:43,344 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2023-12-02 14:29:43,344 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:29:43,345 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2023-12-02 14:29:43,346 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=261, Invalid=2708, Unknown=1, NotChecked=0, Total=2970 [2023-12-02 14:29:43,347 INFO L87 Difference]: Start difference. First operand 47 states and 56 transitions. Second operand has 46 states, 45 states have (on average 1.1333333333333333) internal successors, (51), 45 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:29:49,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:29:49,283 INFO L93 Difference]: Finished difference Result 84 states and 97 transitions. [2023-12-02 14:29:49,283 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2023-12-02 14:29:49,283 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 45 states have (on average 1.1333333333333333) internal successors, (51), 45 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2023-12-02 14:29:49,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:29:49,284 INFO L225 Difference]: With dead ends: 84 [2023-12-02 14:29:49,284 INFO L226 Difference]: Without dead ends: 84 [2023-12-02 14:29:49,287 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1480 ImplicationChecksByTransitivity, 9.1s TimeCoverageRelationStatistics Valid=1104, Invalid=6905, Unknown=1, NotChecked=0, Total=8010 [2023-12-02 14:29:49,287 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 467 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 594 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 467 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 613 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 594 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-12-02 14:29:49,287 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [467 Valid, 50 Invalid, 613 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 594 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-12-02 14:29:49,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2023-12-02 14:29:49,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 67. [2023-12-02 14:29:49,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 65 states have (on average 1.2461538461538462) internal successors, (81), 66 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:29:49,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 81 transitions. [2023-12-02 14:29:49,294 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 81 transitions. Word has length 17 [2023-12-02 14:29:49,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:29:49,294 INFO L495 AbstractCegarLoop]: Abstraction has 67 states and 81 transitions. [2023-12-02 14:29:49,294 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 45 states have (on average 1.1333333333333333) internal successors, (51), 45 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:29:49,294 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 81 transitions. [2023-12-02 14:29:49,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-12-02 14:29:49,295 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:29:49,295 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 1, 1, 1, 1, 1, 1] [2023-12-02 14:29:49,300 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-12-02 14:29:49,496 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:29:49,496 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 6 more)] === [2023-12-02 14:29:49,496 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:29:49,496 INFO L85 PathProgramCache]: Analyzing trace with hash 1805842816, now seen corresponding path program 3 times [2023-12-02 14:29:49,496 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:29:49,497 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [602740399] [2023-12-02 14:29:49,497 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:29:49,497 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:29:49,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:29:50,037 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:29:50,037 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:29:50,037 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [602740399] [2023-12-02 14:29:50,037 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [602740399] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:29:50,037 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1323692891] [2023-12-02 14:29:50,038 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 14:29:50,038 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:29:50,038 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:29:50,039 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:29:50,041 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-12-02 14:29:50,128 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 14:29:50,128 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 14:29:50,130 WARN L260 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 93 conjunts are in the unsatisfiable core [2023-12-02 14:29:50,132 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:29:50,138 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-12-02 14:29:50,164 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-12-02 14:29:50,922 INFO L349 Elim1Store]: treesize reduction 12, result has 63.6 percent of original size [2023-12-02 14:29:50,922 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 6 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 41 treesize of output 39 [2023-12-02 14:29:51,044 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:29:51,045 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:29:52,105 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 59 treesize of output 51 [2023-12-02 14:29:52,112 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 59 treesize of output 45 [2023-12-02 14:29:52,178 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:29:52,178 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1323692891] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:29:52,178 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [16445935] [2023-12-02 14:29:52,180 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-12-02 14:29:52,180 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:29:52,180 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:29:52,180 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:29:52,180 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:29:53,244 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:29:56,104 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1524#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (= |ULTIMATE.start_cstrspn_~p~0#1.offset| 1) (= |ULTIMATE.start_cstrspn_~spanp~0#1.base| |ULTIMATE.start_cstrspn_#t~post4#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~p~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= (select |#length| |ULTIMATE.start_cstrspn_#t~post4#1.base|) |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (= (+ |ULTIMATE.start_cstrspn_#t~post4#1.offset| 1) |ULTIMATE.start_cstrspn_~spanp~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#t~post4#1.base|))' at error location [2023-12-02 14:29:56,104 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 14:29:56,104 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:29:56,104 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17, 16] total 44 [2023-12-02 14:29:56,104 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1096358149] [2023-12-02 14:29:56,104 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:29:56,105 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2023-12-02 14:29:56,105 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:29:56,106 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2023-12-02 14:29:56,107 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=262, Invalid=2705, Unknown=3, NotChecked=0, Total=2970 [2023-12-02 14:29:56,107 INFO L87 Difference]: Start difference. First operand 67 states and 81 transitions. Second operand has 46 states, 45 states have (on average 1.5333333333333334) internal successors, (69), 45 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:29:59,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:29:59,360 INFO L93 Difference]: Finished difference Result 164 states and 190 transitions. [2023-12-02 14:29:59,361 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2023-12-02 14:29:59,361 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 45 states have (on average 1.5333333333333334) internal successors, (69), 45 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2023-12-02 14:29:59,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:29:59,362 INFO L225 Difference]: With dead ends: 164 [2023-12-02 14:29:59,362 INFO L226 Difference]: Without dead ends: 164 [2023-12-02 14:29:59,364 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1040 ImplicationChecksByTransitivity, 7.2s TimeCoverageRelationStatistics Valid=807, Invalid=5832, Unknown=3, NotChecked=0, Total=6642 [2023-12-02 14:29:59,364 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 418 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 716 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 418 SdHoareTripleChecker+Valid, 110 SdHoareTripleChecker+Invalid, 721 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 716 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-12-02 14:29:59,365 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [418 Valid, 110 Invalid, 721 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 716 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-12-02 14:29:59,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2023-12-02 14:29:59,374 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 115. [2023-12-02 14:29:59,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 113 states have (on average 1.247787610619469) internal successors, (141), 114 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:29:59,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 141 transitions. [2023-12-02 14:29:59,375 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 141 transitions. Word has length 23 [2023-12-02 14:29:59,376 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:29:59,376 INFO L495 AbstractCegarLoop]: Abstraction has 115 states and 141 transitions. [2023-12-02 14:29:59,376 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 45 states have (on average 1.5333333333333334) internal successors, (69), 45 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:29:59,376 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 141 transitions. [2023-12-02 14:29:59,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-12-02 14:29:59,377 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:29:59,377 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 3, 2, 2, 2, 1, 1, 1, 1] [2023-12-02 14:29:59,382 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-12-02 14:29:59,577 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2023-12-02 14:29:59,578 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 6 more)] === [2023-12-02 14:29:59,578 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:29:59,578 INFO L85 PathProgramCache]: Analyzing trace with hash -139898912, now seen corresponding path program 1 times [2023-12-02 14:29:59,578 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:29:59,578 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1581283443] [2023-12-02 14:29:59,579 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:29:59,579 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:29:59,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:30:00,115 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 23 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-12-02 14:30:00,116 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:30:00,116 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1581283443] [2023-12-02 14:30:00,116 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1581283443] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:30:00,116 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [453090186] [2023-12-02 14:30:00,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:30:00,117 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:30:00,117 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:30:00,118 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:30:00,123 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-12-02 14:30:00,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:30:00,208 WARN L260 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 107 conjunts are in the unsatisfiable core [2023-12-02 14:30:00,212 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:30:00,218 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-12-02 14:30:00,242 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2023-12-02 14:30:00,297 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 14 [2023-12-02 14:30:01,556 INFO L349 Elim1Store]: treesize reduction 4, result has 81.8 percent of original size [2023-12-02 14:30:01,556 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 50 treesize of output 34 [2023-12-02 14:30:01,703 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:30:01,703 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:30:02,930 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 14:30:02,930 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 76 treesize of output 54 [2023-12-02 14:30:02,952 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 14:30:02,952 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 101 treesize of output 104 [2023-12-02 14:30:02,971 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 14:30:02,971 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 68 treesize of output 62 [2023-12-02 14:30:02,978 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2023-12-02 14:30:03,104 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:30:03,104 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [453090186] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:30:03,104 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [659352436] [2023-12-02 14:30:03,106 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-12-02 14:30:03,106 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:30:03,106 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:30:03,106 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:30:03,107 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:30:05,027 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:30:06,587 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2057#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (= |ULTIMATE.start_cstrspn_#t~post2#1.base| |ULTIMATE.start_cstrspn_~p~0#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#t~post2#1.offset|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#t~post2#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (= |ULTIMATE.start_cstrspn_~p~0#1.offset| (+ |ULTIMATE.start_cstrspn_#t~post2#1.offset| 1)) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= (select |#length| |ULTIMATE.start_cstrspn_#t~post2#1.base|) |ULTIMATE.start_cstrspn_#t~post2#1.offset|))' at error location [2023-12-02 14:30:06,588 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 14:30:06,588 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:30:06,588 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 17, 18] total 45 [2023-12-02 14:30:06,588 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1512119214] [2023-12-02 14:30:06,588 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:30:06,588 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2023-12-02 14:30:06,588 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:30:06,589 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2023-12-02 14:30:06,590 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=281, Invalid=2792, Unknown=7, NotChecked=0, Total=3080 [2023-12-02 14:30:06,591 INFO L87 Difference]: Start difference. First operand 115 states and 141 transitions. Second operand has 47 states, 46 states have (on average 1.5217391304347827) internal successors, (70), 46 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) [2023-12-02 14:30:16,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:30:16,742 INFO L93 Difference]: Finished difference Result 243 states and 293 transitions. [2023-12-02 14:30:16,742 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2023-12-02 14:30:16,742 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 46 states have (on average 1.5217391304347827) internal successors, (70), 46 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) Word has length 25 [2023-12-02 14:30:16,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:30:16,744 INFO L225 Difference]: With dead ends: 243 [2023-12-02 14:30:16,744 INFO L226 Difference]: Without dead ends: 243 [2023-12-02 14:30:16,747 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3540 ImplicationChecksByTransitivity, 12.8s TimeCoverageRelationStatistics Valid=1899, Invalid=11900, Unknown=7, NotChecked=0, Total=13806 [2023-12-02 14:30:16,748 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 274 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 773 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 274 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 786 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 773 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2023-12-02 14:30:16,748 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [274 Valid, 81 Invalid, 786 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 773 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-12-02 14:30:16,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 243 states. [2023-12-02 14:30:16,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 243 to 189. [2023-12-02 14:30:16,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 189 states, 187 states have (on average 1.2406417112299466) internal successors, (232), 188 states have internal predecessors, (232), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:30:16,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 232 transitions. [2023-12-02 14:30:16,756 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 232 transitions. Word has length 25 [2023-12-02 14:30:16,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:30:16,756 INFO L495 AbstractCegarLoop]: Abstraction has 189 states and 232 transitions. [2023-12-02 14:30:16,756 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 46 states have (on average 1.5217391304347827) internal successors, (70), 46 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) [2023-12-02 14:30:16,756 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 232 transitions. [2023-12-02 14:30:16,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2023-12-02 14:30:16,758 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:30:16,758 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 4, 3, 3, 3, 1, 1, 1, 1] [2023-12-02 14:30:16,762 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-12-02 14:30:16,958 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2023-12-02 14:30:16,958 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 6 more)] === [2023-12-02 14:30:16,959 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:30:16,959 INFO L85 PathProgramCache]: Analyzing trace with hash -1114447930, now seen corresponding path program 2 times [2023-12-02 14:30:16,959 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:30:16,959 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1852225851] [2023-12-02 14:30:16,959 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:30:16,959 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:30:16,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:30:17,616 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 58 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-12-02 14:30:17,616 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:30:17,616 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1852225851] [2023-12-02 14:30:17,616 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1852225851] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:30:17,617 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1090732977] [2023-12-02 14:30:17,617 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 14:30:17,617 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:30:17,617 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:30:17,618 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:30:17,618 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-12-02 14:30:17,729 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-12-02 14:30:17,729 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 14:30:17,731 INFO L262 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 74 conjunts are in the unsatisfiable core [2023-12-02 14:30:17,734 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:30:17,740 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-12-02 14:30:17,763 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-12-02 14:30:17,807 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 13 [2023-12-02 14:30:18,509 INFO L349 Elim1Store]: treesize reduction 8, result has 84.9 percent of original size [2023-12-02 14:30:18,509 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 35 treesize of output 59 [2023-12-02 14:30:18,992 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 3 proven. 56 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2023-12-02 14:30:18,992 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:30:24,762 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 14:30:24,762 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 64 treesize of output 42 [2023-12-02 14:30:24,799 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 14:30:24,799 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 75 treesize of output 112 [2023-12-02 14:30:24,834 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 14:30:24,834 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 28 treesize of output 46 [2023-12-02 14:30:24,845 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2023-12-02 14:30:25,092 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-12-02 14:30:25,092 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1090732977] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:30:25,092 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [578811105] [2023-12-02 14:30:25,094 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-12-02 14:30:25,094 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:30:25,094 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:30:25,094 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:30:25,094 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:30:27,029 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:30:28,537 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2872#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (= |ULTIMATE.start_cstrspn_#t~post2#1.base| |ULTIMATE.start_cstrspn_~p~0#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#t~post2#1.offset|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#t~post2#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (= |ULTIMATE.start_cstrspn_~p~0#1.offset| (+ |ULTIMATE.start_cstrspn_#t~post2#1.offset| 1)) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= (select |#length| |ULTIMATE.start_cstrspn_#t~post2#1.base|) |ULTIMATE.start_cstrspn_#t~post2#1.offset|))' at error location [2023-12-02 14:30:28,537 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 14:30:28,537 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:30:28,537 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 16, 17] total 44 [2023-12-02 14:30:28,537 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1917183922] [2023-12-02 14:30:28,537 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:30:28,538 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2023-12-02 14:30:28,538 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:30:28,539 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2023-12-02 14:30:28,540 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=232, Invalid=2736, Unknown=2, NotChecked=0, Total=2970 [2023-12-02 14:30:28,540 INFO L87 Difference]: Start difference. First operand 189 states and 232 transitions. Second operand has 46 states, 45 states have (on average 1.8) internal successors, (81), 45 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:30:33,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:30:33,044 INFO L93 Difference]: Finished difference Result 466 states and 569 transitions. [2023-12-02 14:30:33,044 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2023-12-02 14:30:33,044 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 45 states have (on average 1.8) internal successors, (81), 45 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 35 [2023-12-02 14:30:33,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:30:33,047 INFO L225 Difference]: With dead ends: 466 [2023-12-02 14:30:33,047 INFO L226 Difference]: Without dead ends: 466 [2023-12-02 14:30:33,049 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1212 ImplicationChecksByTransitivity, 11.6s TimeCoverageRelationStatistics Valid=776, Invalid=5864, Unknown=2, NotChecked=0, Total=6642 [2023-12-02 14:30:33,049 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 332 mSDsluCounter, 157 mSDsCounter, 0 mSdLazyCounter, 542 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 332 SdHoareTripleChecker+Valid, 166 SdHoareTripleChecker+Invalid, 561 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 542 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-12-02 14:30:33,050 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [332 Valid, 166 Invalid, 561 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 542 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-12-02 14:30:33,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 466 states. [2023-12-02 14:30:33,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 466 to 259. [2023-12-02 14:30:33,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 259 states, 257 states have (on average 1.2490272373540856) internal successors, (321), 258 states have internal predecessors, (321), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:30:33,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 259 states to 259 states and 321 transitions. [2023-12-02 14:30:33,061 INFO L78 Accepts]: Start accepts. Automaton has 259 states and 321 transitions. Word has length 35 [2023-12-02 14:30:33,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:30:33,061 INFO L495 AbstractCegarLoop]: Abstraction has 259 states and 321 transitions. [2023-12-02 14:30:33,061 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 45 states have (on average 1.8) internal successors, (81), 45 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:30:33,062 INFO L276 IsEmpty]: Start isEmpty. Operand 259 states and 321 transitions. [2023-12-02 14:30:33,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2023-12-02 14:30:33,064 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:30:33,064 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 8, 1, 1, 1, 1, 1, 1] [2023-12-02 14:30:33,068 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2023-12-02 14:30:33,264 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2023-12-02 14:30:33,264 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 6 more)] === [2023-12-02 14:30:33,265 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:30:33,265 INFO L85 PathProgramCache]: Analyzing trace with hash 905768840, now seen corresponding path program 4 times [2023-12-02 14:30:33,265 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:30:33,265 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1949151368] [2023-12-02 14:30:33,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:30:33,265 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:30:33,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:30:34,001 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 0 proven. 128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:30:34,001 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:30:34,001 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1949151368] [2023-12-02 14:30:34,001 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1949151368] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:30:34,002 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [636318679] [2023-12-02 14:30:34,002 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 14:30:34,002 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:30:34,002 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:30:34,003 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:30:34,007 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-12-02 14:30:34,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:30:34,114 WARN L260 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 126 conjunts are in the unsatisfiable core [2023-12-02 14:30:34,117 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:30:34,144 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2023-12-02 14:30:37,421 INFO L349 Elim1Store]: treesize reduction 28, result has 68.2 percent of original size [2023-12-02 14:30:37,421 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 9 select indices, 9 select index equivalence classes, 28 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 8 case distinctions, treesize of input 90 treesize of output 94 [2023-12-02 14:30:37,428 WARN L667 sPolynomialRelations]: Constructing 256(two to the power of 8 dual juncts. [2023-12-02 14:30:37,464 WARN L667 sPolynomialRelations]: Constructing 128(two to the power of 7 dual juncts. [2023-12-02 14:30:37,718 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 0 proven. 128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:30:37,718 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:30:41,920 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 119 treesize of output 103 [2023-12-02 14:30:41,932 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 8 select indices, 8 select index equivalence classes, 28 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 183 treesize of output 153 [2023-12-02 14:30:41,942 WARN L667 sPolynomialRelations]: Constructing 256(two to the power of 8 dual juncts. [2023-12-02 14:30:41,969 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-12-02 14:30:41,992 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 0 proven. 128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:30:41,992 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [636318679] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:30:41,992 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [562390149] [2023-12-02 14:30:41,994 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-12-02 14:30:41,994 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:30:41,994 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:30:41,995 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:30:41,995 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:30:43,150 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:30:46,275 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3960#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (= |ULTIMATE.start_cstrspn_~p~0#1.offset| 1) (= |ULTIMATE.start_cstrspn_~spanp~0#1.base| |ULTIMATE.start_cstrspn_#t~post4#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~p~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= (select |#length| |ULTIMATE.start_cstrspn_#t~post4#1.base|) |ULTIMATE.start_cstrspn_#t~post4#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (= (+ |ULTIMATE.start_cstrspn_#t~post4#1.offset| 1) |ULTIMATE.start_cstrspn_~spanp~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#t~post4#1.base|))' at error location [2023-12-02 14:30:46,275 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 14:30:46,275 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:30:46,275 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 28, 28] total 70 [2023-12-02 14:30:46,275 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [123736443] [2023-12-02 14:30:46,275 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:30:46,276 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 72 states [2023-12-02 14:30:46,276 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:30:46,277 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2023-12-02 14:30:46,279 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=521, Invalid=5956, Unknown=3, NotChecked=0, Total=6480 [2023-12-02 14:30:46,280 INFO L87 Difference]: Start difference. First operand 259 states and 321 transitions. Second operand has 72 states, 71 states have (on average 1.619718309859155) internal successors, (115), 71 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:31:05,384 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:31:05,384 INFO L93 Difference]: Finished difference Result 710 states and 828 transitions. [2023-12-02 14:31:05,384 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2023-12-02 14:31:05,385 INFO L78 Accepts]: Start accepts. Automaton has has 72 states, 71 states have (on average 1.619718309859155) internal successors, (115), 71 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 39 [2023-12-02 14:31:05,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:31:05,388 INFO L225 Difference]: With dead ends: 710 [2023-12-02 14:31:05,388 INFO L226 Difference]: Without dead ends: 710 [2023-12-02 14:31:05,389 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 50 SyntacticMatches, 1 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2444 ImplicationChecksByTransitivity, 25.9s TimeCoverageRelationStatistics Valid=1774, Invalid=14990, Unknown=6, NotChecked=0, Total=16770 [2023-12-02 14:31:05,390 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 1091 mSDsluCounter, 315 mSDsCounter, 0 mSdLazyCounter, 1951 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1091 SdHoareTripleChecker+Valid, 326 SdHoareTripleChecker+Invalid, 1967 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 1951 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.8s IncrementalHoareTripleChecker+Time [2023-12-02 14:31:05,390 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1091 Valid, 326 Invalid, 1967 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 1951 Invalid, 0 Unknown, 0 Unchecked, 2.8s Time] [2023-12-02 14:31:05,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 710 states. [2023-12-02 14:31:05,403 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 710 to 483. [2023-12-02 14:31:05,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 483 states, 481 states have (on average 1.2494802494802495) internal successors, (601), 482 states have internal predecessors, (601), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:31:05,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 483 states to 483 states and 601 transitions. [2023-12-02 14:31:05,405 INFO L78 Accepts]: Start accepts. Automaton has 483 states and 601 transitions. Word has length 39 [2023-12-02 14:31:05,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:31:05,405 INFO L495 AbstractCegarLoop]: Abstraction has 483 states and 601 transitions. [2023-12-02 14:31:05,406 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 72 states, 71 states have (on average 1.619718309859155) internal successors, (115), 71 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:31:05,406 INFO L276 IsEmpty]: Start isEmpty. Operand 483 states and 601 transitions. [2023-12-02 14:31:05,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2023-12-02 14:31:05,409 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:31:05,409 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 8, 7, 6, 6, 2, 1, 1, 1, 1] [2023-12-02 14:31:05,414 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2023-12-02 14:31:05,614 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2023-12-02 14:31:05,614 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 6 more)] === [2023-12-02 14:31:05,615 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:31:05,615 INFO L85 PathProgramCache]: Analyzing trace with hash -2126832272, now seen corresponding path program 3 times [2023-12-02 14:31:05,615 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:31:05,615 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1213894097] [2023-12-02 14:31:05,615 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:31:05,615 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:31:05,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:31:06,956 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 150 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 14:31:06,956 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:31:06,956 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1213894097] [2023-12-02 14:31:06,956 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1213894097] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:31:06,956 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2116988434] [2023-12-02 14:31:06,956 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 14:31:06,956 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:31:06,957 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:31:06,957 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:31:06,958 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-12-02 14:31:07,069 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 14:31:07,069 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 14:31:07,073 WARN L260 TraceCheckSpWp]: Trace formula consists of 345 conjuncts, 201 conjunts are in the unsatisfiable core [2023-12-02 14:31:07,079 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:31:07,084 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-12-02 14:31:07,112 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-12-02 14:31:07,163 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 13 [2023-12-02 14:31:11,460 INFO L349 Elim1Store]: treesize reduction 20, result has 59.2 percent of original size [2023-12-02 14:31:11,461 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 9 select indices, 9 select index equivalence classes, 16 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 7 case distinctions, treesize of input 105 treesize of output 61 [2023-12-02 14:31:11,472 WARN L667 sPolynomialRelations]: Constructing 64(two to the power of 6 dual juncts. [2023-12-02 14:31:11,733 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 154 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:31:11,733 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:31:17,853 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 14:31:17,854 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 180 treesize of output 114 [2023-12-02 14:31:17,886 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 14:31:17,887 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 7 select indices, 7 select index equivalence classes, 15 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 6 case distinctions, treesize of input 229 treesize of output 232 [2023-12-02 14:31:17,970 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 14:31:17,971 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 8 select indices, 8 select index equivalence classes, 15 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 13 case distinctions, treesize of input 177 treesize of output 235 [2023-12-02 14:31:17,988 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2023-12-02 14:31:18,469 WARN L667 sPolynomialRelations]: Constructing 64(two to the power of 6 dual juncts. [2023-12-02 14:31:18,581 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 154 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:31:18,581 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2116988434] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:31:18,581 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [561209500] [2023-12-02 14:31:18,583 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-12-02 14:31:18,583 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:31:18,583 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:31:18,583 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:31:18,583 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:31:20,478 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:31:23,203 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5645#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (= |ULTIMATE.start_cstrspn_#t~post2#1.base| |ULTIMATE.start_cstrspn_~p~0#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#t~post2#1.offset|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#t~post2#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (= |ULTIMATE.start_cstrspn_~p~0#1.offset| (+ |ULTIMATE.start_cstrspn_#t~post2#1.offset| 1)) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= (select |#length| |ULTIMATE.start_cstrspn_#t~post2#1.base|) |ULTIMATE.start_cstrspn_#t~post2#1.offset|))' at error location [2023-12-02 14:31:23,204 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 14:31:23,204 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:31:23,204 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 38, 38] total 95 [2023-12-02 14:31:23,204 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1074574677] [2023-12-02 14:31:23,204 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:31:23,204 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 97 states [2023-12-02 14:31:23,204 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:31:23,206 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2023-12-02 14:31:23,207 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=664, Invalid=10465, Unknown=1, NotChecked=0, Total=11130 [2023-12-02 14:31:23,207 INFO L87 Difference]: Start difference. First operand 483 states and 601 transitions. Second operand has 97 states, 96 states have (on average 1.5) internal successors, (144), 96 states have internal predecessors, (144), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:34:07,519 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:34:07,520 INFO L93 Difference]: Finished difference Result 1271 states and 1537 transitions. [2023-12-02 14:34:07,520 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 468 states. [2023-12-02 14:34:07,520 INFO L78 Accepts]: Start accepts. Automaton has has 97 states, 96 states have (on average 1.5) internal successors, (144), 96 states have internal predecessors, (144), 0 states have call successors, (0), 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 49 [2023-12-02 14:34:07,520 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:34:07,525 INFO L225 Difference]: With dead ends: 1271 [2023-12-02 14:34:07,526 INFO L226 Difference]: Without dead ends: 1271 [2023-12-02 14:34:07,545 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 630 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 570 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 117742 ImplicationChecksByTransitivity, 167.1s TimeCoverageRelationStatistics Valid=16357, Invalid=310254, Unknown=1, NotChecked=0, Total=326612 [2023-12-02 14:34:07,546 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 855 mSDsluCounter, 483 mSDsCounter, 0 mSdLazyCounter, 8177 mSolverCounterSat, 163 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 855 SdHoareTripleChecker+Valid, 502 SdHoareTripleChecker+Invalid, 8340 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 163 IncrementalHoareTripleChecker+Valid, 8177 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.3s IncrementalHoareTripleChecker+Time [2023-12-02 14:34:07,546 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [855 Valid, 502 Invalid, 8340 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [163 Valid, 8177 Invalid, 0 Unknown, 0 Unchecked, 8.3s Time] [2023-12-02 14:34:07,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1271 states. [2023-12-02 14:34:07,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1271 to 801. [2023-12-02 14:34:07,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 801 states, 799 states have (on average 1.225281602002503) internal successors, (979), 800 states have internal predecessors, (979), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:34:07,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 801 states to 801 states and 979 transitions. [2023-12-02 14:34:07,562 INFO L78 Accepts]: Start accepts. Automaton has 801 states and 979 transitions. Word has length 49 [2023-12-02 14:34:07,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:34:07,563 INFO L495 AbstractCegarLoop]: Abstraction has 801 states and 979 transitions. [2023-12-02 14:34:07,563 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 97 states, 96 states have (on average 1.5) internal successors, (144), 96 states have internal predecessors, (144), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:34:07,563 INFO L276 IsEmpty]: Start isEmpty. Operand 801 states and 979 transitions. [2023-12-02 14:34:07,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2023-12-02 14:34:07,565 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:34:07,566 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 10, 7, 6, 6, 4, 1, 1, 1, 1] [2023-12-02 14:34:07,570 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2023-12-02 14:34:07,770 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2023-12-02 14:34:07,770 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 6 more)] === [2023-12-02 14:34:07,771 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:34:07,771 INFO L85 PathProgramCache]: Analyzing trace with hash -1872549772, now seen corresponding path program 4 times [2023-12-02 14:34:07,771 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:34:07,771 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [93625564] [2023-12-02 14:34:07,771 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:34:07,771 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:34:07,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:34:08,729 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 197 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-12-02 14:34:08,729 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:34:08,729 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [93625564] [2023-12-02 14:34:08,729 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [93625564] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:34:08,730 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1960855866] [2023-12-02 14:34:08,730 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 14:34:08,730 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:34:08,730 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:34:08,731 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:34:08,732 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-12-02 14:34:08,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:34:08,830 WARN L260 TraceCheckSpWp]: Trace formula consists of 381 conjuncts, 191 conjunts are in the unsatisfiable core [2023-12-02 14:34:08,835 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:34:08,862 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-12-02 14:34:08,917 INFO L349 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2023-12-02 14:34:08,917 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 17 [2023-12-02 14:34:08,924 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2023-12-02 14:34:12,645 INFO L349 Elim1Store]: treesize reduction 56, result has 37.1 percent of original size [2023-12-02 14:34:12,646 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 9 select indices, 9 select index equivalence classes, 15 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 21 case distinctions, treesize of input 100 treesize of output 66 [2023-12-02 14:34:12,654 WARN L667 sPolynomialRelations]: Constructing 64(two to the power of 6 dual juncts. [2023-12-02 14:34:13,113 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 3 proven. 198 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-12-02 14:34:13,113 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:34:19,051 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 14:34:19,051 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 200 treesize of output 123 [2023-12-02 14:34:19,083 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 14:34:19,084 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 7 select indices, 7 select index equivalence classes, 15 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 6 case distinctions, treesize of input 247 treesize of output 244 [2023-12-02 14:34:19,162 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 14:34:19,162 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 8 select indices, 8 select index equivalence classes, 15 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 13 case distinctions, treesize of input 183 treesize of output 239 [2023-12-02 14:34:19,183 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2023-12-02 14:34:20,044 WARN L667 sPolynomialRelations]: Constructing 64(two to the power of 6 dual juncts. [2023-12-02 14:34:20,206 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 201 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-12-02 14:34:20,206 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1960855866] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:34:20,206 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [241582496] [2023-12-02 14:34:20,207 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-12-02 14:34:20,208 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:34:20,208 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:34:20,208 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:34:20,208 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:34:22,428 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:34:25,312 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9086#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (= |ULTIMATE.start_cstrspn_#t~post2#1.base| |ULTIMATE.start_cstrspn_~p~0#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#t~post2#1.offset|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_#t~malloc9#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= |ULTIMATE.start_main_#t~malloc9#1.offset| 0) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#t~post2#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (= |ULTIMATE.start_cstrspn_~p~0#1.offset| (+ |ULTIMATE.start_cstrspn_#t~post2#1.offset| 1)) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= (select |#length| |ULTIMATE.start_cstrspn_#t~post2#1.base|) |ULTIMATE.start_cstrspn_#t~post2#1.offset|))' at error location [2023-12-02 14:34:25,312 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 14:34:25,312 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:34:25,312 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 38, 38] total 90 [2023-12-02 14:34:25,313 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2068638184] [2023-12-02 14:34:25,313 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:34:25,313 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 92 states [2023-12-02 14:34:25,313 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:34:25,314 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2023-12-02 14:34:25,314 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=646, Invalid=9453, Unknown=1, NotChecked=0, Total=10100 [2023-12-02 14:34:25,315 INFO L87 Difference]: Start difference. First operand 801 states and 979 transitions. Second operand has 92 states, 91 states have (on average 1.5164835164835164) internal successors, (138), 91 states have internal predecessors, (138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:35:35,250 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:35:35,250 INFO L93 Difference]: Finished difference Result 1781 states and 2156 transitions. [2023-12-02 14:35:35,250 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 220 states. [2023-12-02 14:35:35,251 INFO L78 Accepts]: Start accepts. Automaton has has 92 states, 91 states have (on average 1.5164835164835164) internal successors, (138), 91 states have internal predecessors, (138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 57 [2023-12-02 14:35:35,251 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:35:35,257 INFO L225 Difference]: With dead ends: 1781 [2023-12-02 14:35:35,257 INFO L226 Difference]: Without dead ends: 1781 [2023-12-02 14:35:35,261 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 401 GetRequests, 84 SyntacticMatches, 0 SemanticMatches, 317 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28888 ImplicationChecksByTransitivity, 75.6s TimeCoverageRelationStatistics Valid=8476, Invalid=92965, Unknown=1, NotChecked=0, Total=101442 [2023-12-02 14:35:35,262 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 1437 mSDsluCounter, 129 mSDsCounter, 0 mSdLazyCounter, 5305 mSolverCounterSat, 222 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1437 SdHoareTripleChecker+Valid, 134 SdHoareTripleChecker+Invalid, 5527 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 222 IncrementalHoareTripleChecker+Valid, 5305 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.2s IncrementalHoareTripleChecker+Time [2023-12-02 14:35:35,262 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1437 Valid, 134 Invalid, 5527 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [222 Valid, 5305 Invalid, 0 Unknown, 0 Unchecked, 5.2s Time] [2023-12-02 14:35:35,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1781 states. [2023-12-02 14:35:35,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1781 to 705. [2023-12-02 14:35:35,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 705 states, 703 states have (on average 1.233285917496444) internal successors, (867), 704 states have internal predecessors, (867), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:35:35,279 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 705 states to 705 states and 867 transitions. [2023-12-02 14:35:35,279 INFO L78 Accepts]: Start accepts. Automaton has 705 states and 867 transitions. Word has length 57 [2023-12-02 14:35:35,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:35:35,279 INFO L495 AbstractCegarLoop]: Abstraction has 705 states and 867 transitions. [2023-12-02 14:35:35,279 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 92 states, 91 states have (on average 1.5164835164835164) internal successors, (138), 91 states have internal predecessors, (138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:35:35,280 INFO L276 IsEmpty]: Start isEmpty. Operand 705 states and 867 transitions. [2023-12-02 14:35:35,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2023-12-02 14:35:35,281 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:35:35,281 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 10, 8, 7, 7, 3, 1, 1, 1, 1] [2023-12-02 14:35:35,286 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-12-02 14:35:35,481 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:35:35,482 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 6 more)] === [2023-12-02 14:35:35,482 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:35:35,482 INFO L85 PathProgramCache]: Analyzing trace with hash -314998314, now seen corresponding path program 5 times [2023-12-02 14:35:35,482 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:35:35,482 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [3865001] [2023-12-02 14:35:35,483 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:35:35,483 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:35:35,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:35:37,117 INFO L134 CoverageAnalysis]: Checked inductivity of 236 backedges. 0 proven. 232 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 14:35:37,118 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:35:37,118 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [3865001] [2023-12-02 14:35:37,118 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [3865001] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:35:37,118 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1230916561] [2023-12-02 14:35:37,118 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 14:35:37,118 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:35:37,118 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:35:37,119 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:35:37,120 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-12-02 14:35:37,327 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2023-12-02 14:35:37,327 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 14:35:37,332 WARN L260 TraceCheckSpWp]: Trace formula consists of 400 conjuncts, 212 conjunts are in the unsatisfiable core [2023-12-02 14:35:37,336 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:35:37,341 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-12-02 14:35:37,382 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2023-12-02 14:35:37,458 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 14 [2023-12-02 14:37:57,820 INFO L349 Elim1Store]: treesize reduction 83, result has 78.7 percent of original size [2023-12-02 14:37:57,820 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 2 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 38 case distinctions, treesize of input 109 treesize of output 341 [2023-12-02 14:38:06,469 WARN L667 sPolynomialRelations]: Constructing 128(two to the power of 7 dual juncts. [2023-12-02 14:38:10,676 WARN L667 sPolynomialRelations]: Constructing 64(two to the power of 6 dual juncts. [2023-12-02 14:38:12,282 WARN L667 sPolynomialRelations]: Constructing 64(two to the power of 6 dual juncts. [2023-12-02 14:38:13,530 WARN L667 sPolynomialRelations]: Constructing 256(two to the power of 8 dual juncts. [2023-12-02 14:38:18,920 WARN L293 SmtUtils]: Spent 5.36s on a formula simplification. DAG size of input: 359 DAG size of output: 92 (called from [L 731] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2023-12-02 14:38:21,404 WARN L667 sPolynomialRelations]: Constructing 128(two to the power of 7 dual juncts. [2023-12-02 14:38:24,310 WARN L667 sPolynomialRelations]: Constructing 128(two to the power of 7 dual juncts. [2023-12-02 14:38:26,221 WARN L667 sPolynomialRelations]: Constructing 64(two to the power of 6 dual juncts. [2023-12-02 14:38:35,157 INFO L134 CoverageAnalysis]: Checked inductivity of 236 backedges. 2 proven. 222 refuted. 10 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 14:38:35,157 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:39:00,722 WARN L854 $PredicateComparison]: unable to prove that (forall ((|ULTIMATE.start_cstrspn_#t~post4#1.offset| Int) (|v_ULTIMATE.start_cstrspn_#t~post2#1.offset_117| Int) (|v_ULTIMATE.start_cstrspn_#t~post2#1.offset_116| Int) (|ULTIMATE.start_cstrspn_#t~post4#1.base| Int) (v_ArrVal_267 (Array Int Int)) (|v_ULTIMATE.start_cstrspn_#t~post2#1.offset_115| Int) (|v_ULTIMATE.start_cstrspn_#t~post2#1.offset_114| Int) (|v_ULTIMATE.start_cstrspn_~p~0#1.offset_109| Int) (|v_ULTIMATE.start_cstrspn_#t~post2#1.offset_113| Int) (|v_ULTIMATE.start_cstrspn_#t~post2#1.offset_112| Int)) (let ((.cse4 (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| v_ArrVal_267))) (let ((.cse2 (select (select .cse4 |ULTIMATE.start_cstrspn_#t~post4#1.base|) |ULTIMATE.start_cstrspn_#t~post4#1.offset|)) (.cse0 (select v_ArrVal_267 (+ |c_ULTIMATE.start_main_~nondetString2~0#1.offset| 1))) (.cse3 (select v_ArrVal_267 |c_ULTIMATE.start_main_~nondetString2~0#1.offset|)) (.cse1 (select .cse4 |c_ULTIMATE.start_main_~nondetString1~0#1.base|))) (or (< (+ |v_ULTIMATE.start_cstrspn_#t~post2#1.offset_115| 1) |v_ULTIMATE.start_cstrspn_#t~post2#1.offset_114|) (not (= .cse0 (select .cse1 (+ (- 1) |v_ULTIMATE.start_cstrspn_~p~0#1.offset_109|)))) (not (= .cse2 (select .cse1 |v_ULTIMATE.start_cstrspn_#t~post2#1.offset_117|))) (= .cse2 0) (< (+ |v_ULTIMATE.start_cstrspn_#t~post2#1.offset_112| 2) |v_ULTIMATE.start_cstrspn_~p~0#1.offset_109|) (not (= .cse3 (select .cse1 |v_ULTIMATE.start_cstrspn_#t~post2#1.offset_114|))) (< (+ |v_ULTIMATE.start_cstrspn_#t~post2#1.offset_116| 1) |v_ULTIMATE.start_cstrspn_#t~post2#1.offset_115|) (< |c_ULTIMATE.start_main_~nondetString1~0#1.offset| |v_ULTIMATE.start_cstrspn_#t~post2#1.offset_117|) (not (= .cse0 (select .cse1 |v_ULTIMATE.start_cstrspn_#t~post2#1.offset_112|))) (not (= .cse3 (select .cse1 |v_ULTIMATE.start_cstrspn_#t~post2#1.offset_115|))) (< (+ |v_ULTIMATE.start_cstrspn_#t~post2#1.offset_113| 1) |v_ULTIMATE.start_cstrspn_#t~post2#1.offset_112|) (= .cse3 0) (< |v_ULTIMATE.start_cstrspn_~p~0#1.offset_109| 1) (= .cse0 0) (< |v_ULTIMATE.start_cstrspn_~p~0#1.offset_109| (select |c_#length| |c_ULTIMATE.start_main_~nondetString1~0#1.base|)) (< (+ |v_ULTIMATE.start_cstrspn_#t~post2#1.offset_117| 1) |v_ULTIMATE.start_cstrspn_#t~post2#1.offset_116|) (not (= .cse3 (select .cse1 |v_ULTIMATE.start_cstrspn_#t~post2#1.offset_116|))) (not (= .cse3 (select .cse1 |v_ULTIMATE.start_cstrspn_#t~post2#1.offset_113|))) (< (+ |v_ULTIMATE.start_cstrspn_#t~post2#1.offset_114| 1) |v_ULTIMATE.start_cstrspn_#t~post2#1.offset_113|))))) is different from false [2023-12-02 14:39:00,784 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 14:39:00,785 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 212 treesize of output 124 [2023-12-02 14:39:01,183 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 14:39:01,184 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 9 select indices, 9 select index equivalence classes, 0 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 36 case distinctions, treesize of input 283 treesize of output 586 [2023-12-02 14:39:01,913 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 14:39:01,913 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 10 select indices, 10 select index equivalence classes, 0 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 45 case distinctions, treesize of input 230 treesize of output 552 [2023-12-02 14:39:02,026 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-12-02 14:43:31,884 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Ended with exit code 101 [2023-12-02 14:43:31,884 WARN L249 Executor]: External (MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1) with exit command (exit)) stderr output: (error "out of memory") [2023-12-02 14:43:31,885 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: External (MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1) with exit command (exit)) Received EOF on stdin. stderr output: (error "out of memory") [2023-12-02 14:43:31,885 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1076769533] [2023-12-02 14:43:31,886 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-12-02 14:43:31,886 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:43:31,887 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:43:31,887 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:43:31,887 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:43:31,889 FATAL L? ?]: Ignoring exception! de.uni_freiburg.informatik.ultimate.logic.SMTLIBException: External (MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1) with exit command (exit)) Connection to SMT solver broken at de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.convertIOException(Executor.java:337) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.input(Executor.java:177) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Scriptor.push(Scriptor.java:132) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.arrays.DiffWrapperScript.push(DiffWrapperScript.java:90) at de.uni_freiburg.informatik.ultimate.logic.WrapperScript.push(WrapperScript.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.scripttransfer.HistoryRecordingScript.push(HistoryRecordingScript.java:107) at de.uni_freiburg.informatik.ultimate.logic.Util.checkSat(Util.java:48) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.SmtUtils.checkSatTerm(SmtUtils.java:332) at de.uni_freiburg.informatik.ultimate.lib.sifa.SymbolicTools.isFalse(SymbolicTools.java:223) at de.uni_freiburg.informatik.ultimate.lib.sifa.domain.RelationCheckUtil.isEqBottom_SolverAlphaSolver(RelationCheckUtil.java:56) at de.uni_freiburg.informatik.ultimate.lib.sifa.domain.ExplicitValueDomain.isEqBottom(ExplicitValueDomain.java:73) at de.uni_freiburg.informatik.ultimate.lib.sifa.domain.CompoundDomain.isEqBottom(CompoundDomain.java:84) at de.uni_freiburg.informatik.ultimate.lib.sifa.domain.StatsWrapperDomain.isEqBottom(StatsWrapperDomain.java:69) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.earlyExitAfterStep(DagInterpreter.java:139) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.interpret(DagInterpreter.java:125) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.interpretLoisInProcedure(IcfgInterpreter.java:136) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.interpret(IcfgInterpreter.java:127) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:102) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) Caused by: java.io.IOException: Stream closed at java.base/java.lang.ProcessBuilder$NullOutputStream.write(ProcessBuilder.java:442) at java.base/java.io.OutputStream.write(OutputStream.java:157) at java.base/java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:81) at java.base/java.io.BufferedOutputStream.flush(BufferedOutputStream.java:142) at java.base/sun.nio.cs.StreamEncoder.implFlush(StreamEncoder.java:318) at java.base/sun.nio.cs.StreamEncoder.flush(StreamEncoder.java:153) at java.base/java.io.OutputStreamWriter.flush(OutputStreamWriter.java:251) at java.base/java.io.BufferedWriter.flush(BufferedWriter.java:257) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.input(Executor.java:175) ... 44 more [2023-12-02 14:43:31,891 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-12-02 14:43:31,891 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2023-12-02 14:43:31,891 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [850487796] [2023-12-02 14:43:31,891 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-12-02 14:43:31,892 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2023-12-02 14:43:31,892 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:43:31,892 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2023-12-02 14:43:31,894 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=813, Invalid=11577, Unknown=46, NotChecked=220, Total=12656 [2023-12-02 14:43:31,894 INFO L87 Difference]: Start difference. First operand 705 states and 867 transitions. Second operand has 26 states, 25 states have (on average 2.24) internal successors, (56), 25 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:43:31,895 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 111 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 2411 ImplicationChecksByTransitivity, 160.3s TimeCoverageRelationStatistics Valid=813, Invalid=11577, Unknown=46, NotChecked=220, Total=12656 [2023-12-02 14:43:31,896 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 1 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 14:43:31,896 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 0 Invalid, 1 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 14:43:31,901 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2023-12-02 14:43:32,097 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:43:32,097 FATAL L? ?]: An unrecoverable error occured during an interaction with an SMT solver: de.uni_freiburg.informatik.ultimate.logic.SMTLIBException: External (MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1) with exit command (exit)) Connection to SMT solver broken at de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.convertIOException(Executor.java:337) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.input(Executor.java:177) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Scriptor.pop(Scriptor.java:139) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.arrays.DiffWrapperScript.pop(DiffWrapperScript.java:99) at de.uni_freiburg.informatik.ultimate.logic.WrapperScript.pop(WrapperScript.java:153) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.scripttransfer.HistoryRecordingScript.pop(HistoryRecordingScript.java:117) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.ManagedScript.pop(ManagedScript.java:138) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.IncrementalHoareTripleChecker.unAssertCodeBlock(IncrementalHoareTripleChecker.java:436) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.IncrementalHoareTripleChecker.clearAssertionStack(IncrementalHoareTripleChecker.java:278) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.IncrementalHoareTripleChecker.releaseLock(IncrementalHoareTripleChecker.java:284) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.ChainingHoareTripleChecker$ProtectedHtc.releaseLock(ChainingHoareTripleChecker.java:449) at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1655) at java.base/java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:658) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.ChainingHoareTripleChecker.releaseLock(ChainingHoareTripleChecker.java:98) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.CachingHoareTripleChecker.releaseLock(CachingHoareTripleChecker.java:159) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.AbstractInterpolantAutomaton.switchToReadonlyMode(AbstractInterpolantAutomaton.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.NwaCegarLoop.computeAutomataDifference(NwaCegarLoop.java:365) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.NwaCegarLoop.refineAbstraction(NwaCegarLoop.java:325) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.refineAbstractionInternal(AbstractCegarLoop.java:487) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) Caused by: java.io.IOException: Stream closed at java.base/java.lang.ProcessBuilder$NullOutputStream.write(ProcessBuilder.java:442) at java.base/java.io.OutputStream.write(OutputStream.java:157) at java.base/java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:81) at java.base/java.io.BufferedOutputStream.flush(BufferedOutputStream.java:142) at java.base/sun.nio.cs.StreamEncoder.implFlush(StreamEncoder.java:318) at java.base/sun.nio.cs.StreamEncoder.flush(StreamEncoder.java:153) at java.base/java.io.OutputStreamWriter.flush(OutputStreamWriter.java:251) at java.base/java.io.BufferedWriter.flush(BufferedWriter.java:257) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.input(Executor.java:175) ... 36 more [2023-12-02 14:43:32,099 INFO L158 Benchmark]: Toolchain (without parser) took 857445.52ms. Allocated memory was 167.8MB in the beginning and 809.5MB in the end (delta: 641.7MB). Free memory was 131.7MB in the beginning and 395.2MB in the end (delta: -263.5MB). Peak memory consumption was 380.4MB. Max. memory is 16.1GB. [2023-12-02 14:43:32,099 INFO L158 Benchmark]: CDTParser took 0.24ms. Allocated memory is still 167.8MB. Free memory is still 109.7MB. There was no memory consumed. Max. memory is 16.1GB. [2023-12-02 14:43:32,099 INFO L158 Benchmark]: CACSL2BoogieTranslator took 333.21ms. Allocated memory is still 167.8MB. Free memory was 131.7MB in the beginning and 115.7MB in the end (delta: 16.0MB). Peak memory consumption was 14.7MB. Max. memory is 16.1GB. [2023-12-02 14:43:32,099 INFO L158 Benchmark]: Boogie Procedure Inliner took 34.27ms. Allocated memory is still 167.8MB. Free memory was 115.7MB in the beginning and 113.6MB in the end (delta: 2.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2023-12-02 14:43:32,099 INFO L158 Benchmark]: Boogie Preprocessor took 25.84ms. Allocated memory is still 167.8MB. Free memory was 113.6MB in the beginning and 112.1MB in the end (delta: 1.4MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2023-12-02 14:43:32,099 INFO L158 Benchmark]: RCFGBuilder took 379.68ms. Allocated memory is still 167.8MB. Free memory was 112.1MB in the beginning and 96.0MB in the end (delta: 16.1MB). Peak memory consumption was 16.8MB. Max. memory is 16.1GB. [2023-12-02 14:43:32,100 INFO L158 Benchmark]: TraceAbstraction took 856666.23ms. Allocated memory was 167.8MB in the beginning and 809.5MB in the end (delta: 641.7MB). Free memory was 95.4MB in the beginning and 395.2MB in the end (delta: -299.8MB). Peak memory consumption was 344.8MB. Max. memory is 16.1GB. [2023-12-02 14:43:32,101 INFO L338 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.24ms. Allocated memory is still 167.8MB. Free memory is still 109.7MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 333.21ms. Allocated memory is still 167.8MB. Free memory was 131.7MB in the beginning and 115.7MB in the end (delta: 16.0MB). Peak memory consumption was 14.7MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 34.27ms. Allocated memory is still 167.8MB. Free memory was 115.7MB in the beginning and 113.6MB in the end (delta: 2.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 25.84ms. Allocated memory is still 167.8MB. Free memory was 113.6MB in the beginning and 112.1MB in the end (delta: 1.4MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * RCFGBuilder took 379.68ms. Allocated memory is still 167.8MB. Free memory was 112.1MB in the beginning and 96.0MB in the end (delta: 16.1MB). Peak memory consumption was 16.8MB. Max. memory is 16.1GB. * TraceAbstraction took 856666.23ms. Allocated memory was 167.8MB in the beginning and 809.5MB in the end (delta: 641.7MB). Free memory was 95.4MB in the beginning and 395.2MB in the end (delta: -299.8MB). Peak memory consumption was 344.8MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - ExceptionOrErrorResult: SMTLIBException: External (MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1) with exit command (exit)) Connection to SMT solver broken de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMTLIBException: External (MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1) with exit command (exit)) Connection to SMT solver broken: de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.convertIOException(Executor.java:337) RESULT: Ultimate could not prove your program: Toolchain returned no result. Received shutdown request... --- End real Ultimate output --- Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis ### Bit-precise run ### Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/termination-memory-alloca/openbsd_cstrspn-alloca-1.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-DerefFreeMemtrack-64bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 64bit --witnessprinter.graph.data.programhash e3b4fa4839d843c17aca38b087d008ecb7fb2a74ec53840f4a61df0dde2a3794 --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-12-02 14:43:33,726 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-12-02 14:43:33,807 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-DerefFreeMemtrack-64bit-Taipan_Bitvector.epf [2023-12-02 14:43:33,812 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-12-02 14:43:33,813 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-12-02 14:43:33,838 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-12-02 14:43:33,838 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-12-02 14:43:33,839 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-12-02 14:43:33,839 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-12-02 14:43:33,840 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-12-02 14:43:33,841 INFO L153 SettingsManager]: * User list type=DISABLED [2023-12-02 14:43:33,841 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-12-02 14:43:33,842 INFO L153 SettingsManager]: * Explicit value domain=true [2023-12-02 14:43:33,842 INFO L153 SettingsManager]: * Octagon Domain=false [2023-12-02 14:43:33,843 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-12-02 14:43:33,844 INFO L153 SettingsManager]: * Interval Domain=false [2023-12-02 14:43:33,844 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-12-02 14:43:33,845 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-12-02 14:43:33,846 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-12-02 14:43:33,846 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-12-02 14:43:33,847 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-12-02 14:43:33,847 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-12-02 14:43:33,848 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2023-12-02 14:43:33,848 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-12-02 14:43:33,849 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-12-02 14:43:33,849 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-12-02 14:43:33,850 INFO L153 SettingsManager]: * Use bitvectors instead of ints=true [2023-12-02 14:43:33,850 INFO L153 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2023-12-02 14:43:33,850 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-12-02 14:43:33,851 INFO L153 SettingsManager]: * Use constant arrays=true [2023-12-02 14:43:33,851 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-12-02 14:43:33,852 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-12-02 14:43:33,852 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-12-02 14:43:33,852 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-12-02 14:43:33,852 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 14:43:33,853 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-12-02 14:43:33,853 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-12-02 14:43:33,853 INFO L153 SettingsManager]: * Trace refinement strategy=WALRUS [2023-12-02 14:43:33,853 INFO L153 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2023-12-02 14:43:33,854 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-12-02 14:43:33,854 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-12-02 14:43:33,854 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-12-02 14:43:33,854 INFO L153 SettingsManager]: * Logic for external solver=AUFBV 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_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> e3b4fa4839d843c17aca38b087d008ecb7fb2a74ec53840f4a61df0dde2a3794 [2023-12-02 14:43:34,133 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-12-02 14:43:34,152 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-12-02 14:43:34,155 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-12-02 14:43:34,156 INFO L270 PluginConnector]: Initializing CDTParser... [2023-12-02 14:43:34,156 INFO L274 PluginConnector]: CDTParser initialized [2023-12-02 14:43:34,158 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/../../sv-benchmarks/c/termination-memory-alloca/openbsd_cstrspn-alloca-1.i [2023-12-02 14:43:36,923 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-12-02 14:43:37,155 INFO L384 CDTParser]: Found 1 translation units. [2023-12-02 14:43:37,156 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/sv-benchmarks/c/termination-memory-alloca/openbsd_cstrspn-alloca-1.i [2023-12-02 14:43:37,169 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/data/3fbad054b/a0d92d4c8bc8414a96119b6697b956e6/FLAGb1d2d4c37 [2023-12-02 14:43:37,183 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/data/3fbad054b/a0d92d4c8bc8414a96119b6697b956e6 [2023-12-02 14:43:37,185 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-12-02 14:43:37,186 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-12-02 14:43:37,187 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-12-02 14:43:37,187 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-12-02 14:43:37,191 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-12-02 14:43:37,192 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 02:43:37" (1/1) ... [2023-12-02 14:43:37,192 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@718aae4d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:43:37, skipping insertion in model container [2023-12-02 14:43:37,193 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 02:43:37" (1/1) ... [2023-12-02 14:43:37,231 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-02 14:43:37,456 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 14:43:37,469 INFO L202 MainTranslator]: Completed pre-run [2023-12-02 14:43:37,505 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 14:43:37,530 INFO L206 MainTranslator]: Completed translation [2023-12-02 14:43:37,530 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:43:37 WrapperNode [2023-12-02 14:43:37,530 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-12-02 14:43:37,531 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-12-02 14:43:37,531 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-12-02 14:43:37,532 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-12-02 14:43:37,537 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:43:37" (1/1) ... [2023-12-02 14:43:37,553 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:43:37" (1/1) ... [2023-12-02 14:43:37,571 INFO L138 Inliner]: procedures = 112, calls = 13, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 63 [2023-12-02 14:43:37,572 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-12-02 14:43:37,573 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-12-02 14:43:37,573 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-12-02 14:43:37,573 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-12-02 14:43:37,580 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:43:37" (1/1) ... [2023-12-02 14:43:37,580 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:43:37" (1/1) ... [2023-12-02 14:43:37,583 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:43:37" (1/1) ... [2023-12-02 14:43:37,584 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:43:37" (1/1) ... [2023-12-02 14:43:37,592 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:43:37" (1/1) ... [2023-12-02 14:43:37,596 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:43:37" (1/1) ... [2023-12-02 14:43:37,598 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:43:37" (1/1) ... [2023-12-02 14:43:37,599 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:43:37" (1/1) ... [2023-12-02 14:43:37,603 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-12-02 14:43:37,604 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-12-02 14:43:37,604 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-12-02 14:43:37,604 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-12-02 14:43:37,605 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:43:37" (1/1) ... [2023-12-02 14:43:37,611 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 14:43:37,621 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:43:37,633 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-12-02 14:43:37,636 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-12-02 14:43:37,670 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE1 [2023-12-02 14:43:37,670 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-12-02 14:43:37,670 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE1 [2023-12-02 14:43:37,670 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-12-02 14:43:37,670 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-12-02 14:43:37,671 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-12-02 14:43:37,783 INFO L241 CfgBuilder]: Building ICFG [2023-12-02 14:43:37,785 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-12-02 14:43:38,070 INFO L282 CfgBuilder]: Performing block encoding [2023-12-02 14:43:38,102 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-12-02 14:43:38,102 INFO L309 CfgBuilder]: Removed 1 assume(true) statements. [2023-12-02 14:43:38,103 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 02:43:38 BoogieIcfgContainer [2023-12-02 14:43:38,103 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-12-02 14:43:38,105 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-12-02 14:43:38,106 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-12-02 14:43:38,109 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-12-02 14:43:38,109 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 02:43:37" (1/3) ... [2023-12-02 14:43:38,109 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4b7b6945 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 02:43:38, skipping insertion in model container [2023-12-02 14:43:38,110 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:43:37" (2/3) ... [2023-12-02 14:43:38,110 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4b7b6945 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 02:43:38, skipping insertion in model container [2023-12-02 14:43:38,110 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 02:43:38" (3/3) ... [2023-12-02 14:43:38,111 INFO L112 eAbstractionObserver]: Analyzing ICFG openbsd_cstrspn-alloca-1.i [2023-12-02 14:43:38,130 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-12-02 14:43:38,130 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 9 error locations. [2023-12-02 14:43:38,174 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-12-02 14:43:38,180 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;@55582dc6, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-12-02 14:43:38,181 INFO L358 AbstractCegarLoop]: Starting to check reachability of 9 error locations. [2023-12-02 14:43:38,184 INFO L276 IsEmpty]: Start isEmpty. Operand has 24 states, 14 states have (on average 2.0) internal successors, (28), 23 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:43:38,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2023-12-02 14:43:38,190 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:43:38,191 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2023-12-02 14:43:38,192 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 6 more)] === [2023-12-02 14:43:38,197 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:43:38,197 INFO L85 PathProgramCache]: Analyzing trace with hash 82353377, now seen corresponding path program 1 times [2023-12-02 14:43:38,209 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2023-12-02 14:43:38,209 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [576311546] [2023-12-02 14:43:38,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:43:38,210 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2023-12-02 14:43:38,210 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/mathsat [2023-12-02 14:43:38,213 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2023-12-02 14:43:38,214 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2023-12-02 14:43:38,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:43:38,302 INFO L262 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 5 conjunts are in the unsatisfiable core [2023-12-02 14:43:38,307 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:43:38,409 INFO L349 Elim1Store]: treesize reduction 19, result has 26.9 percent of original size [2023-12-02 14:43:38,410 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 15 [2023-12-02 14:43:38,427 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:43:38,427 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 14:43:38,428 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2023-12-02 14:43:38,428 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [576311546] [2023-12-02 14:43:38,429 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleMathsat [576311546] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:43:38,429 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 14:43:38,429 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-12-02 14:43:38,431 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [295710511] [2023-12-02 14:43:38,431 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:43:38,435 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 14:43:38,436 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2023-12-02 14:43:38,462 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 14:43:38,463 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 14:43:38,465 INFO L87 Difference]: Start difference. First operand has 24 states, 14 states have (on average 2.0) internal successors, (28), 23 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:43:38,585 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:43:38,585 INFO L93 Difference]: Finished difference Result 23 states and 26 transitions. [2023-12-02 14:43:38,586 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 14:43:38,588 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2023-12-02 14:43:38,588 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:43:38,594 INFO L225 Difference]: With dead ends: 23 [2023-12-02 14:43:38,595 INFO L226 Difference]: Without dead ends: 22 [2023-12-02 14:43:38,596 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 14:43:38,599 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 17 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 14:43:38,600 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 19 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 14:43:38,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2023-12-02 14:43:38,627 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2023-12-02 14:43:38,629 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 21 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:43:38,629 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 25 transitions. [2023-12-02 14:43:38,631 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 25 transitions. Word has length 5 [2023-12-02 14:43:38,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:43:38,631 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 25 transitions. [2023-12-02 14:43:38,631 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:43:38,631 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 25 transitions. [2023-12-02 14:43:38,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2023-12-02 14:43:38,632 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:43:38,632 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2023-12-02 14:43:38,636 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2023-12-02 14:43:38,832 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2023-12-02 14:43:38,833 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 6 more)] === [2023-12-02 14:43:38,833 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:43:38,833 INFO L85 PathProgramCache]: Analyzing trace with hash 82353378, now seen corresponding path program 1 times [2023-12-02 14:43:38,834 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2023-12-02 14:43:38,834 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2131519319] [2023-12-02 14:43:38,834 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:43:38,834 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2023-12-02 14:43:38,835 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/mathsat [2023-12-02 14:43:38,836 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2023-12-02 14:43:38,837 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2023-12-02 14:43:38,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:43:38,915 INFO L262 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 14:43:38,918 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:43:38,964 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:43:38,965 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 6 [2023-12-02 14:43:38,991 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-12-02 14:43:39,013 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:43:39,014 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 14:43:39,014 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2023-12-02 14:43:39,014 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2131519319] [2023-12-02 14:43:39,015 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2131519319] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:43:39,015 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 14:43:39,015 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 14:43:39,015 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [714766434] [2023-12-02 14:43:39,016 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:43:39,017 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 14:43:39,017 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2023-12-02 14:43:39,017 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 14:43:39,018 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-12-02 14:43:39,018 INFO L87 Difference]: Start difference. First operand 22 states and 25 transitions. Second operand has 4 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 4 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:43:39,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:43:39,278 INFO L93 Difference]: Finished difference Result 41 states and 46 transitions. [2023-12-02 14:43:39,279 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 14:43:39,279 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 4 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2023-12-02 14:43:39,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:43:39,280 INFO L225 Difference]: With dead ends: 41 [2023-12-02 14:43:39,280 INFO L226 Difference]: Without dead ends: 41 [2023-12-02 14:43:39,280 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 [2023-12-02 14:43:39,282 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 19 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 14:43:39,283 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 42 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 14:43:39,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2023-12-02 14:43:39,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 25. [2023-12-02 14:43:39,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 17 states have (on average 1.7058823529411764) internal successors, (29), 24 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:43:39,288 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2023-12-02 14:43:39,289 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 5 [2023-12-02 14:43:39,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:43:39,289 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2023-12-02 14:43:39,289 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 4 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:43:39,289 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2023-12-02 14:43:39,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2023-12-02 14:43:39,290 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:43:39,290 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2023-12-02 14:43:39,292 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (3)] Ended with exit code 0 [2023-12-02 14:43:39,490 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2023-12-02 14:43:39,491 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 6 more)] === [2023-12-02 14:43:39,491 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:43:39,491 INFO L85 PathProgramCache]: Analyzing trace with hash 82412960, now seen corresponding path program 1 times [2023-12-02 14:43:39,492 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2023-12-02 14:43:39,492 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [97431035] [2023-12-02 14:43:39,492 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:43:39,492 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2023-12-02 14:43:39,493 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/mathsat [2023-12-02 14:43:39,493 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2023-12-02 14:43:39,494 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2023-12-02 14:43:39,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:43:39,556 INFO L262 TraceCheckSpWp]: Trace formula consists of 28 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 14:43:39,558 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:43:39,591 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:43:39,592 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 6 [2023-12-02 14:43:39,602 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-12-02 14:43:39,625 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:43:39,626 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 14:43:39,626 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2023-12-02 14:43:39,626 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [97431035] [2023-12-02 14:43:39,626 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleMathsat [97431035] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:43:39,627 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 14:43:39,627 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 14:43:39,627 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1734215499] [2023-12-02 14:43:39,627 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:43:39,628 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 14:43:39,628 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2023-12-02 14:43:39,629 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 14:43:39,629 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-12-02 14:43:39,629 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand has 4 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 4 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:43:39,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:43:39,751 INFO L93 Difference]: Finished difference Result 24 states and 28 transitions. [2023-12-02 14:43:39,752 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 14:43:39,752 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 4 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2023-12-02 14:43:39,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:43:39,753 INFO L225 Difference]: With dead ends: 24 [2023-12-02 14:43:39,753 INFO L226 Difference]: Without dead ends: 24 [2023-12-02 14:43:39,753 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 [2023-12-02 14:43:39,755 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 37 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 14:43:39,755 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [37 Valid, 16 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 14:43:39,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2023-12-02 14:43:39,758 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 21. [2023-12-02 14:43:39,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 14 states have (on average 1.7142857142857142) internal successors, (24), 20 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:43:39,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 24 transitions. [2023-12-02 14:43:39,759 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 24 transitions. Word has length 5 [2023-12-02 14:43:39,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:43:39,760 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 24 transitions. [2023-12-02 14:43:39,760 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 4 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:43:39,760 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 24 transitions. [2023-12-02 14:43:39,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-12-02 14:43:39,760 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:43:39,761 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-12-02 14:43:39,763 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2023-12-02 14:43:39,961 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2023-12-02 14:43:39,962 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 6 more)] === [2023-12-02 14:43:39,962 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:43:39,962 INFO L85 PathProgramCache]: Analyzing trace with hash -1742012620, now seen corresponding path program 1 times [2023-12-02 14:43:39,963 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2023-12-02 14:43:39,963 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [32069975] [2023-12-02 14:43:39,963 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:43:39,963 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2023-12-02 14:43:39,963 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/mathsat [2023-12-02 14:43:39,964 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2023-12-02 14:43:39,965 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2023-12-02 14:43:40,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:43:40,007 INFO L262 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 4 conjunts are in the unsatisfiable core [2023-12-02 14:43:40,009 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:43:40,018 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 7 [2023-12-02 14:43:40,028 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:43:40,029 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 1 [2023-12-02 14:43:40,036 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:43:40,036 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 14:43:40,037 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2023-12-02 14:43:40,037 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [32069975] [2023-12-02 14:43:40,037 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleMathsat [32069975] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:43:40,037 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 14:43:40,037 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-12-02 14:43:40,037 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1130606138] [2023-12-02 14:43:40,037 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:43:40,038 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 14:43:40,038 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2023-12-02 14:43:40,038 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 14:43:40,039 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 14:43:40,039 INFO L87 Difference]: Start difference. First operand 21 states and 24 transitions. Second operand has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:43:40,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:43:40,110 INFO L93 Difference]: Finished difference Result 20 states and 23 transitions. [2023-12-02 14:43:40,110 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 14:43:40,110 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2023-12-02 14:43:40,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:43:40,111 INFO L225 Difference]: With dead ends: 20 [2023-12-02 14:43:40,111 INFO L226 Difference]: Without dead ends: 20 [2023-12-02 14:43:40,111 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 14:43:40,112 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 14 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 14:43:40,113 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 18 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 14:43:40,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2023-12-02 14:43:40,114 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2023-12-02 14:43:40,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 14 states have (on average 1.6428571428571428) internal successors, (23), 19 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:43:40,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 23 transitions. [2023-12-02 14:43:40,115 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 23 transitions. Word has length 6 [2023-12-02 14:43:40,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:43:40,115 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 23 transitions. [2023-12-02 14:43:40,116 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:43:40,116 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 23 transitions. [2023-12-02 14:43:40,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-12-02 14:43:40,116 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:43:40,116 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-12-02 14:43:40,118 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (5)] Ended with exit code 0 [2023-12-02 14:43:40,316 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2023-12-02 14:43:40,317 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 6 more)] === [2023-12-02 14:43:40,317 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:43:40,317 INFO L85 PathProgramCache]: Analyzing trace with hash -1742012619, now seen corresponding path program 1 times [2023-12-02 14:43:40,318 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2023-12-02 14:43:40,318 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1718554980] [2023-12-02 14:43:40,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:43:40,318 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2023-12-02 14:43:40,318 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/mathsat [2023-12-02 14:43:40,319 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2023-12-02 14:43:40,321 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2023-12-02 14:43:40,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:43:40,368 INFO L262 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 7 conjunts are in the unsatisfiable core [2023-12-02 14:43:40,369 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:43:40,397 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 6 [2023-12-02 14:43:40,408 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 1 [2023-12-02 14:43:40,434 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:43:40,435 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 14:43:40,435 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2023-12-02 14:43:40,435 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1718554980] [2023-12-02 14:43:40,435 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1718554980] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:43:40,435 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 14:43:40,436 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 14:43:40,436 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1470833212] [2023-12-02 14:43:40,436 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:43:40,436 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 14:43:40,436 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2023-12-02 14:43:40,437 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 14:43:40,437 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-12-02 14:43:40,437 INFO L87 Difference]: Start difference. First operand 20 states and 23 transitions. Second operand has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:43:40,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:43:40,572 INFO L93 Difference]: Finished difference Result 36 states and 40 transitions. [2023-12-02 14:43:40,573 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 14:43:40,573 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2023-12-02 14:43:40,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:43:40,574 INFO L225 Difference]: With dead ends: 36 [2023-12-02 14:43:40,574 INFO L226 Difference]: Without dead ends: 36 [2023-12-02 14:43:40,574 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-12-02 14:43:40,575 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 30 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 14:43:40,576 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [30 Valid, 28 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 14:43:40,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2023-12-02 14:43:40,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 23. [2023-12-02 14:43:40,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 17 states have (on average 1.5294117647058822) internal successors, (26), 22 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:43:40,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 26 transitions. [2023-12-02 14:43:40,580 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 26 transitions. Word has length 6 [2023-12-02 14:43:40,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:43:40,580 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 26 transitions. [2023-12-02 14:43:40,580 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:43:40,580 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 26 transitions. [2023-12-02 14:43:40,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-12-02 14:43:40,581 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:43:40,581 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-12-02 14:43:40,584 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2023-12-02 14:43:40,781 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2023-12-02 14:43:40,782 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 6 more)] === [2023-12-02 14:43:40,782 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:43:40,782 INFO L85 PathProgramCache]: Analyzing trace with hash -1741953037, now seen corresponding path program 1 times [2023-12-02 14:43:40,782 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2023-12-02 14:43:40,783 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [309212331] [2023-12-02 14:43:40,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:43:40,783 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2023-12-02 14:43:40,783 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/mathsat [2023-12-02 14:43:40,784 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2023-12-02 14:43:40,784 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1f1b3afc-1614-42f7-abb5-be114dbc6415/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2023-12-02 14:43:40,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:43:40,857 INFO L262 TraceCheckSpWp]: Trace formula consists of 35 conjuncts, 7 conjunts are in the unsatisfiable core [2023-12-02 14:43:40,859 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:43:40,881 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 6