./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-memsafety/openbsd_cmemchr-alloca-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- 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_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/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_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/openbsd_cmemchr-alloca-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 007fc8a389a67fb47c7d326d3f1d284696dfe5de13661e77d6d1bf7cce285194 --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-12-02 20:07:21,460 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-12-02 20:07:21,527 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2023-12-02 20:07:21,531 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-12-02 20:07:21,532 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-12-02 20:07:21,558 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-12-02 20:07:21,558 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-12-02 20:07:21,559 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-12-02 20:07:21,559 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-12-02 20:07:21,560 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-12-02 20:07:21,560 INFO L153 SettingsManager]: * User list type=DISABLED [2023-12-02 20:07:21,561 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-12-02 20:07:21,561 INFO L153 SettingsManager]: * Explicit value domain=true [2023-12-02 20:07:21,562 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-12-02 20:07:21,562 INFO L153 SettingsManager]: * Octagon Domain=false [2023-12-02 20:07:21,563 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-12-02 20:07:21,563 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-12-02 20:07:21,564 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-12-02 20:07:21,564 INFO L153 SettingsManager]: * Interval Domain=false [2023-12-02 20:07:21,565 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-12-02 20:07:21,565 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-12-02 20:07:21,568 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-12-02 20:07:21,568 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-12-02 20:07:21,569 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-12-02 20:07:21,569 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-12-02 20:07:21,570 INFO L153 SettingsManager]: * sizeof long=4 [2023-12-02 20:07:21,570 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-12-02 20:07:21,571 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-12-02 20:07:21,571 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-12-02 20:07:21,571 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-12-02 20:07:21,572 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2023-12-02 20:07:21,572 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-12-02 20:07:21,572 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-12-02 20:07:21,573 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-12-02 20:07:21,573 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-12-02 20:07:21,573 INFO L153 SettingsManager]: * sizeof long double=12 [2023-12-02 20:07:21,573 INFO L153 SettingsManager]: * Use constant arrays=true [2023-12-02 20:07:21,574 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-12-02 20:07:21,574 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-12-02 20:07:21,574 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-12-02 20:07:21,574 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 20:07:21,575 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-12-02 20:07:21,575 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-12-02 20:07:21,575 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-12-02 20:07:21,575 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-12-02 20:07:21,575 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-12-02 20:07:21,576 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-12-02 20:07:21,576 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-12-02 20:07:21,576 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_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 007fc8a389a67fb47c7d326d3f1d284696dfe5de13661e77d6d1bf7cce285194 [2023-12-02 20:07:21,819 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-12-02 20:07:21,842 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-12-02 20:07:21,844 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-12-02 20:07:21,845 INFO L270 PluginConnector]: Initializing CDTParser... [2023-12-02 20:07:21,846 INFO L274 PluginConnector]: CDTParser initialized [2023-12-02 20:07:21,847 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/../../sv-benchmarks/c/array-memsafety/openbsd_cmemchr-alloca-2.i [2023-12-02 20:07:24,661 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-12-02 20:07:24,900 INFO L384 CDTParser]: Found 1 translation units. [2023-12-02 20:07:24,900 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/sv-benchmarks/c/array-memsafety/openbsd_cmemchr-alloca-2.i [2023-12-02 20:07:24,915 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/data/9ebf458d2/53be50bbbc6e45dab580725864ad3708/FLAG3ea70e299 [2023-12-02 20:07:24,928 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/data/9ebf458d2/53be50bbbc6e45dab580725864ad3708 [2023-12-02 20:07:24,930 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-12-02 20:07:24,931 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-12-02 20:07:24,933 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-12-02 20:07:24,933 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-12-02 20:07:24,937 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-12-02 20:07:24,938 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 08:07:24" (1/1) ... [2023-12-02 20:07:24,938 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7b0fa521 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:07:24, skipping insertion in model container [2023-12-02 20:07:24,939 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 08:07:24" (1/1) ... [2023-12-02 20:07:24,977 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-02 20:07:25,214 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 20:07:25,224 INFO L202 MainTranslator]: Completed pre-run [2023-12-02 20:07:25,259 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 20:07:25,283 INFO L206 MainTranslator]: Completed translation [2023-12-02 20:07:25,283 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:07:25 WrapperNode [2023-12-02 20:07:25,283 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-12-02 20:07:25,284 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-12-02 20:07:25,284 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-12-02 20:07:25,284 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-12-02 20:07:25,290 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:07:25" (1/1) ... [2023-12-02 20:07:25,302 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:07:25" (1/1) ... [2023-12-02 20:07:25,321 INFO L138 Inliner]: procedures = 117, calls = 8, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 69 [2023-12-02 20:07:25,321 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-12-02 20:07:25,322 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-12-02 20:07:25,322 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-12-02 20:07:25,322 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-12-02 20:07:25,328 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:07:25" (1/1) ... [2023-12-02 20:07:25,329 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:07:25" (1/1) ... [2023-12-02 20:07:25,332 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:07:25" (1/1) ... [2023-12-02 20:07:25,332 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:07:25" (1/1) ... [2023-12-02 20:07:25,338 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:07:25" (1/1) ... [2023-12-02 20:07:25,342 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:07:25" (1/1) ... [2023-12-02 20:07:25,343 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:07:25" (1/1) ... [2023-12-02 20:07:25,344 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:07:25" (1/1) ... [2023-12-02 20:07:25,347 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-12-02 20:07:25,348 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-12-02 20:07:25,348 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-12-02 20:07:25,348 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-12-02 20:07:25,349 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:07:25" (1/1) ... [2023-12-02 20:07:25,355 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 20:07:25,371 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:07:25,385 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-12-02 20:07:25,388 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-12-02 20:07:25,413 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-12-02 20:07:25,414 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-12-02 20:07:25,414 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-12-02 20:07:25,414 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-12-02 20:07:25,414 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-12-02 20:07:25,414 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-12-02 20:07:25,502 INFO L241 CfgBuilder]: Building ICFG [2023-12-02 20:07:25,504 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-12-02 20:07:25,627 INFO L282 CfgBuilder]: Performing block encoding [2023-12-02 20:07:25,680 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-12-02 20:07:25,680 INFO L309 CfgBuilder]: Removed 2 assume(true) statements. [2023-12-02 20:07:25,682 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 08:07:25 BoogieIcfgContainer [2023-12-02 20:07:25,682 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-12-02 20:07:25,685 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-12-02 20:07:25,685 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-12-02 20:07:25,688 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-12-02 20:07:25,688 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 08:07:24" (1/3) ... [2023-12-02 20:07:25,688 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1d606851 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 08:07:25, skipping insertion in model container [2023-12-02 20:07:25,689 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:07:25" (2/3) ... [2023-12-02 20:07:25,689 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1d606851 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 08:07:25, skipping insertion in model container [2023-12-02 20:07:25,689 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 08:07:25" (3/3) ... [2023-12-02 20:07:25,691 INFO L112 eAbstractionObserver]: Analyzing ICFG openbsd_cmemchr-alloca-2.i [2023-12-02 20:07:25,706 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-12-02 20:07:25,706 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 5 error locations. [2023-12-02 20:07:25,745 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-12-02 20:07:25,750 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;@1ee3b3, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-12-02 20:07:25,750 INFO L358 AbstractCegarLoop]: Starting to check reachability of 5 error locations. [2023-12-02 20:07:25,754 INFO L276 IsEmpty]: Start isEmpty. Operand has 18 states, 12 states have (on average 1.8333333333333333) internal successors, (22), 17 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:07:25,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2023-12-02 20:07:25,758 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:07:25,759 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2023-12-02 20:07:25,759 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-12-02 20:07:25,763 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:07:25,763 INFO L85 PathProgramCache]: Analyzing trace with hash 108370, now seen corresponding path program 1 times [2023-12-02 20:07:25,771 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:07:25,771 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1715162102] [2023-12-02 20:07:25,771 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:07:25,772 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:07:25,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:07:25,997 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 20:07:26,006 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:07:26,007 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1715162102] [2023-12-02 20:07:26,007 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1715162102] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 20:07:26,008 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 20:07:26,008 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-12-02 20:07:26,010 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1083811724] [2023-12-02 20:07:26,010 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 20:07:26,015 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 20:07:26,015 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:07:26,046 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 20:07:26,047 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 20:07:26,049 INFO L87 Difference]: Start difference. First operand has 18 states, 12 states have (on average 1.8333333333333333) internal successors, (22), 17 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) 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 20:07:26,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:07:26,086 INFO L93 Difference]: Finished difference Result 17 states and 20 transitions. [2023-12-02 20:07:26,087 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 20:07:26,089 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 20:07:26,089 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:07:26,097 INFO L225 Difference]: With dead ends: 17 [2023-12-02 20:07:26,097 INFO L226 Difference]: Without dead ends: 16 [2023-12-02 20:07:26,099 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 20:07:26,103 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 15 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 11 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 20:07:26,104 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 11 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 20:07:26,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2023-12-02 20:07:26,132 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2023-12-02 20:07:26,133 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 15 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 20:07:26,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 19 transitions. [2023-12-02 20:07:26,135 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 19 transitions. Word has length 3 [2023-12-02 20:07:26,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:07:26,136 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 19 transitions. [2023-12-02 20:07:26,136 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 20:07:26,136 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 19 transitions. [2023-12-02 20:07:26,137 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2023-12-02 20:07:26,137 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:07:26,137 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2023-12-02 20:07:26,137 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-12-02 20:07:26,138 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-12-02 20:07:26,138 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:07:26,138 INFO L85 PathProgramCache]: Analyzing trace with hash 108371, now seen corresponding path program 1 times [2023-12-02 20:07:26,139 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:07:26,139 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1621964132] [2023-12-02 20:07:26,139 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:07:26,140 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:07:26,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:07:26,383 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 20:07:26,384 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:07:26,384 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1621964132] [2023-12-02 20:07:26,384 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1621964132] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 20:07:26,385 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 20:07:26,385 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-12-02 20:07:26,385 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1704658362] [2023-12-02 20:07:26,385 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 20:07:26,386 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 20:07:26,387 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:07:26,387 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 20:07:26,388 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 20:07:26,388 INFO L87 Difference]: Start difference. First operand 16 states and 19 transitions. Second operand has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:07:26,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:07:26,439 INFO L93 Difference]: Finished difference Result 16 states and 20 transitions. [2023-12-02 20:07:26,440 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 20:07:26,440 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2023-12-02 20:07:26,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:07:26,441 INFO L225 Difference]: With dead ends: 16 [2023-12-02 20:07:26,441 INFO L226 Difference]: Without dead ends: 16 [2023-12-02 20:07:26,441 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-12-02 20:07:26,443 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 2 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 20:07:26,444 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 35 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 20:07:26,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2023-12-02 20:07:26,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2023-12-02 20:07:26,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 12 states have (on average 1.5) internal successors, (18), 14 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 20:07:26,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 18 transitions. [2023-12-02 20:07:26,448 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 18 transitions. Word has length 3 [2023-12-02 20:07:26,448 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:07:26,448 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 18 transitions. [2023-12-02 20:07:26,448 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:07:26,448 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 18 transitions. [2023-12-02 20:07:26,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2023-12-02 20:07:26,449 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:07:26,449 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2023-12-02 20:07:26,449 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-12-02 20:07:26,450 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-12-02 20:07:26,450 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:07:26,450 INFO L85 PathProgramCache]: Analyzing trace with hash 105734346, now seen corresponding path program 1 times [2023-12-02 20:07:26,451 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:07:26,451 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [745572118] [2023-12-02 20:07:26,451 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:07:26,451 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:07:26,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:07:26,519 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 20:07:26,519 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:07:26,520 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [745572118] [2023-12-02 20:07:26,520 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [745572118] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 20:07:26,520 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 20:07:26,520 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-12-02 20:07:26,521 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1412700715] [2023-12-02 20:07:26,521 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 20:07:26,521 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 20:07:26,521 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:07:26,522 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 20:07:26,522 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 20:07:26,523 INFO L87 Difference]: Start difference. First operand 15 states and 18 transitions. Second operand has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:07:26,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:07:26,538 INFO L93 Difference]: Finished difference Result 16 states and 19 transitions. [2023-12-02 20:07:26,538 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 20:07:26,538 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2023-12-02 20:07:26,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:07:26,539 INFO L225 Difference]: With dead ends: 16 [2023-12-02 20:07:26,539 INFO L226 Difference]: Without dead ends: 16 [2023-12-02 20:07:26,540 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 20:07:26,541 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 1 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 8 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 8 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 20:07:26,542 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 26 Invalid, 9 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 8 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 20:07:26,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2023-12-02 20:07:26,545 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2023-12-02 20:07:26,545 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 15 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 20:07:26,546 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 19 transitions. [2023-12-02 20:07:26,546 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 19 transitions. Word has length 5 [2023-12-02 20:07:26,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:07:26,547 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 19 transitions. [2023-12-02 20:07:26,547 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:07:26,547 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 19 transitions. [2023-12-02 20:07:26,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-12-02 20:07:26,548 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:07:26,548 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-12-02 20:07:26,548 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-12-02 20:07:26,548 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-12-02 20:07:26,549 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:07:26,549 INFO L85 PathProgramCache]: Analyzing trace with hash 1344351964, now seen corresponding path program 1 times [2023-12-02 20:07:26,549 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:07:26,549 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1601509731] [2023-12-02 20:07:26,550 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:07:26,550 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:07:26,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:07:26,647 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:07:26,648 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:07:26,648 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1601509731] [2023-12-02 20:07:26,649 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1601509731] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 20:07:26,649 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 20:07:26,649 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-12-02 20:07:26,650 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1752252523] [2023-12-02 20:07:26,650 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 20:07:26,651 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 20:07:26,651 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:07:26,651 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 20:07:26,652 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 20:07:26,652 INFO L87 Difference]: Start difference. First operand 16 states and 19 transitions. Second operand has 6 states, 5 states have (on average 1.4) internal successors, (7), 6 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 20:07:26,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:07:26,717 INFO L93 Difference]: Finished difference Result 16 states and 19 transitions. [2023-12-02 20:07:26,718 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 20:07:26,718 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 1.4) internal successors, (7), 6 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 20:07:26,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:07:26,718 INFO L225 Difference]: With dead ends: 16 [2023-12-02 20:07:26,719 INFO L226 Difference]: Without dead ends: 16 [2023-12-02 20:07:26,719 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2023-12-02 20:07:26,720 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 32 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 20:07:26,721 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [32 Valid, 17 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 20:07:26,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2023-12-02 20:07:26,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2023-12-02 20:07:26,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 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 20:07:26,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 18 transitions. [2023-12-02 20:07:26,724 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 18 transitions. Word has length 7 [2023-12-02 20:07:26,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:07:26,724 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 18 transitions. [2023-12-02 20:07:26,724 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 1.4) internal successors, (7), 6 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 20:07:26,725 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 18 transitions. [2023-12-02 20:07:26,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-12-02 20:07:26,725 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:07:26,725 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-12-02 20:07:26,725 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-12-02 20:07:26,725 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-12-02 20:07:26,726 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:07:26,726 INFO L85 PathProgramCache]: Analyzing trace with hash 1344351965, now seen corresponding path program 1 times [2023-12-02 20:07:26,726 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:07:26,726 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1160791686] [2023-12-02 20:07:26,727 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:07:26,727 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:07:26,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:07:26,957 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:07:26,957 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:07:26,958 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1160791686] [2023-12-02 20:07:26,958 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1160791686] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 20:07:26,958 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1031569507] [2023-12-02 20:07:26,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:07:26,958 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:07:26,959 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:07:26,963 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:07:26,968 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-12-02 20:07:27,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:07:27,031 INFO L262 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 23 conjunts are in the unsatisfiable core [2023-12-02 20:07:27,034 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:07:27,161 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:07:27,162 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:07:27,216 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 20 treesize of output 16 [2023-12-02 20:07:27,234 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:07:27,234 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1031569507] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 20:07:27,234 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1878660459] [2023-12-02 20:07:27,250 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-12-02 20:07:27,250 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 20:07:27,253 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 20:07:27,257 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 20:07:27,257 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 20:07:28,231 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 20:07:28,989 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '220#(and (= |ULTIMATE.start_cmemchr_#in~s#1.base| |ULTIMATE.start_main_~nondetArea~0#1.base|) (= |ULTIMATE.start_cmemchr_#in~n#1| |ULTIMATE.start_main_~n~0#1|) (not (= (mod |ULTIMATE.start_cmemchr_~n#1| 4294967296) 0)) (= |ULTIMATE.start_cmemchr_#t~post3#1.base| |ULTIMATE.start_cmemchr_~p~0#1.base|) (= |ULTIMATE.start_cmemchr_#t~post3#1.offset| |ULTIMATE.start_cmemchr_~s#1.offset|) (= |ULTIMATE.start_cmemchr_#in~n#1| |ULTIMATE.start_cmemchr_~n#1|) (exists ((|v_ULTIMATE.start_main_~i~0#1_37| Int)) (and (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~n~0#1| |v_ULTIMATE.start_main_~i~0#1_37|) (<= 2 |ULTIMATE.start_main_~nondetArea~0#1.base|) (= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 |v_ULTIMATE.start_main_~i~0#1_37|))) (= |ULTIMATE.start_cmemchr_#in~s#1.offset| |ULTIMATE.start_cmemchr_~s#1.offset|) (= (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1) |ULTIMATE.start_cmemchr_~p~0#1.offset|) (= |ULTIMATE.start_cmemchr_#in~c#1| |ULTIMATE.start_cmemchr_~c#1|) (= |ULTIMATE.start_cmemchr_#in~c#1| |ULTIMATE.start_main_~c~0#1|) (= |ULTIMATE.start_cmemchr_~s#1.base| |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (= |ULTIMATE.start_cmemchr_#in~s#1.offset| |ULTIMATE.start_main_~nondetArea~0#1.offset|) (= |ULTIMATE.start_cmemchr_~s#1.base| |ULTIMATE.start_cmemchr_#t~post3#1.base|))' at error location [2023-12-02 20:07:28,990 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 20:07:28,990 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 20:07:28,990 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 10 [2023-12-02 20:07:28,990 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1772087027] [2023-12-02 20:07:28,991 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 20:07:28,991 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-12-02 20:07:28,991 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:07:28,992 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-12-02 20:07:28,992 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=261, Unknown=0, NotChecked=0, Total=306 [2023-12-02 20:07:28,993 INFO L87 Difference]: Start difference. First operand 15 states and 18 transitions. Second operand has 12 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 11 states have internal predecessors, (14), 0 states have call successors, (0), 0 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 20:07:29,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:07:29,222 INFO L93 Difference]: Finished difference Result 18 states and 22 transitions. [2023-12-02 20:07:29,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-12-02 20:07:29,225 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 11 states have internal predecessors, (14), 0 states have call successors, (0), 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 20:07:29,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:07:29,225 INFO L225 Difference]: With dead ends: 18 [2023-12-02 20:07:29,226 INFO L226 Difference]: Without dead ends: 18 [2023-12-02 20:07:29,226 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=84, Invalid=422, Unknown=0, NotChecked=0, Total=506 [2023-12-02 20:07:29,227 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 70 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 57 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 20:07:29,227 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [70 Valid, 33 Invalid, 57 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 20:07:29,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2023-12-02 20:07:29,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2023-12-02 20:07:29,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 16 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:07:29,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 20 transitions. [2023-12-02 20:07:29,231 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 20 transitions. Word has length 7 [2023-12-02 20:07:29,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:07:29,231 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 20 transitions. [2023-12-02 20:07:29,231 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 11 states have internal predecessors, (14), 0 states have call successors, (0), 0 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 20:07:29,231 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 20 transitions. [2023-12-02 20:07:29,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-12-02 20:07:29,232 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:07:29,232 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 20:07:29,239 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-12-02 20:07:29,432 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:07:29,436 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr4ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-12-02 20:07:29,436 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:07:29,436 INFO L85 PathProgramCache]: Analyzing trace with hash -1273994418, now seen corresponding path program 1 times [2023-12-02 20:07:29,436 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:07:29,436 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1395075971] [2023-12-02 20:07:29,436 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:07:29,437 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:07:29,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:07:29,515 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 20:07:29,515 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:07:29,515 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1395075971] [2023-12-02 20:07:29,515 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1395075971] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 20:07:29,515 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 20:07:29,515 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-12-02 20:07:29,516 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1182284186] [2023-12-02 20:07:29,516 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 20:07:29,516 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 20:07:29,516 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:07:29,517 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 20:07:29,517 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 20:07:29,517 INFO L87 Difference]: Start difference. First operand 17 states and 20 transitions. Second operand has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:07:29,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:07:29,533 INFO L93 Difference]: Finished difference Result 16 states and 19 transitions. [2023-12-02 20:07:29,533 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 20:07:29,534 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2023-12-02 20:07:29,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:07:29,534 INFO L225 Difference]: With dead ends: 16 [2023-12-02 20:07:29,534 INFO L226 Difference]: Without dead ends: 12 [2023-12-02 20:07:29,534 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 20:07:29,535 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 9 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 20 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 20:07:29,536 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 20 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 20:07:29,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2023-12-02 20:07:29,538 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2023-12-02 20:07:29,538 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:07:29,538 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 13 transitions. [2023-12-02 20:07:29,538 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 13 transitions. Word has length 8 [2023-12-02 20:07:29,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:07:29,539 INFO L495 AbstractCegarLoop]: Abstraction has 12 states and 13 transitions. [2023-12-02 20:07:29,539 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:07:29,539 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 13 transitions. [2023-12-02 20:07:29,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-12-02 20:07:29,539 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:07:29,539 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 20:07:29,540 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-12-02 20:07:29,540 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-12-02 20:07:29,540 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:07:29,540 INFO L85 PathProgramCache]: Analyzing trace with hash -334839733, now seen corresponding path program 1 times [2023-12-02 20:07:29,540 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:07:29,541 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1525189558] [2023-12-02 20:07:29,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:07:29,541 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:07:29,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:07:29,672 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:07:29,672 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:07:29,672 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1525189558] [2023-12-02 20:07:29,672 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1525189558] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 20:07:29,673 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [866549761] [2023-12-02 20:07:29,673 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:07:29,673 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:07:29,673 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:07:29,675 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:07:29,680 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-12-02 20:07:29,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:07:29,745 INFO L262 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 12 conjunts are in the unsatisfiable core [2023-12-02 20:07:29,747 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:07:29,784 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:07:29,784 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:07:29,876 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:07:29,876 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [866549761] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 20:07:29,876 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1635832711] [2023-12-02 20:07:29,879 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-12-02 20:07:29,879 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 20:07:29,879 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 20:07:29,879 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 20:07:29,880 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 20:07:31,409 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 20:07:32,040 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '377#(and (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) |ULTIMATE.start_cmemchr_#t~post3#1.offset|))' at error location [2023-12-02 20:07:32,040 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 20:07:32,040 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 20:07:32,040 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 13 [2023-12-02 20:07:32,040 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1974411973] [2023-12-02 20:07:32,040 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 20:07:32,041 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-12-02 20:07:32,041 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:07:32,041 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-12-02 20:07:32,042 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=401, Unknown=0, NotChecked=0, Total=462 [2023-12-02 20:07:32,042 INFO L87 Difference]: Start difference. First operand 12 states and 13 transitions. Second operand has 14 states, 14 states have (on average 1.7142857142857142) internal successors, (24), 13 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 20:07:32,130 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:07:32,130 INFO L93 Difference]: Finished difference Result 20 states and 21 transitions. [2023-12-02 20:07:32,131 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-12-02 20:07:32,131 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7142857142857142) internal successors, (24), 13 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) Word has length 11 [2023-12-02 20:07:32,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:07:32,132 INFO L225 Difference]: With dead ends: 20 [2023-12-02 20:07:32,132 INFO L226 Difference]: Without dead ends: 15 [2023-12-02 20:07:32,133 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 121 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=74, Invalid=478, Unknown=0, NotChecked=0, Total=552 [2023-12-02 20:07:32,133 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 10 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 20:07:32,134 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 33 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 20:07:32,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2023-12-02 20:07:32,136 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 14. [2023-12-02 20:07:32,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 13 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:07:32,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2023-12-02 20:07:32,137 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 11 [2023-12-02 20:07:32,137 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:07:32,137 INFO L495 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2023-12-02 20:07:32,137 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.7142857142857142) internal successors, (24), 13 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 20:07:32,137 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2023-12-02 20:07:32,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-12-02 20:07:32,138 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:07:32,138 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 20:07:32,143 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-12-02 20:07:32,343 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:07:32,343 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-12-02 20:07:32,344 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:07:32,344 INFO L85 PathProgramCache]: Analyzing trace with hash 1199323357, now seen corresponding path program 2 times [2023-12-02 20:07:32,344 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:07:32,344 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [474783880] [2023-12-02 20:07:32,344 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:07:32,344 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:07:32,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:07:32,603 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:07:32,604 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:07:32,604 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [474783880] [2023-12-02 20:07:32,604 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [474783880] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 20:07:32,604 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [959272769] [2023-12-02 20:07:32,604 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 20:07:32,604 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:07:32,604 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:07:32,606 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:07:32,611 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-12-02 20:07:32,677 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-12-02 20:07:32,677 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 20:07:32,679 INFO L262 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 35 conjunts are in the unsatisfiable core [2023-12-02 20:07:32,681 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:07:32,873 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 20:07:32,873 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:07:33,228 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2023-12-02 20:07:33,280 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 20:07:33,280 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [959272769] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 20:07:33,280 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [658976197] [2023-12-02 20:07:33,282 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-12-02 20:07:33,282 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 20:07:33,283 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 20:07:33,283 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 20:07:33,283 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 20:07:34,415 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 20:07:35,000 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '521#(or (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (< |ULTIMATE.start_cmemchr_#t~post3#1.offset| 0))' at error location [2023-12-02 20:07:35,000 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 20:07:35,000 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 20:07:35,000 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 9] total 24 [2023-12-02 20:07:35,000 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1696749626] [2023-12-02 20:07:35,000 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 20:07:35,001 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2023-12-02 20:07:35,001 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:07:35,002 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2023-12-02 20:07:35,002 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=954, Unknown=0, NotChecked=0, Total=1056 [2023-12-02 20:07:35,003 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand has 26 states, 25 states have (on average 1.4) internal successors, (35), 25 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:07:35,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:07:35,455 INFO L93 Difference]: Finished difference Result 20 states and 21 transitions. [2023-12-02 20:07:35,455 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-12-02 20:07:35,455 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 1.4) internal successors, (35), 25 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2023-12-02 20:07:35,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:07:35,456 INFO L225 Difference]: With dead ends: 20 [2023-12-02 20:07:35,456 INFO L226 Difference]: Without dead ends: 20 [2023-12-02 20:07:35,457 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 259 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=239, Invalid=1653, Unknown=0, NotChecked=0, Total=1892 [2023-12-02 20:07:35,458 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 51 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 173 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 2 SdHoareTripleChecker+Invalid, 176 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 173 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 20:07:35,458 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [51 Valid, 2 Invalid, 176 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 173 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 20:07:35,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2023-12-02 20:07:35,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 18. [2023-12-02 20:07:35,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 17 states have (on average 1.1176470588235294) 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 20:07:35,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2023-12-02 20:07:35,461 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2023-12-02 20:07:35,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:07:35,461 INFO L495 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2023-12-02 20:07:35,461 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 1.4) internal successors, (35), 25 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:07:35,461 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2023-12-02 20:07:35,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-12-02 20:07:35,462 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:07:35,462 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1] [2023-12-02 20:07:35,466 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-12-02 20:07:35,662 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:07:35,662 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-12-02 20:07:35,663 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:07:35,663 INFO L85 PathProgramCache]: Analyzing trace with hash 1255197259, now seen corresponding path program 3 times [2023-12-02 20:07:35,663 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:07:35,663 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [735641889] [2023-12-02 20:07:35,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:07:35,663 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:07:35,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:07:35,840 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:07:35,840 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:07:35,840 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [735641889] [2023-12-02 20:07:35,841 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [735641889] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 20:07:35,841 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [538749264] [2023-12-02 20:07:35,841 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 20:07:35,841 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:07:35,841 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:07:35,843 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:07:35,851 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-12-02 20:07:35,921 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 20:07:35,921 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 20:07:35,922 INFO L262 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 16 conjunts are in the unsatisfiable core [2023-12-02 20:07:35,923 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:07:35,977 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:07:35,978 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:07:36,108 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:07:36,108 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [538749264] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 20:07:36,108 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [867706563] [2023-12-02 20:07:36,110 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-12-02 20:07:36,110 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 20:07:36,110 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 20:07:36,111 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 20:07:36,111 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 20:07:37,064 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 20:07:37,571 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '702#(and (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) |ULTIMATE.start_cmemchr_#t~post3#1.offset|))' at error location [2023-12-02 20:07:37,571 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 20:07:37,571 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 20:07:37,571 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 17 [2023-12-02 20:07:37,571 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1223130157] [2023-12-02 20:07:37,572 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 20:07:37,572 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-12-02 20:07:37,572 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:07:37,573 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-12-02 20:07:37,573 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=579, Unknown=0, NotChecked=0, Total=650 [2023-12-02 20:07:37,573 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 17 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 20:07:37,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:07:37,725 INFO L93 Difference]: Finished difference Result 30 states and 31 transitions. [2023-12-02 20:07:37,725 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-12-02 20:07:37,725 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 17 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) Word has length 17 [2023-12-02 20:07:37,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:07:37,726 INFO L225 Difference]: With dead ends: 30 [2023-12-02 20:07:37,726 INFO L226 Difference]: Without dead ends: 21 [2023-12-02 20:07:37,726 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 169 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=95, Invalid=775, Unknown=0, NotChecked=0, Total=870 [2023-12-02 20:07:37,727 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 11 mSDsluCounter, 63 mSDsCounter, 0 mSdLazyCounter, 110 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 69 SdHoareTripleChecker+Invalid, 113 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 110 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 20:07:37,728 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 69 Invalid, 113 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 110 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 20:07:37,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2023-12-02 20:07:37,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2023-12-02 20:07:37,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.105263157894737) internal successors, (21), 19 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:07:37,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2023-12-02 20:07:37,730 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 17 [2023-12-02 20:07:37,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:07:37,731 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2023-12-02 20:07:37,731 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 17 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 20:07:37,731 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2023-12-02 20:07:37,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-12-02 20:07:37,731 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:07:37,732 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 1, 1, 1, 1] [2023-12-02 20:07:37,736 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-12-02 20:07:37,932 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:07:37,932 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-12-02 20:07:37,933 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:07:37,933 INFO L85 PathProgramCache]: Analyzing trace with hash -1533670051, now seen corresponding path program 4 times [2023-12-02 20:07:37,933 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:07:37,933 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1442601741] [2023-12-02 20:07:37,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:07:37,933 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:07:37,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:07:38,274 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:07:38,274 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:07:38,274 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1442601741] [2023-12-02 20:07:38,275 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1442601741] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 20:07:38,275 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1741619811] [2023-12-02 20:07:38,275 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 20:07:38,275 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:07:38,275 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:07:38,276 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:07:38,278 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-12-02 20:07:38,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:07:38,343 INFO L262 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 36 conjunts are in the unsatisfiable core [2023-12-02 20:07:38,344 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:07:38,449 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:07:38,449 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:07:38,613 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2023-12-02 20:07:38,651 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:07:38,651 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1741619811] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 20:07:38,651 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [95485278] [2023-12-02 20:07:38,653 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-12-02 20:07:38,653 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 20:07:38,653 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 20:07:38,653 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 20:07:38,654 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 20:07:39,563 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 20:07:40,004 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '902#(or (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (< |ULTIMATE.start_cmemchr_#t~post3#1.offset| 0))' at error location [2023-12-02 20:07:40,004 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 20:07:40,004 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 20:07:40,004 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 24 [2023-12-02 20:07:40,004 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1075853418] [2023-12-02 20:07:40,004 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 20:07:40,005 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2023-12-02 20:07:40,005 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:07:40,006 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2023-12-02 20:07:40,006 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=952, Unknown=0, NotChecked=0, Total=1056 [2023-12-02 20:07:40,006 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand has 26 states, 25 states have (on average 1.72) internal successors, (43), 25 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 20:07:40,369 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:07:40,369 INFO L93 Difference]: Finished difference Result 26 states and 27 transitions. [2023-12-02 20:07:40,369 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-12-02 20:07:40,369 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 1.72) internal successors, (43), 25 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 19 [2023-12-02 20:07:40,369 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:07:40,370 INFO L225 Difference]: With dead ends: 26 [2023-12-02 20:07:40,370 INFO L226 Difference]: Without dead ends: 26 [2023-12-02 20:07:40,371 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 31 SyntacticMatches, 3 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 421 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=216, Invalid=1506, Unknown=0, NotChecked=0, Total=1722 [2023-12-02 20:07:40,371 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 75 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 238 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 239 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 238 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 20:07:40,372 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [75 Valid, 23 Invalid, 239 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 238 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 20:07:40,372 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2023-12-02 20:07:40,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 24. [2023-12-02 20:07:40,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.0869565217391304) internal successors, (25), 23 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 20:07:40,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2023-12-02 20:07:40,374 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 19 [2023-12-02 20:07:40,374 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:07:40,374 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2023-12-02 20:07:40,374 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 1.72) internal successors, (43), 25 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 20:07:40,374 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2023-12-02 20:07:40,375 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-12-02 20:07:40,375 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:07:40,375 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 1, 1, 1, 1] [2023-12-02 20:07:40,379 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-12-02 20:07:40,575 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-12-02 20:07:40,576 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-12-02 20:07:40,576 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:07:40,576 INFO L85 PathProgramCache]: Analyzing trace with hash 636247755, now seen corresponding path program 5 times [2023-12-02 20:07:40,576 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:07:40,576 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [100609960] [2023-12-02 20:07:40,576 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:07:40,576 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:07:40,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:07:40,781 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:07:40,781 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:07:40,781 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [100609960] [2023-12-02 20:07:40,781 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [100609960] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 20:07:40,781 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1676341491] [2023-12-02 20:07:40,781 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 20:07:40,781 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:07:40,782 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:07:40,782 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:07:40,785 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-12-02 20:07:40,902 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-12-02 20:07:40,902 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 20:07:40,904 INFO L262 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 20 conjunts are in the unsatisfiable core [2023-12-02 20:07:40,905 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:07:40,944 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:07:40,944 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:07:41,111 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:07:41,111 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1676341491] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 20:07:41,111 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1558109040] [2023-12-02 20:07:41,113 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-12-02 20:07:41,113 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 20:07:41,113 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 20:07:41,113 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 20:07:41,113 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 20:07:41,988 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 20:07:42,420 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1131#(or (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (< |ULTIMATE.start_cmemchr_#t~post3#1.offset| 0))' at error location [2023-12-02 20:07:42,420 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 20:07:42,421 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 20:07:42,421 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 21 [2023-12-02 20:07:42,421 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [773474918] [2023-12-02 20:07:42,421 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 20:07:42,421 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2023-12-02 20:07:42,422 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:07:42,422 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2023-12-02 20:07:42,423 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=735, Unknown=0, NotChecked=0, Total=812 [2023-12-02 20:07:42,423 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand has 22 states, 22 states have (on average 2.1818181818181817) internal successors, (48), 21 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:07:42,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:07:42,658 INFO L93 Difference]: Finished difference Result 40 states and 41 transitions. [2023-12-02 20:07:42,658 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-12-02 20:07:42,658 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.1818181818181817) internal successors, (48), 21 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2023-12-02 20:07:42,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:07:42,658 INFO L225 Difference]: With dead ends: 40 [2023-12-02 20:07:42,659 INFO L226 Difference]: Without dead ends: 27 [2023-12-02 20:07:42,659 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 202 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=112, Invalid=1078, Unknown=0, NotChecked=0, Total=1190 [2023-12-02 20:07:42,660 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 26 mSDsluCounter, 120 mSDsCounter, 0 mSdLazyCounter, 195 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 129 SdHoareTripleChecker+Invalid, 200 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 195 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 20:07:42,660 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 129 Invalid, 200 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 195 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 20:07:42,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2023-12-02 20:07:42,661 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2023-12-02 20:07:42,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.08) internal successors, (27), 25 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:07:42,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 27 transitions. [2023-12-02 20:07:42,662 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 27 transitions. Word has length 23 [2023-12-02 20:07:42,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:07:42,662 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 27 transitions. [2023-12-02 20:07:42,662 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 2.1818181818181817) internal successors, (48), 21 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:07:42,662 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 27 transitions. [2023-12-02 20:07:42,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-12-02 20:07:42,663 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:07:42,663 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 1, 1, 1, 1] [2023-12-02 20:07:42,668 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-12-02 20:07:42,863 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:07:42,864 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-12-02 20:07:42,864 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:07:42,864 INFO L85 PathProgramCache]: Analyzing trace with hash 1369672797, now seen corresponding path program 6 times [2023-12-02 20:07:42,864 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:07:42,864 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1023732691] [2023-12-02 20:07:42,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:07:42,864 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:07:42,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:07:43,314 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 12 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:07:43,314 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:07:43,314 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1023732691] [2023-12-02 20:07:43,314 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1023732691] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 20:07:43,315 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [355763581] [2023-12-02 20:07:43,315 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 20:07:43,315 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:07:43,315 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:07:43,316 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:07:43,316 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-12-02 20:07:43,390 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 20:07:43,390 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 20:07:43,392 INFO L262 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 46 conjunts are in the unsatisfiable core [2023-12-02 20:07:43,394 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:07:43,401 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 20:07:43,552 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 12 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:07:43,553 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:07:43,870 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 12 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:07:43,870 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [355763581] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 20:07:43,870 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1266938674] [2023-12-02 20:07:43,872 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-12-02 20:07:43,872 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 20:07:43,872 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 20:07:43,872 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 20:07:43,873 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 20:07:44,716 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 20:07:45,193 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1394#(or (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (< |ULTIMATE.start_cmemchr_#t~post3#1.offset| 0))' at error location [2023-12-02 20:07:45,193 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 20:07:45,193 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 20:07:45,193 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 32 [2023-12-02 20:07:45,193 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [411571645] [2023-12-02 20:07:45,193 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 20:07:45,194 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2023-12-02 20:07:45,194 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:07:45,195 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2023-12-02 20:07:45,195 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=1479, Unknown=0, NotChecked=0, Total=1640 [2023-12-02 20:07:45,195 INFO L87 Difference]: Start difference. First operand 26 states and 27 transitions. Second operand has 34 states, 33 states have (on average 1.9090909090909092) internal successors, (63), 33 states have internal predecessors, (63), 0 states have call successors, (0), 0 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 20:07:45,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:07:45,773 INFO L93 Difference]: Finished difference Result 32 states and 33 transitions. [2023-12-02 20:07:45,773 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2023-12-02 20:07:45,773 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 33 states have (on average 1.9090909090909092) internal successors, (63), 33 states have internal predecessors, (63), 0 states have call successors, (0), 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 20:07:45,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:07:45,774 INFO L225 Difference]: With dead ends: 32 [2023-12-02 20:07:45,774 INFO L226 Difference]: Without dead ends: 32 [2023-12-02 20:07:45,775 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 647 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=309, Invalid=2343, Unknown=0, NotChecked=0, Total=2652 [2023-12-02 20:07:45,775 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 74 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 310 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 311 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 310 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 20:07:45,775 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [74 Valid, 32 Invalid, 311 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 310 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 20:07:45,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2023-12-02 20:07:45,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2023-12-02 20:07:45,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 29 states have (on average 1.0689655172413792) internal successors, (31), 29 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 20:07:45,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2023-12-02 20:07:45,778 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 25 [2023-12-02 20:07:45,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:07:45,778 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2023-12-02 20:07:45,778 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 33 states have (on average 1.9090909090909092) internal successors, (63), 33 states have internal predecessors, (63), 0 states have call successors, (0), 0 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 20:07:45,778 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2023-12-02 20:07:45,779 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2023-12-02 20:07:45,779 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:07:45,779 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 1, 1, 1, 1] [2023-12-02 20:07:45,783 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2023-12-02 20:07:45,979 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:07:45,980 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-12-02 20:07:45,980 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:07:45,980 INFO L85 PathProgramCache]: Analyzing trace with hash -2111676981, now seen corresponding path program 7 times [2023-12-02 20:07:45,980 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:07:45,980 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1193214609] [2023-12-02 20:07:45,980 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:07:45,980 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:07:46,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:07:46,248 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 8 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:07:46,248 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:07:46,248 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1193214609] [2023-12-02 20:07:46,248 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1193214609] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 20:07:46,248 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1800705836] [2023-12-02 20:07:46,249 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 20:07:46,249 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:07:46,249 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:07:46,250 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:07:46,255 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-12-02 20:07:46,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:07:46,368 INFO L262 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 24 conjunts are in the unsatisfiable core [2023-12-02 20:07:46,370 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:07:46,431 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 8 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:07:46,431 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:07:46,696 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 8 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:07:46,697 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1800705836] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 20:07:46,697 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1802990801] [2023-12-02 20:07:46,699 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-12-02 20:07:46,699 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 20:07:46,699 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 20:07:46,700 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 20:07:46,700 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 20:07:47,450 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 20:07:48,083 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1679#(and (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) |ULTIMATE.start_cmemchr_#t~post3#1.offset|))' at error location [2023-12-02 20:07:48,084 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 20:07:48,084 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 20:07:48,084 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 25 [2023-12-02 20:07:48,084 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1023654731] [2023-12-02 20:07:48,084 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 20:07:48,084 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2023-12-02 20:07:48,084 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:07:48,085 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2023-12-02 20:07:48,085 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=1031, Unknown=0, NotChecked=0, Total=1122 [2023-12-02 20:07:48,085 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand has 26 states, 26 states have (on average 2.3076923076923075) internal successors, (60), 25 states have internal predecessors, (60), 0 states have call successors, (0), 0 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 20:07:48,406 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:07:48,406 INFO L93 Difference]: Finished difference Result 50 states and 51 transitions. [2023-12-02 20:07:48,406 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-12-02 20:07:48,406 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.3076923076923075) internal successors, (60), 25 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 29 [2023-12-02 20:07:48,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:07:48,406 INFO L225 Difference]: With dead ends: 50 [2023-12-02 20:07:48,406 INFO L226 Difference]: Without dead ends: 33 [2023-12-02 20:07:48,407 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 289 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=137, Invalid=1585, Unknown=0, NotChecked=0, Total=1722 [2023-12-02 20:07:48,407 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 35 mSDsluCounter, 192 mSDsCounter, 0 mSdLazyCounter, 278 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 204 SdHoareTripleChecker+Invalid, 284 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 278 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 20:07:48,408 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [35 Valid, 204 Invalid, 284 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 278 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 20:07:48,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2023-12-02 20:07:48,409 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2023-12-02 20:07:48,410 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 31 states have (on average 1.064516129032258) internal successors, (33), 31 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 20:07:48,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 33 transitions. [2023-12-02 20:07:48,410 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 33 transitions. Word has length 29 [2023-12-02 20:07:48,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:07:48,410 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 33 transitions. [2023-12-02 20:07:48,410 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.3076923076923075) internal successors, (60), 25 states have internal predecessors, (60), 0 states have call successors, (0), 0 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 20:07:48,410 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 33 transitions. [2023-12-02 20:07:48,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2023-12-02 20:07:48,411 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:07:48,411 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 1, 1, 1, 1] [2023-12-02 20:07:48,416 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2023-12-02 20:07:48,611 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-12-02 20:07:48,611 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-12-02 20:07:48,612 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:07:48,612 INFO L85 PathProgramCache]: Analyzing trace with hash 1817286109, now seen corresponding path program 8 times [2023-12-02 20:07:48,612 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:07:48,612 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [453778133] [2023-12-02 20:07:48,612 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:07:48,612 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:07:48,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:07:49,087 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 20 proven. 37 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:07:49,088 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:07:49,088 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [453778133] [2023-12-02 20:07:49,088 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [453778133] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 20:07:49,088 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1162826476] [2023-12-02 20:07:49,088 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 20:07:49,088 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:07:49,088 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:07:49,089 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:07:49,090 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-12-02 20:07:49,297 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2023-12-02 20:07:49,297 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 20:07:49,299 INFO L262 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 81 conjunts are in the unsatisfiable core [2023-12-02 20:07:49,302 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:07:49,306 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-12-02 20:07:50,243 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 4 proven. 44 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-12-02 20:07:50,243 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:07:51,438 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 8 proven. 45 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 20:07:51,439 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1162826476] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 20:07:51,439 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [243212829] [2023-12-02 20:07:51,440 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-12-02 20:07:51,440 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 20:07:51,441 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 20:07:51,441 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 20:07:51,441 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 20:07:52,413 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 20:07:53,203 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2014#(or (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (< |ULTIMATE.start_cmemchr_#t~post3#1.offset| 0))' at error location [2023-12-02 20:07:53,203 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 20:07:53,203 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 20:07:53,203 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17, 18] total 47 [2023-12-02 20:07:53,203 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [374232458] [2023-12-02 20:07:53,203 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 20:07:53,204 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2023-12-02 20:07:53,204 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:07:53,205 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2023-12-02 20:07:53,206 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=282, Invalid=2798, Unknown=0, NotChecked=0, Total=3080 [2023-12-02 20:07:53,206 INFO L87 Difference]: Start difference. First operand 32 states and 33 transitions. Second operand has 49 states, 48 states have (on average 1.75) internal successors, (84), 48 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:07:56,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:07:56,269 INFO L93 Difference]: Finished difference Result 53 states and 54 transitions. [2023-12-02 20:07:56,269 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2023-12-02 20:07:56,270 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 48 states have (on average 1.75) internal successors, (84), 48 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 31 [2023-12-02 20:07:56,270 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:07:56,270 INFO L225 Difference]: With dead ends: 53 [2023-12-02 20:07:56,270 INFO L226 Difference]: Without dead ends: 53 [2023-12-02 20:07:56,272 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 50 SyntacticMatches, 1 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1328 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=980, Invalid=6502, Unknown=0, NotChecked=0, Total=7482 [2023-12-02 20:07:56,273 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 142 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 641 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 142 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 650 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 641 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 20:07:56,273 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [142 Valid, 54 Invalid, 650 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 641 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 20:07:56,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2023-12-02 20:07:56,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 52. [2023-12-02 20:07:56,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 51 states have (on average 1.0392156862745099) internal successors, (53), 51 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:07:56,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 53 transitions. [2023-12-02 20:07:56,276 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 53 transitions. Word has length 31 [2023-12-02 20:07:56,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:07:56,276 INFO L495 AbstractCegarLoop]: Abstraction has 52 states and 53 transitions. [2023-12-02 20:07:56,276 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 48 states have (on average 1.75) internal successors, (84), 48 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:07:56,276 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 53 transitions. [2023-12-02 20:07:56,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2023-12-02 20:07:56,277 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:07:56,277 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 9, 5, 5, 1, 1, 1, 1] [2023-12-02 20:07:56,282 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2023-12-02 20:07:56,478 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:07:56,478 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-12-02 20:07:56,478 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:07:56,478 INFO L85 PathProgramCache]: Analyzing trace with hash 2047010563, now seen corresponding path program 9 times [2023-12-02 20:07:56,478 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:07:56,479 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1420393875] [2023-12-02 20:07:56,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:07:56,479 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:07:56,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:07:56,821 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 90 proven. 65 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2023-12-02 20:07:56,821 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:07:56,822 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1420393875] [2023-12-02 20:07:56,822 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1420393875] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 20:07:56,822 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [394372938] [2023-12-02 20:07:56,822 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 20:07:56,822 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:07:56,822 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:07:56,823 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:07:56,832 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-12-02 20:07:56,969 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 20:07:56,970 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 20:07:56,974 INFO L262 TraceCheckSpWp]: Trace formula consists of 308 conjuncts, 112 conjunts are in the unsatisfiable core [2023-12-02 20:07:56,977 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:07:56,985 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-12-02 20:07:57,496 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 88 proven. 75 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-12-02 20:07:57,496 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:07:58,535 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:07:58,535 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [394372938] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 20:07:58,536 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1012300588] [2023-12-02 20:07:58,537 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-12-02 20:07:58,537 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 20:07:58,538 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 20:07:58,538 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 20:07:58,538 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 20:07:59,433 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 20:08:00,105 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2538#(or (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (< |ULTIMATE.start_cmemchr_#t~post3#1.offset| 0))' at error location [2023-12-02 20:08:00,105 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 20:08:00,105 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 20:08:00,105 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 16, 20] total 49 [2023-12-02 20:08:00,105 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1495231471] [2023-12-02 20:08:00,105 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 20:08:00,106 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2023-12-02 20:08:00,106 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:08:00,106 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2023-12-02 20:08:00,107 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=2996, Unknown=0, NotChecked=0, Total=3192 [2023-12-02 20:08:00,107 INFO L87 Difference]: Start difference. First operand 52 states and 53 transitions. Second operand has 50 states, 50 states have (on average 2.48) internal successors, (124), 49 states have internal predecessors, (124), 0 states have call successors, (0), 0 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 20:08:04,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:08:04,576 INFO L93 Difference]: Finished difference Result 129 states and 135 transitions. [2023-12-02 20:08:04,576 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2023-12-02 20:08:04,577 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 2.48) internal successors, (124), 49 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 51 [2023-12-02 20:08:04,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:08:04,579 INFO L225 Difference]: With dead ends: 129 [2023-12-02 20:08:04,579 INFO L226 Difference]: Without dead ends: 108 [2023-12-02 20:08:04,582 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 110 SyntacticMatches, 0 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1786 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=1006, Invalid=8894, Unknown=0, NotChecked=0, Total=9900 [2023-12-02 20:08:04,582 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 411 mSDsluCounter, 190 mSDsCounter, 0 mSdLazyCounter, 1158 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 411 SdHoareTripleChecker+Valid, 196 SdHoareTripleChecker+Invalid, 1182 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 1158 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-12-02 20:08:04,582 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [411 Valid, 196 Invalid, 1182 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 1158 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-12-02 20:08:04,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2023-12-02 20:08:04,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 69. [2023-12-02 20:08:04,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 68 states have (on average 1.1029411764705883) internal successors, (75), 68 states have internal predecessors, (75), 0 states have call successors, (0), 0 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 20:08:04,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 75 transitions. [2023-12-02 20:08:04,588 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 75 transitions. Word has length 51 [2023-12-02 20:08:04,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:08:04,588 INFO L495 AbstractCegarLoop]: Abstraction has 69 states and 75 transitions. [2023-12-02 20:08:04,589 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 2.48) internal successors, (124), 49 states have internal predecessors, (124), 0 states have call successors, (0), 0 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 20:08:04,589 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 75 transitions. [2023-12-02 20:08:04,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2023-12-02 20:08:04,590 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:08:04,590 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 9, 6, 6, 1, 1, 1, 1] [2023-12-02 20:08:04,596 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2023-12-02 20:08:04,790 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:08:04,790 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-12-02 20:08:04,791 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:08:04,791 INFO L85 PathProgramCache]: Analyzing trace with hash 401925525, now seen corresponding path program 10 times [2023-12-02 20:08:04,791 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:08:04,791 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1399452093] [2023-12-02 20:08:04,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:08:04,791 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:08:04,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:08:05,106 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 84 proven. 96 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-12-02 20:08:05,106 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:08:05,106 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1399452093] [2023-12-02 20:08:05,106 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1399452093] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 20:08:05,107 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [805305597] [2023-12-02 20:08:05,107 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 20:08:05,107 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:08:05,107 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:08:05,108 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:08:05,110 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-12-02 20:08:05,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:08:05,222 INFO L262 TraceCheckSpWp]: Trace formula consists of 321 conjuncts, 70 conjunts are in the unsatisfiable core [2023-12-02 20:08:05,225 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:08:05,235 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 20:08:05,812 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 144 proven. 42 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-12-02 20:08:05,812 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:08:06,464 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 144 proven. 42 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-12-02 20:08:06,464 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [805305597] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 20:08:06,464 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1585956294] [2023-12-02 20:08:06,466 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-12-02 20:08:06,466 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 20:08:06,466 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 20:08:06,466 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 20:08:06,466 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 20:08:07,283 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 20:08:07,906 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3192#(or (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (< |ULTIMATE.start_cmemchr_#t~post3#1.offset| 0))' at error location [2023-12-02 20:08:07,907 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 20:08:07,907 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 20:08:07,907 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 18, 18] total 50 [2023-12-02 20:08:07,907 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2045821807] [2023-12-02 20:08:07,907 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 20:08:07,908 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2023-12-02 20:08:07,908 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:08:07,908 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2023-12-02 20:08:07,910 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=230, Invalid=3076, Unknown=0, NotChecked=0, Total=3306 [2023-12-02 20:08:07,910 INFO L87 Difference]: Start difference. First operand 69 states and 75 transitions. Second operand has 51 states, 51 states have (on average 2.4705882352941178) internal successors, (126), 50 states have internal predecessors, (126), 0 states have call successors, (0), 0 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 20:08:09,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:08:09,401 INFO L93 Difference]: Finished difference Result 94 states and 99 transitions. [2023-12-02 20:08:09,401 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2023-12-02 20:08:09,402 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 2.4705882352941178) internal successors, (126), 50 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 53 [2023-12-02 20:08:09,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:08:09,402 INFO L225 Difference]: With dead ends: 94 [2023-12-02 20:08:09,403 INFO L226 Difference]: Without dead ends: 69 [2023-12-02 20:08:09,404 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 117 SyntacticMatches, 0 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1219 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=588, Invalid=5418, Unknown=0, NotChecked=0, Total=6006 [2023-12-02 20:08:09,405 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 219 mSDsluCounter, 154 mSDsCounter, 0 mSdLazyCounter, 934 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 219 SdHoareTripleChecker+Valid, 160 SdHoareTripleChecker+Invalid, 949 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 934 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 20:08:09,405 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [219 Valid, 160 Invalid, 949 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 934 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 20:08:09,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2023-12-02 20:08:09,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2023-12-02 20:08:09,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 68 states have (on average 1.088235294117647) internal successors, (74), 68 states have internal predecessors, (74), 0 states have call successors, (0), 0 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 20:08:09,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 74 transitions. [2023-12-02 20:08:09,408 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 74 transitions. Word has length 53 [2023-12-02 20:08:09,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:08:09,408 INFO L495 AbstractCegarLoop]: Abstraction has 69 states and 74 transitions. [2023-12-02 20:08:09,409 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 2.4705882352941178) internal successors, (126), 50 states have internal predecessors, (126), 0 states have call successors, (0), 0 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 20:08:09,409 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 74 transitions. [2023-12-02 20:08:09,409 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2023-12-02 20:08:09,409 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:08:09,409 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 9, 7, 7, 1, 1, 1, 1] [2023-12-02 20:08:09,414 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2023-12-02 20:08:09,610 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2023-12-02 20:08:09,610 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-12-02 20:08:09,610 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:08:09,610 INFO L85 PathProgramCache]: Analyzing trace with hash 23168935, now seen corresponding path program 11 times [2023-12-02 20:08:09,610 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:08:09,611 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [52884099] [2023-12-02 20:08:09,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:08:09,611 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:08:09,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:08:09,983 INFO L134 CoverageAnalysis]: Checked inductivity of 211 backedges. 70 proven. 133 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-12-02 20:08:09,984 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:08:09,984 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [52884099] [2023-12-02 20:08:09,984 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [52884099] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 20:08:09,984 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1604541919] [2023-12-02 20:08:09,984 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 20:08:09,984 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:08:09,984 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:08:09,985 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:08:09,986 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-12-02 20:08:10,805 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2023-12-02 20:08:10,805 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 20:08:10,808 INFO L262 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 78 conjunts are in the unsatisfiable core [2023-12-02 20:08:10,811 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:08:10,819 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 20:08:11,535 INFO L134 CoverageAnalysis]: Checked inductivity of 211 backedges. 154 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:08:11,535 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:08:12,279 INFO L134 CoverageAnalysis]: Checked inductivity of 211 backedges. 154 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:08:12,279 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1604541919] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 20:08:12,279 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1602010701] [2023-12-02 20:08:12,280 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-12-02 20:08:12,280 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 20:08:12,280 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 20:08:12,281 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 20:08:12,281 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 20:08:12,952 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 20:08:13,733 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3785#(and (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) |ULTIMATE.start_cmemchr_#t~post3#1.offset|))' at error location [2023-12-02 20:08:13,733 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 20:08:13,733 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 20:08:13,733 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 21, 21] total 58 [2023-12-02 20:08:13,733 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1221376941] [2023-12-02 20:08:13,733 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 20:08:13,734 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2023-12-02 20:08:13,734 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:08:13,735 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2023-12-02 20:08:13,736 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=371, Invalid=4051, Unknown=0, NotChecked=0, Total=4422 [2023-12-02 20:08:13,736 INFO L87 Difference]: Start difference. First operand 69 states and 74 transitions. Second operand has 59 states, 59 states have (on average 2.5762711864406778) internal successors, (152), 58 states have internal predecessors, (152), 0 states have call successors, (0), 0 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 20:08:15,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:08:15,546 INFO L93 Difference]: Finished difference Result 133 states and 136 transitions. [2023-12-02 20:08:15,547 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2023-12-02 20:08:15,547 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 2.5762711864406778) internal successors, (152), 58 states have internal predecessors, (152), 0 states have call successors, (0), 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 55 [2023-12-02 20:08:15,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:08:15,548 INFO L225 Difference]: With dead ends: 133 [2023-12-02 20:08:15,548 INFO L226 Difference]: Without dead ends: 69 [2023-12-02 20:08:15,551 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 216 GetRequests, 116 SyntacticMatches, 0 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1910 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=1202, Invalid=9100, Unknown=0, NotChecked=0, Total=10302 [2023-12-02 20:08:15,552 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 72 mSDsluCounter, 199 mSDsCounter, 0 mSdLazyCounter, 1088 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 207 SdHoareTripleChecker+Invalid, 1102 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 1088 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-12-02 20:08:15,552 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [72 Valid, 207 Invalid, 1102 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 1088 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-12-02 20:08:15,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2023-12-02 20:08:15,555 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2023-12-02 20:08:15,556 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 68 states have (on average 1.0588235294117647) internal successors, (72), 68 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:08:15,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 72 transitions. [2023-12-02 20:08:15,556 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 72 transitions. Word has length 55 [2023-12-02 20:08:15,556 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:08:15,556 INFO L495 AbstractCegarLoop]: Abstraction has 69 states and 72 transitions. [2023-12-02 20:08:15,557 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 2.5762711864406778) internal successors, (152), 58 states have internal predecessors, (152), 0 states have call successors, (0), 0 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 20:08:15,557 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 72 transitions. [2023-12-02 20:08:15,558 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2023-12-02 20:08:15,558 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:08:15,558 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 1, 1, 1, 1] [2023-12-02 20:08:15,563 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2023-12-02 20:08:15,758 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2023-12-02 20:08:15,758 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-12-02 20:08:15,759 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:08:15,759 INFO L85 PathProgramCache]: Analyzing trace with hash -2122893749, now seen corresponding path program 12 times [2023-12-02 20:08:15,759 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:08:15,759 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1249117977] [2023-12-02 20:08:15,759 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:08:15,759 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:08:15,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:08:16,269 INFO L134 CoverageAnalysis]: Checked inductivity of 243 backedges. 18 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:08:16,270 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:08:16,270 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1249117977] [2023-12-02 20:08:16,270 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1249117977] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 20:08:16,270 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2104482826] [2023-12-02 20:08:16,270 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 20:08:16,270 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:08:16,270 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:08:16,271 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:08:16,272 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-12-02 20:08:16,445 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 20:08:16,445 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 20:08:16,449 INFO L262 TraceCheckSpWp]: Trace formula consists of 360 conjuncts, 44 conjunts are in the unsatisfiable core [2023-12-02 20:08:16,451 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:08:16,535 INFO L134 CoverageAnalysis]: Checked inductivity of 243 backedges. 18 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:08:16,535 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:08:17,187 INFO L134 CoverageAnalysis]: Checked inductivity of 243 backedges. 18 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:08:17,187 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2104482826] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 20:08:17,187 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1234503605] [2023-12-02 20:08:17,189 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-12-02 20:08:17,189 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 20:08:17,189 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 20:08:17,189 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 20:08:17,189 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 20:08:18,014 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 20:08:18,595 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4459#(or (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (< |ULTIMATE.start_cmemchr_#t~post3#1.offset| 0))' at error location [2023-12-02 20:08:18,595 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 20:08:18,595 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 20:08:18,595 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 45 [2023-12-02 20:08:18,595 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [88239099] [2023-12-02 20:08:18,595 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 20:08:18,596 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2023-12-02 20:08:18,596 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:08:18,597 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2023-12-02 20:08:18,597 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=2619, Unknown=0, NotChecked=0, Total=2756 [2023-12-02 20:08:18,597 INFO L87 Difference]: Start difference. First operand 69 states and 72 transitions. Second operand has 46 states, 46 states have (on average 2.608695652173913) internal successors, (120), 45 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:08:19,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:08:19,531 INFO L93 Difference]: Finished difference Result 106 states and 108 transitions. [2023-12-02 20:08:19,531 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2023-12-02 20:08:19,531 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 2.608695652173913) internal successors, (120), 45 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 59 [2023-12-02 20:08:19,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:08:19,532 INFO L225 Difference]: With dead ends: 106 [2023-12-02 20:08:19,532 INFO L226 Difference]: Without dead ends: 69 [2023-12-02 20:08:19,533 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 146 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 682 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=238, Invalid=4732, Unknown=0, NotChecked=0, Total=4970 [2023-12-02 20:08:19,533 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 38 mSDsluCounter, 729 mSDsCounter, 0 mSdLazyCounter, 880 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 756 SdHoareTripleChecker+Invalid, 890 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 880 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 20:08:19,533 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [38 Valid, 756 Invalid, 890 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 880 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 20:08:19,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2023-12-02 20:08:19,536 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2023-12-02 20:08:19,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 68 states have (on average 1.0441176470588236) internal successors, (71), 68 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:08:19,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 71 transitions. [2023-12-02 20:08:19,536 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 71 transitions. Word has length 59 [2023-12-02 20:08:19,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:08:19,537 INFO L495 AbstractCegarLoop]: Abstraction has 69 states and 71 transitions. [2023-12-02 20:08:19,537 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 2.608695652173913) internal successors, (120), 45 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:08:19,537 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 71 transitions. [2023-12-02 20:08:19,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2023-12-02 20:08:19,538 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:08:19,538 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 10, 9, 9, 9, 1, 1, 1, 1] [2023-12-02 20:08:19,545 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2023-12-02 20:08:19,738 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2023-12-02 20:08:19,739 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-12-02 20:08:19,739 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:08:19,739 INFO L85 PathProgramCache]: Analyzing trace with hash -1945308433, now seen corresponding path program 13 times [2023-12-02 20:08:19,739 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:08:19,739 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1104782258] [2023-12-02 20:08:19,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:08:19,739 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:08:19,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:08:20,571 INFO L134 CoverageAnalysis]: Checked inductivity of 283 backedges. 110 proven. 173 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:08:20,571 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:08:20,571 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1104782258] [2023-12-02 20:08:20,571 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1104782258] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 20:08:20,571 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [44588535] [2023-12-02 20:08:20,571 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 20:08:20,572 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:08:20,572 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:08:20,572 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:08:20,575 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2023-12-02 20:08:20,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:08:20,678 INFO L262 TraceCheckSpWp]: Trace formula consists of 386 conjuncts, 100 conjunts are in the unsatisfiable core [2023-12-02 20:08:20,680 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:08:21,070 INFO L134 CoverageAnalysis]: Checked inductivity of 283 backedges. 110 proven. 173 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:08:21,070 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:08:21,583 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2023-12-02 20:08:21,800 INFO L134 CoverageAnalysis]: Checked inductivity of 283 backedges. 110 proven. 173 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:08:21,800 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [44588535] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 20:08:21,800 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [256533938] [2023-12-02 20:08:21,802 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-12-02 20:08:21,802 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 20:08:21,802 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 20:08:21,802 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 20:08:21,802 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 20:08:22,526 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 20:08:23,282 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5106#(and (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) |ULTIMATE.start_cmemchr_#t~post3#1.offset|))' at error location [2023-12-02 20:08:23,283 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 20:08:23,283 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 20:08:23,283 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 55 [2023-12-02 20:08:23,283 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [497953571] [2023-12-02 20:08:23,283 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 20:08:23,283 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2023-12-02 20:08:23,284 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:08:23,284 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2023-12-02 20:08:23,284 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=426, Invalid=3734, Unknown=0, NotChecked=0, Total=4160 [2023-12-02 20:08:23,285 INFO L87 Difference]: Start difference. First operand 69 states and 71 transitions. Second operand has 57 states, 56 states have (on average 2.392857142857143) internal successors, (134), 56 states have internal predecessors, (134), 0 states have call successors, (0), 0 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 20:08:25,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:08:25,654 INFO L93 Difference]: Finished difference Result 117 states and 119 transitions. [2023-12-02 20:08:25,654 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2023-12-02 20:08:25,654 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 56 states have (on average 2.392857142857143) internal successors, (134), 56 states have internal predecessors, (134), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 63 [2023-12-02 20:08:25,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:08:25,655 INFO L225 Difference]: With dead ends: 117 [2023-12-02 20:08:25,655 INFO L226 Difference]: Without dead ends: 117 [2023-12-02 20:08:25,656 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 259 GetRequests, 139 SyntacticMatches, 10 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3967 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=1259, Invalid=11173, Unknown=0, NotChecked=0, Total=12432 [2023-12-02 20:08:25,656 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 192 mSDsluCounter, 261 mSDsCounter, 0 mSdLazyCounter, 1692 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 192 SdHoareTripleChecker+Valid, 271 SdHoareTripleChecker+Invalid, 1702 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1692 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-12-02 20:08:25,657 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [192 Valid, 271 Invalid, 1702 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1692 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-12-02 20:08:25,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2023-12-02 20:08:25,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 73. [2023-12-02 20:08:25,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 72 states have (on average 1.0416666666666667) internal successors, (75), 72 states have internal predecessors, (75), 0 states have call successors, (0), 0 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 20:08:25,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 75 transitions. [2023-12-02 20:08:25,660 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 75 transitions. Word has length 63 [2023-12-02 20:08:25,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:08:25,661 INFO L495 AbstractCegarLoop]: Abstraction has 73 states and 75 transitions. [2023-12-02 20:08:25,661 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 56 states have (on average 2.392857142857143) internal successors, (134), 56 states have internal predecessors, (134), 0 states have call successors, (0), 0 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 20:08:25,661 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 75 transitions. [2023-12-02 20:08:25,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2023-12-02 20:08:25,662 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:08:25,662 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 10, 10, 10, 1, 1, 1, 1] [2023-12-02 20:08:25,668 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2023-12-02 20:08:25,862 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:08:25,863 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-12-02 20:08:25,863 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:08:25,863 INFO L85 PathProgramCache]: Analyzing trace with hash 783422539, now seen corresponding path program 14 times [2023-12-02 20:08:25,863 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:08:25,863 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1338260975] [2023-12-02 20:08:25,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:08:25,863 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:08:25,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:08:26,407 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 20 proven. 280 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:08:26,408 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:08:26,408 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1338260975] [2023-12-02 20:08:26,408 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1338260975] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 20:08:26,408 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1850915129] [2023-12-02 20:08:26,408 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 20:08:26,408 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:08:26,408 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:08:26,409 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:08:26,410 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2023-12-02 20:08:27,195 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2023-12-02 20:08:27,195 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 20:08:27,198 INFO L262 TraceCheckSpWp]: Trace formula consists of 393 conjuncts, 48 conjunts are in the unsatisfiable core [2023-12-02 20:08:27,200 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:08:27,287 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 20 proven. 280 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:08:27,287 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:08:28,035 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 20 proven. 280 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:08:28,036 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1850915129] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 20:08:28,036 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [348526335] [2023-12-02 20:08:28,037 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-12-02 20:08:28,037 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 20:08:28,037 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 20:08:28,037 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 20:08:28,037 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 20:08:28,895 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 20:08:29,625 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5832#(or (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (< |ULTIMATE.start_cmemchr_#t~post3#1.offset| 0))' at error location [2023-12-02 20:08:29,625 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 20:08:29,625 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 20:08:29,625 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 49 [2023-12-02 20:08:29,625 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1798477616] [2023-12-02 20:08:29,625 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 20:08:29,626 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2023-12-02 20:08:29,626 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:08:29,626 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2023-12-02 20:08:29,626 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=3045, Unknown=0, NotChecked=0, Total=3192 [2023-12-02 20:08:29,627 INFO L87 Difference]: Start difference. First operand 73 states and 75 transitions. Second operand has 50 states, 50 states have (on average 2.64) internal successors, (132), 49 states have internal predecessors, (132), 0 states have call successors, (0), 0 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 20:08:30,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:08:30,782 INFO L93 Difference]: Finished difference Result 114 states and 115 transitions. [2023-12-02 20:08:30,782 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2023-12-02 20:08:30,782 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 2.64) internal successors, (132), 49 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 65 [2023-12-02 20:08:30,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:08:30,783 INFO L225 Difference]: With dead ends: 114 [2023-12-02 20:08:30,783 INFO L226 Difference]: Without dead ends: 73 [2023-12-02 20:08:30,784 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 237 GetRequests, 162 SyntacticMatches, 0 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 790 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=259, Invalid=5593, Unknown=0, NotChecked=0, Total=5852 [2023-12-02 20:08:30,784 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 83 mSDsluCounter, 1031 mSDsCounter, 0 mSdLazyCounter, 1237 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 1061 SdHoareTripleChecker+Invalid, 1249 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 1237 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-12-02 20:08:30,785 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [83 Valid, 1061 Invalid, 1249 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 1237 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-12-02 20:08:30,785 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2023-12-02 20:08:30,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 72. [2023-12-02 20:08:30,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 71 states have (on average 1.028169014084507) internal successors, (73), 71 states have internal predecessors, (73), 0 states have call successors, (0), 0 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 20:08:30,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 73 transitions. [2023-12-02 20:08:30,787 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 73 transitions. Word has length 65 [2023-12-02 20:08:30,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:08:30,787 INFO L495 AbstractCegarLoop]: Abstraction has 72 states and 73 transitions. [2023-12-02 20:08:30,787 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 2.64) internal successors, (132), 49 states have internal predecessors, (132), 0 states have call successors, (0), 0 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 20:08:30,787 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 73 transitions. [2023-12-02 20:08:30,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2023-12-02 20:08:30,788 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:08:30,788 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 11, 11, 11, 1, 1, 1, 1] [2023-12-02 20:08:30,793 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2023-12-02 20:08:30,988 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:08:30,988 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-12-02 20:08:30,989 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:08:30,989 INFO L85 PathProgramCache]: Analyzing trace with hash 1602845899, now seen corresponding path program 15 times [2023-12-02 20:08:30,989 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:08:30,989 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1037225018] [2023-12-02 20:08:30,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:08:30,989 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:08:31,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:08:31,625 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 22 proven. 341 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:08:31,626 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:08:31,626 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1037225018] [2023-12-02 20:08:31,626 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1037225018] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 20:08:31,626 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1353333789] [2023-12-02 20:08:31,626 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 20:08:31,626 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:08:31,626 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:08:31,627 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:08:31,628 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2023-12-02 20:08:31,841 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 20:08:31,841 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 20:08:31,845 INFO L262 TraceCheckSpWp]: Trace formula consists of 426 conjuncts, 52 conjunts are in the unsatisfiable core [2023-12-02 20:08:31,847 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:08:31,938 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 22 proven. 341 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:08:31,938 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:08:32,837 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 22 proven. 341 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:08:32,838 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1353333789] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 20:08:32,838 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [21359635] [2023-12-02 20:08:32,839 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-12-02 20:08:32,839 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 20:08:32,839 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 20:08:32,839 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 20:08:32,839 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 20:08:33,503 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 20:08:34,375 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6539#(and (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) |ULTIMATE.start_cmemchr_#t~post3#1.offset|))' at error location [2023-12-02 20:08:34,375 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 20:08:34,376 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 20:08:34,376 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 53 [2023-12-02 20:08:34,376 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [87144897] [2023-12-02 20:08:34,376 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 20:08:34,376 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2023-12-02 20:08:34,376 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:08:34,377 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2023-12-02 20:08:34,377 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=3621, Unknown=0, NotChecked=0, Total=3782 [2023-12-02 20:08:34,377 INFO L87 Difference]: Start difference. First operand 72 states and 73 transitions. Second operand has 54 states, 54 states have (on average 2.6666666666666665) internal successors, (144), 53 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 20:08:35,744 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:08:35,744 INFO L93 Difference]: Finished difference Result 120 states and 121 transitions. [2023-12-02 20:08:35,744 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2023-12-02 20:08:35,745 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 2.6666666666666665) internal successors, (144), 53 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 71 [2023-12-02 20:08:35,745 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:08:35,745 INFO L225 Difference]: With dead ends: 120 [2023-12-02 20:08:35,745 INFO L226 Difference]: Without dead ends: 75 [2023-12-02 20:08:35,746 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 259 GetRequests, 177 SyntacticMatches, 0 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 961 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=284, Invalid=6688, Unknown=0, NotChecked=0, Total=6972 [2023-12-02 20:08:35,747 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 90 mSDsluCounter, 1103 mSDsCounter, 0 mSdLazyCounter, 1320 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 90 SdHoareTripleChecker+Valid, 1136 SdHoareTripleChecker+Invalid, 1333 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 1320 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-12-02 20:08:35,747 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [90 Valid, 1136 Invalid, 1333 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 1320 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-12-02 20:08:35,747 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2023-12-02 20:08:35,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 74. [2023-12-02 20:08:35,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 73 states have (on average 1.0273972602739727) internal successors, (75), 73 states have internal predecessors, (75), 0 states have call successors, (0), 0 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 20:08:35,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 75 transitions. [2023-12-02 20:08:35,750 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 75 transitions. Word has length 71 [2023-12-02 20:08:35,754 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:08:35,754 INFO L495 AbstractCegarLoop]: Abstraction has 74 states and 75 transitions. [2023-12-02 20:08:35,754 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 54 states have (on average 2.6666666666666665) internal successors, (144), 53 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 20:08:35,754 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 75 transitions. [2023-12-02 20:08:35,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2023-12-02 20:08:35,755 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:08:35,755 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 12, 11, 11, 11, 1, 1, 1, 1] [2023-12-02 20:08:35,761 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2023-12-02 20:08:35,956 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2023-12-02 20:08:35,956 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-12-02 20:08:35,956 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:08:35,956 INFO L85 PathProgramCache]: Analyzing trace with hash -1915978147, now seen corresponding path program 16 times [2023-12-02 20:08:35,956 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:08:35,956 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [795238650] [2023-12-02 20:08:35,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:08:35,957 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:08:35,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:08:37,245 INFO L134 CoverageAnalysis]: Checked inductivity of 386 backedges. 132 proven. 254 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:08:37,246 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:08:37,246 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [795238650] [2023-12-02 20:08:37,246 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [795238650] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 20:08:37,246 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1795136050] [2023-12-02 20:08:37,246 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 20:08:37,246 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:08:37,246 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:08:37,247 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:08:37,249 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2023-12-02 20:08:37,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:08:37,378 INFO L262 TraceCheckSpWp]: Trace formula consists of 439 conjuncts, 117 conjunts are in the unsatisfiable core [2023-12-02 20:08:37,380 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:08:37,873 INFO L134 CoverageAnalysis]: Checked inductivity of 386 backedges. 132 proven. 254 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:08:37,873 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:08:38,529 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2023-12-02 20:08:38,834 INFO L134 CoverageAnalysis]: Checked inductivity of 386 backedges. 132 proven. 254 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:08:38,835 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1795136050] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 20:08:38,835 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [153103265] [2023-12-02 20:08:38,836 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-12-02 20:08:38,836 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 20:08:38,836 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 20:08:38,836 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 20:08:38,837 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 20:08:39,659 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 20:08:40,338 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7279#(or (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (< |ULTIMATE.start_cmemchr_#t~post3#1.offset| 0))' at error location [2023-12-02 20:08:40,338 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 20:08:40,338 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 20:08:40,338 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 60 [2023-12-02 20:08:40,338 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2133472426] [2023-12-02 20:08:40,338 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 20:08:40,338 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 62 states [2023-12-02 20:08:40,339 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:08:40,339 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2023-12-02 20:08:40,339 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=453, Invalid=4239, Unknown=0, NotChecked=0, Total=4692 [2023-12-02 20:08:40,340 INFO L87 Difference]: Start difference. First operand 74 states and 75 transitions. Second operand has 62 states, 61 states have (on average 2.4754098360655736) internal successors, (151), 61 states have internal predecessors, (151), 0 states have call successors, (0), 0 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 20:08:42,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:08:42,167 INFO L93 Difference]: Finished difference Result 80 states and 81 transitions. [2023-12-02 20:08:42,167 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2023-12-02 20:08:42,167 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 61 states have (on average 2.4754098360655736) internal successors, (151), 61 states have internal predecessors, (151), 0 states have call successors, (0), 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 73 [2023-12-02 20:08:42,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:08:42,168 INFO L225 Difference]: With dead ends: 80 [2023-12-02 20:08:42,168 INFO L226 Difference]: Without dead ends: 80 [2023-12-02 20:08:42,169 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 272 GetRequests, 166 SyntacticMatches, 12 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3229 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=925, Invalid=8195, Unknown=0, NotChecked=0, Total=9120 [2023-12-02 20:08:42,169 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 177 mSDsluCounter, 241 mSDsCounter, 0 mSdLazyCounter, 1562 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 177 SdHoareTripleChecker+Valid, 252 SdHoareTripleChecker+Invalid, 1563 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 1562 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-12-02 20:08:42,169 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [177 Valid, 252 Invalid, 1563 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 1562 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-12-02 20:08:42,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2023-12-02 20:08:42,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 78. [2023-12-02 20:08:42,171 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 77 states have (on average 1.025974025974026) internal successors, (79), 77 states have internal predecessors, (79), 0 states have call successors, (0), 0 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 20:08:42,171 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 79 transitions. [2023-12-02 20:08:42,171 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 79 transitions. Word has length 73 [2023-12-02 20:08:42,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:08:42,171 INFO L495 AbstractCegarLoop]: Abstraction has 78 states and 79 transitions. [2023-12-02 20:08:42,172 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 62 states, 61 states have (on average 2.4754098360655736) internal successors, (151), 61 states have internal predecessors, (151), 0 states have call successors, (0), 0 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 20:08:42,172 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 79 transitions. [2023-12-02 20:08:42,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2023-12-02 20:08:42,172 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:08:42,172 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 12, 12, 12, 1, 1, 1, 1] [2023-12-02 20:08:42,177 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2023-12-02 20:08:42,372 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:08:42,373 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-12-02 20:08:42,373 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:08:42,373 INFO L85 PathProgramCache]: Analyzing trace with hash -1132310581, now seen corresponding path program 17 times [2023-12-02 20:08:42,373 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:08:42,373 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [622350775] [2023-12-02 20:08:42,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:08:42,373 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:08:42,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:08:43,080 INFO L134 CoverageAnalysis]: Checked inductivity of 432 backedges. 24 proven. 408 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:08:43,080 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:08:43,080 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [622350775] [2023-12-02 20:08:43,080 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [622350775] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 20:08:43,080 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [812575804] [2023-12-02 20:08:43,080 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 20:08:43,081 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:08:43,081 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:08:43,081 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:08:43,082 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2023-12-02 20:08:43,662 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2023-12-02 20:08:43,662 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 20:08:43,666 INFO L262 TraceCheckSpWp]: Trace formula consists of 459 conjuncts, 56 conjunts are in the unsatisfiable core [2023-12-02 20:08:43,668 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:08:43,789 INFO L134 CoverageAnalysis]: Checked inductivity of 432 backedges. 24 proven. 408 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:08:43,789 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:08:44,755 INFO L134 CoverageAnalysis]: Checked inductivity of 432 backedges. 24 proven. 408 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:08:44,755 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [812575804] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 20:08:44,755 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1164755504] [2023-12-02 20:08:44,756 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-12-02 20:08:44,756 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 20:08:44,757 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 20:08:44,757 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 20:08:44,757 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 20:08:45,562 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 20:08:46,393 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8012#(or (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (< |ULTIMATE.start_cmemchr_#t~post3#1.offset| 0))' at error location [2023-12-02 20:08:46,393 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 20:08:46,393 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 20:08:46,393 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 57 [2023-12-02 20:08:46,393 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1727279590] [2023-12-02 20:08:46,393 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 20:08:46,394 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2023-12-02 20:08:46,394 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:08:46,395 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2023-12-02 20:08:46,395 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=3993, Unknown=0, NotChecked=0, Total=4160 [2023-12-02 20:08:46,395 INFO L87 Difference]: Start difference. First operand 78 states and 79 transitions. Second operand has 58 states, 58 states have (on average 2.689655172413793) internal successors, (156), 57 states have internal predecessors, (156), 0 states have call successors, (0), 0 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 20:08:48,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:08:48,044 INFO L93 Difference]: Finished difference Result 130 states and 131 transitions. [2023-12-02 20:08:48,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2023-12-02 20:08:48,045 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 2.689655172413793) internal successors, (156), 57 states have internal predecessors, (156), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 77 [2023-12-02 20:08:48,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:08:48,045 INFO L225 Difference]: With dead ends: 130 [2023-12-02 20:08:48,046 INFO L226 Difference]: Without dead ends: 81 [2023-12-02 20:08:48,046 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 281 GetRequests, 194 SyntacticMatches, 0 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1030 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=301, Invalid=7531, Unknown=0, NotChecked=0, Total=7832 [2023-12-02 20:08:48,046 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 99 mSDsluCounter, 1516 mSDsCounter, 0 mSdLazyCounter, 1775 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 99 SdHoareTripleChecker+Valid, 1552 SdHoareTripleChecker+Invalid, 1789 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 1775 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-12-02 20:08:48,047 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [99 Valid, 1552 Invalid, 1789 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 1775 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-12-02 20:08:48,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2023-12-02 20:08:48,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 80. [2023-12-02 20:08:48,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 79 states have (on average 1.0253164556962024) internal successors, (81), 79 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 20:08:48,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 81 transitions. [2023-12-02 20:08:48,048 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 81 transitions. Word has length 77 [2023-12-02 20:08:48,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:08:48,049 INFO L495 AbstractCegarLoop]: Abstraction has 80 states and 81 transitions. [2023-12-02 20:08:48,049 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 58 states have (on average 2.689655172413793) internal successors, (156), 57 states have internal predecessors, (156), 0 states have call successors, (0), 0 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 20:08:48,049 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 81 transitions. [2023-12-02 20:08:48,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2023-12-02 20:08:48,049 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:08:48,049 INFO L195 NwaCegarLoop]: trace histogram [13, 13, 13, 12, 12, 12, 1, 1, 1, 1] [2023-12-02 20:08:48,055 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2023-12-02 20:08:48,250 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:08:48,250 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-12-02 20:08:48,250 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:08:48,251 INFO L85 PathProgramCache]: Analyzing trace with hash -32613411, now seen corresponding path program 18 times [2023-12-02 20:08:48,251 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:08:48,251 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [349843714] [2023-12-02 20:08:48,251 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:08:48,251 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:08:48,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:08:49,433 INFO L134 CoverageAnalysis]: Checked inductivity of 457 backedges. 156 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:08:49,433 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:08:49,433 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [349843714] [2023-12-02 20:08:49,434 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [349843714] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 20:08:49,434 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [606339766] [2023-12-02 20:08:49,434 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 20:08:49,434 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:08:49,434 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:08:49,435 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:08:49,436 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2023-12-02 20:08:49,709 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 20:08:49,709 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 20:08:49,713 INFO L262 TraceCheckSpWp]: Trace formula consists of 472 conjuncts, 132 conjunts are in the unsatisfiable core [2023-12-02 20:08:49,715 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:08:49,721 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 20:08:50,259 INFO L134 CoverageAnalysis]: Checked inductivity of 457 backedges. 156 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:08:50,259 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:08:51,663 INFO L134 CoverageAnalysis]: Checked inductivity of 457 backedges. 169 proven. 288 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:08:51,663 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [606339766] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 20:08:51,663 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1599950559] [2023-12-02 20:08:51,664 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-12-02 20:08:51,664 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 20:08:51,665 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 20:08:51,665 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 20:08:51,665 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 20:08:52,489 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 20:08:53,373 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8822#(or (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (< |ULTIMATE.start_cmemchr_#t~post3#1.offset| 0))' at error location [2023-12-02 20:08:53,373 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 20:08:53,373 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 20:08:53,373 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29, 29] total 75 [2023-12-02 20:08:53,373 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [929718402] [2023-12-02 20:08:53,373 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 20:08:53,374 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 77 states [2023-12-02 20:08:53,374 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:08:53,375 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2023-12-02 20:08:53,375 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=844, Invalid=6128, Unknown=0, NotChecked=0, Total=6972 [2023-12-02 20:08:53,376 INFO L87 Difference]: Start difference. First operand 80 states and 81 transitions. Second operand has 77 states, 76 states have (on average 2.486842105263158) internal successors, (189), 76 states have internal predecessors, (189), 0 states have call successors, (0), 0 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 20:08:55,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:08:55,075 INFO L93 Difference]: Finished difference Result 86 states and 87 transitions. [2023-12-02 20:08:55,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2023-12-02 20:08:55,076 INFO L78 Accepts]: Start accepts. Automaton has has 77 states, 76 states have (on average 2.486842105263158) internal successors, (189), 76 states have internal predecessors, (189), 0 states have call successors, (0), 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 79 [2023-12-02 20:08:55,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:08:55,076 INFO L225 Difference]: With dead ends: 86 [2023-12-02 20:08:55,076 INFO L226 Difference]: Without dead ends: 86 [2023-12-02 20:08:55,077 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 294 GetRequests, 183 SyntacticMatches, 0 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3809 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=1739, Invalid=10917, Unknown=0, NotChecked=0, Total=12656 [2023-12-02 20:08:55,078 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 247 mSDsluCounter, 272 mSDsCounter, 0 mSdLazyCounter, 1758 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 247 SdHoareTripleChecker+Valid, 284 SdHoareTripleChecker+Invalid, 1760 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 1758 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-12-02 20:08:55,078 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [247 Valid, 284 Invalid, 1760 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 1758 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-12-02 20:08:55,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2023-12-02 20:08:55,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 84. [2023-12-02 20:08:55,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 83 states have (on average 1.0240963855421688) internal successors, (85), 83 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:08:55,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 85 transitions. [2023-12-02 20:08:55,080 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 85 transitions. Word has length 79 [2023-12-02 20:08:55,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:08:55,080 INFO L495 AbstractCegarLoop]: Abstraction has 84 states and 85 transitions. [2023-12-02 20:08:55,080 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 77 states, 76 states have (on average 2.486842105263158) internal successors, (189), 76 states have internal predecessors, (189), 0 states have call successors, (0), 0 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 20:08:55,080 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 85 transitions. [2023-12-02 20:08:55,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2023-12-02 20:08:55,081 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:08:55,081 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 13, 13, 13, 1, 1, 1, 1] [2023-12-02 20:08:55,086 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2023-12-02 20:08:55,281 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:08:55,281 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-12-02 20:08:55,282 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:08:55,282 INFO L85 PathProgramCache]: Analyzing trace with hash 1436118347, now seen corresponding path program 19 times [2023-12-02 20:08:55,282 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:08:55,282 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1320771096] [2023-12-02 20:08:55,282 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:08:55,282 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:08:55,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:08:56,210 INFO L134 CoverageAnalysis]: Checked inductivity of 507 backedges. 26 proven. 481 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:08:56,210 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:08:56,211 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1320771096] [2023-12-02 20:08:56,211 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1320771096] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 20:08:56,211 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1023664731] [2023-12-02 20:08:56,211 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 20:08:56,211 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:08:56,211 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:08:56,212 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:08:56,213 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2023-12-02 20:08:56,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:08:56,442 INFO L262 TraceCheckSpWp]: Trace formula consists of 492 conjuncts, 60 conjunts are in the unsatisfiable core [2023-12-02 20:08:56,443 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:08:56,573 INFO L134 CoverageAnalysis]: Checked inductivity of 507 backedges. 26 proven. 481 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:08:56,573 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:08:57,697 INFO L134 CoverageAnalysis]: Checked inductivity of 507 backedges. 26 proven. 481 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:08:57,697 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1023664731] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 20:08:57,697 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1564203653] [2023-12-02 20:08:57,698 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-12-02 20:08:57,698 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 20:08:57,698 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 20:08:57,699 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 20:08:57,699 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 20:08:58,569 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 20:08:59,418 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9611#(or (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (< |ULTIMATE.start_cmemchr_#t~post3#1.offset| 0))' at error location [2023-12-02 20:08:59,418 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 20:08:59,418 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 20:08:59,418 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 61 [2023-12-02 20:08:59,418 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [106752861] [2023-12-02 20:08:59,418 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 20:08:59,419 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 62 states [2023-12-02 20:08:59,419 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:08:59,419 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2023-12-02 20:08:59,419 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=4515, Unknown=0, NotChecked=0, Total=4692 [2023-12-02 20:08:59,420 INFO L87 Difference]: Start difference. First operand 84 states and 85 transitions. Second operand has 62 states, 62 states have (on average 2.7096774193548385) internal successors, (168), 61 states have internal predecessors, (168), 0 states have call successors, (0), 0 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 20:09:01,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:09:01,128 INFO L93 Difference]: Finished difference Result 140 states and 141 transitions. [2023-12-02 20:09:01,128 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2023-12-02 20:09:01,129 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 2.7096774193548385) internal successors, (168), 61 states have internal predecessors, (168), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 83 [2023-12-02 20:09:01,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:09:01,129 INFO L225 Difference]: With dead ends: 140 [2023-12-02 20:09:01,130 INFO L226 Difference]: Without dead ends: 87 [2023-12-02 20:09:01,130 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 303 GetRequests, 210 SyntacticMatches, 0 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1162 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=322, Invalid=8608, Unknown=0, NotChecked=0, Total=8930 [2023-12-02 20:09:01,131 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 54 mSDsluCounter, 1607 mSDsCounter, 0 mSdLazyCounter, 1898 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 1646 SdHoareTripleChecker+Invalid, 1912 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 1898 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-12-02 20:09:01,131 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [54 Valid, 1646 Invalid, 1912 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 1898 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-12-02 20:09:01,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2023-12-02 20:09:01,133 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 86. [2023-12-02 20:09:01,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 85 states have (on average 1.0235294117647058) internal successors, (87), 85 states have internal predecessors, (87), 0 states have call successors, (0), 0 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 20:09:01,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 87 transitions. [2023-12-02 20:09:01,134 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 87 transitions. Word has length 83 [2023-12-02 20:09:01,134 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:09:01,134 INFO L495 AbstractCegarLoop]: Abstraction has 86 states and 87 transitions. [2023-12-02 20:09:01,135 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 62 states, 62 states have (on average 2.7096774193548385) internal successors, (168), 61 states have internal predecessors, (168), 0 states have call successors, (0), 0 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 20:09:01,135 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 87 transitions. [2023-12-02 20:09:01,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2023-12-02 20:09:01,136 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:09:01,136 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 14, 13, 13, 13, 1, 1, 1, 1] [2023-12-02 20:09:01,142 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2023-12-02 20:09:01,336 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2023-12-02 20:09:01,336 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-12-02 20:09:01,337 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:09:01,337 INFO L85 PathProgramCache]: Analyzing trace with hash -1055087651, now seen corresponding path program 20 times [2023-12-02 20:09:01,337 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:09:01,337 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1038314202] [2023-12-02 20:09:01,337 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:09:01,337 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:09:01,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:09:02,479 INFO L134 CoverageAnalysis]: Checked inductivity of 534 backedges. 182 proven. 352 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:09:02,480 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:09:02,480 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1038314202] [2023-12-02 20:09:02,480 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1038314202] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 20:09:02,480 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1527316247] [2023-12-02 20:09:02,480 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 20:09:02,480 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:09:02,480 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:09:02,481 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:09:02,482 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2023-12-02 20:09:04,081 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2023-12-02 20:09:04,081 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 20:09:04,087 INFO L262 TraceCheckSpWp]: Trace formula consists of 492 conjuncts, 175 conjunts are in the unsatisfiable core [2023-12-02 20:09:04,090 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:09:04,105 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 20:09:07,098 INFO L134 CoverageAnalysis]: Checked inductivity of 534 backedges. 13 proven. 377 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2023-12-02 20:09:07,098 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:09:15,506 INFO L134 CoverageAnalysis]: Checked inductivity of 534 backedges. 38 proven. 352 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2023-12-02 20:09:15,506 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1527316247] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 20:09:15,506 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1425944163] [2023-12-02 20:09:15,507 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-12-02 20:09:15,507 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 20:09:15,507 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 20:09:15,507 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 20:09:15,507 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 20:09:16,317 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 20:09:17,885 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10508#(or (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (< |ULTIMATE.start_cmemchr_#t~post3#1.offset| 0))' at error location [2023-12-02 20:09:17,885 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 20:09:17,885 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 20:09:17,885 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 37, 37] total 106 [2023-12-02 20:09:17,885 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1937523491] [2023-12-02 20:09:17,885 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 20:09:17,886 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 108 states [2023-12-02 20:09:17,886 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:09:17,887 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 108 interpolants. [2023-12-02 20:09:17,887 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1260, Invalid=11850, Unknown=0, NotChecked=0, Total=13110 [2023-12-02 20:09:17,888 INFO L87 Difference]: Start difference. First operand 86 states and 87 transitions. Second operand has 108 states, 107 states have (on average 1.97196261682243) internal successors, (211), 107 states have internal predecessors, (211), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:09:46,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:09:46,085 INFO L93 Difference]: Finished difference Result 143 states and 144 transitions. [2023-12-02 20:09:46,085 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2023-12-02 20:09:46,085 INFO L78 Accepts]: Start accepts. Automaton has has 108 states, 107 states have (on average 1.97196261682243) internal successors, (211), 107 states have internal predecessors, (211), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 85 [2023-12-02 20:09:46,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:09:46,086 INFO L225 Difference]: With dead ends: 143 [2023-12-02 20:09:46,086 INFO L226 Difference]: Without dead ends: 143 [2023-12-02 20:09:46,088 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 374 GetRequests, 172 SyntacticMatches, 0 SemanticMatches, 202 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8090 ImplicationChecksByTransitivity, 36.1s TimeCoverageRelationStatistics Valid=4956, Invalid=36456, Unknown=0, NotChecked=0, Total=41412 [2023-12-02 20:09:46,088 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 388 mSDsluCounter, 481 mSDsCounter, 0 mSdLazyCounter, 3435 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 388 SdHoareTripleChecker+Valid, 491 SdHoareTripleChecker+Invalid, 3469 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 3435 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.1s IncrementalHoareTripleChecker+Time [2023-12-02 20:09:46,089 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [388 Valid, 491 Invalid, 3469 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 3435 Invalid, 0 Unknown, 0 Unchecked, 3.1s Time] [2023-12-02 20:09:46,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2023-12-02 20:09:46,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 142. [2023-12-02 20:09:46,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 142 states, 141 states have (on average 1.0141843971631206) internal successors, (143), 141 states have internal predecessors, (143), 0 states have call successors, (0), 0 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 20:09:46,092 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 143 transitions. [2023-12-02 20:09:46,092 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 143 transitions. Word has length 85 [2023-12-02 20:09:46,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:09:46,093 INFO L495 AbstractCegarLoop]: Abstraction has 142 states and 143 transitions. [2023-12-02 20:09:46,093 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 108 states, 107 states have (on average 1.97196261682243) internal successors, (211), 107 states have internal predecessors, (211), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:09:46,093 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 143 transitions. [2023-12-02 20:09:46,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2023-12-02 20:09:46,094 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:09:46,094 INFO L195 NwaCegarLoop]: trace histogram [28, 27, 27, 27, 14, 14, 1, 1, 1, 1] [2023-12-02 20:09:46,100 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2023-12-02 20:09:46,294 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2023-12-02 20:09:46,294 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-12-02 20:09:46,295 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:09:46,295 INFO L85 PathProgramCache]: Analyzing trace with hash -127993119, now seen corresponding path program 21 times [2023-12-02 20:09:46,295 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:09:46,295 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [12575322] [2023-12-02 20:09:46,295 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:09:46,295 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:09:46,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:09:50,867 INFO L134 CoverageAnalysis]: Checked inductivity of 1654 backedges. 0 proven. 1654 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:09:50,867 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:09:50,867 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [12575322] [2023-12-02 20:09:50,867 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [12575322] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 20:09:50,868 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [260749986] [2023-12-02 20:09:50,868 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 20:09:50,868 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:09:50,868 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:09:50,869 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:09:50,869 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2023-12-02 20:09:51,151 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 20:09:51,151 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 20:09:51,158 INFO L262 TraceCheckSpWp]: Trace formula consists of 785 conjuncts, 206 conjunts are in the unsatisfiable core [2023-12-02 20:09:51,162 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:09:51,171 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 20:09:55,192 INFO L134 CoverageAnalysis]: Checked inductivity of 1654 backedges. 1432 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:09:55,192 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:09:59,431 INFO L134 CoverageAnalysis]: Checked inductivity of 1654 backedges. 1432 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:09:59,432 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [260749986] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 20:09:59,432 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2003556583] [2023-12-02 20:09:59,433 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-12-02 20:09:59,433 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 20:09:59,433 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 20:09:59,434 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 20:09:59,434 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 20:10:00,098 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 20:10:01,934 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11958#(and (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) |ULTIMATE.start_cmemchr_#t~post3#1.offset|))' at error location [2023-12-02 20:10:01,934 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 20:10:01,934 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 20:10:01,934 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 46, 46] total 139 [2023-12-02 20:10:01,934 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [160672468] [2023-12-02 20:10:01,934 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 20:10:01,935 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 140 states [2023-12-02 20:10:01,935 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:10:01,936 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 140 interpolants. [2023-12-02 20:10:01,937 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2308, Invalid=19448, Unknown=0, NotChecked=0, Total=21756 [2023-12-02 20:10:01,937 INFO L87 Difference]: Start difference. First operand 142 states and 143 transitions. Second operand has 140 states, 140 states have (on average 2.992857142857143) internal successors, (419), 139 states have internal predecessors, (419), 0 states have call successors, (0), 0 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 20:10:19,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:10:19,040 INFO L93 Difference]: Finished difference Result 334 states and 346 transitions. [2023-12-02 20:10:19,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2023-12-02 20:10:19,040 INFO L78 Accepts]: Start accepts. Automaton has has 140 states, 140 states have (on average 2.992857142857143) internal successors, (419), 139 states have internal predecessors, (419), 0 states have call successors, (0), 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 141 [2023-12-02 20:10:19,040 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:10:19,041 INFO L225 Difference]: With dead ends: 334 [2023-12-02 20:10:19,041 INFO L226 Difference]: Without dead ends: 168 [2023-12-02 20:10:19,043 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 542 GetRequests, 323 SyntacticMatches, 0 SemanticMatches, 219 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9454 ImplicationChecksByTransitivity, 25.2s TimeCoverageRelationStatistics Valid=6496, Invalid=42124, Unknown=0, NotChecked=0, Total=48620 [2023-12-02 20:10:19,043 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 189 mSDsluCounter, 989 mSDsCounter, 0 mSdLazyCounter, 4972 mSolverCounterSat, 249 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 189 SdHoareTripleChecker+Valid, 1004 SdHoareTripleChecker+Invalid, 5221 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 249 IncrementalHoareTripleChecker+Valid, 4972 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.9s IncrementalHoareTripleChecker+Time [2023-12-02 20:10:19,043 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [189 Valid, 1004 Invalid, 5221 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [249 Valid, 4972 Invalid, 0 Unknown, 0 Unchecked, 2.9s Time] [2023-12-02 20:10:19,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2023-12-02 20:10:19,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 168. [2023-12-02 20:10:19,046 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 168 states, 167 states have (on average 1.0119760479041917) internal successors, (169), 167 states have internal predecessors, (169), 0 states have call successors, (0), 0 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 20:10:19,047 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 169 transitions. [2023-12-02 20:10:19,047 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 169 transitions. Word has length 141 [2023-12-02 20:10:19,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:10:19,047 INFO L495 AbstractCegarLoop]: Abstraction has 168 states and 169 transitions. [2023-12-02 20:10:19,047 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 140 states, 140 states have (on average 2.992857142857143) internal successors, (419), 139 states have internal predecessors, (419), 0 states have call successors, (0), 0 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 20:10:19,048 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 169 transitions. [2023-12-02 20:10:19,048 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2023-12-02 20:10:19,048 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:10:19,049 INFO L195 NwaCegarLoop]: trace histogram [28, 27, 27, 27, 27, 27, 1, 1, 1, 1] [2023-12-02 20:10:19,055 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2023-12-02 20:10:19,249 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2023-12-02 20:10:19,249 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-12-02 20:10:19,249 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:10:19,249 INFO L85 PathProgramCache]: Analyzing trace with hash -1777100597, now seen corresponding path program 22 times [2023-12-02 20:10:19,250 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:10:19,250 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [243291805] [2023-12-02 20:10:19,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:10:19,250 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:10:19,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:10:21,485 INFO L134 CoverageAnalysis]: Checked inductivity of 2187 backedges. 54 proven. 2133 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:10:21,485 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:10:21,485 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [243291805] [2023-12-02 20:10:21,485 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [243291805] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 20:10:21,485 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2121252569] [2023-12-02 20:10:21,485 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 20:10:21,486 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:10:21,486 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:10:21,486 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:10:21,487 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2023-12-02 20:10:23,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:10:23,735 INFO L262 TraceCheckSpWp]: Trace formula consists of 954 conjuncts, 116 conjunts are in the unsatisfiable core [2023-12-02 20:10:23,739 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:10:23,968 INFO L134 CoverageAnalysis]: Checked inductivity of 2187 backedges. 54 proven. 2133 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:10:23,968 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:10:27,930 INFO L134 CoverageAnalysis]: Checked inductivity of 2187 backedges. 54 proven. 2133 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:10:27,931 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2121252569] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 20:10:27,931 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1958132106] [2023-12-02 20:10:27,932 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-12-02 20:10:27,932 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 20:10:27,932 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 20:10:27,932 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 20:10:27,932 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 20:10:28,781 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 20:10:30,051 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13728#(or (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (< |ULTIMATE.start_cmemchr_#t~post3#1.offset| 0))' at error location [2023-12-02 20:10:30,051 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 20:10:30,051 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 20:10:30,051 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 58, 58] total 117 [2023-12-02 20:10:30,051 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1276956852] [2023-12-02 20:10:30,051 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 20:10:30,052 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 118 states [2023-12-02 20:10:30,052 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:10:30,053 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 118 interpolants. [2023-12-02 20:10:30,053 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=317, Invalid=15183, Unknown=0, NotChecked=0, Total=15500 [2023-12-02 20:10:30,053 INFO L87 Difference]: Start difference. First operand 168 states and 169 transitions. Second operand has 118 states, 118 states have (on average 2.847457627118644) internal successors, (336), 117 states have internal predecessors, (336), 0 states have call successors, (0), 0 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 20:10:36,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:10:36,360 INFO L93 Difference]: Finished difference Result 280 states and 281 transitions. [2023-12-02 20:10:36,360 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2023-12-02 20:10:36,360 INFO L78 Accepts]: Start accepts. Automaton has has 118 states, 118 states have (on average 2.847457627118644) internal successors, (336), 117 states have internal predecessors, (336), 0 states have call successors, (0), 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 167 [2023-12-02 20:10:36,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:10:36,361 INFO L225 Difference]: With dead ends: 280 [2023-12-02 20:10:36,361 INFO L226 Difference]: Without dead ends: 171 [2023-12-02 20:10:36,363 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 611 GetRequests, 434 SyntacticMatches, 0 SemanticMatches, 177 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3850 ImplicationChecksByTransitivity, 9.7s TimeCoverageRelationStatistics Valid=616, Invalid=31246, Unknown=0, NotChecked=0, Total=31862 [2023-12-02 20:10:36,364 INFO L413 NwaCegarLoop]: 81 mSDtfsCounter, 218 mSDsluCounter, 6358 mSDsCounter, 0 mSdLazyCounter, 6851 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 218 SdHoareTripleChecker+Valid, 6439 SdHoareTripleChecker+Invalid, 6880 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 6851 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.7s IncrementalHoareTripleChecker+Time [2023-12-02 20:10:36,364 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [218 Valid, 6439 Invalid, 6880 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 6851 Invalid, 0 Unknown, 0 Unchecked, 2.7s Time] [2023-12-02 20:10:36,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2023-12-02 20:10:36,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 170. [2023-12-02 20:10:36,368 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 170 states, 169 states have (on average 1.0118343195266273) internal successors, (171), 169 states have internal predecessors, (171), 0 states have call successors, (0), 0 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 20:10:36,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 171 transitions. [2023-12-02 20:10:36,369 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 171 transitions. Word has length 167 [2023-12-02 20:10:36,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:10:36,369 INFO L495 AbstractCegarLoop]: Abstraction has 170 states and 171 transitions. [2023-12-02 20:10:36,369 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 118 states, 118 states have (on average 2.847457627118644) internal successors, (336), 117 states have internal predecessors, (336), 0 states have call successors, (0), 0 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 20:10:36,369 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 171 transitions. [2023-12-02 20:10:36,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2023-12-02 20:10:36,370 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:10:36,370 INFO L195 NwaCegarLoop]: trace histogram [28, 28, 28, 27, 27, 27, 1, 1, 1, 1] [2023-12-02 20:10:36,378 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2023-12-02 20:10:36,571 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2023-12-02 20:10:36,571 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-12-02 20:10:36,571 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:10:36,571 INFO L85 PathProgramCache]: Analyzing trace with hash 1309033053, now seen corresponding path program 23 times [2023-12-02 20:10:36,571 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:10:36,571 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [916508294] [2023-12-02 20:10:36,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:10:36,572 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:10:36,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:10:41,084 INFO L134 CoverageAnalysis]: Checked inductivity of 2242 backedges. 756 proven. 1486 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:10:41,084 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:10:41,084 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [916508294] [2023-12-02 20:10:41,084 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [916508294] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 20:10:41,085 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1541014934] [2023-12-02 20:10:41,085 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 20:10:41,085 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:10:41,085 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:10:41,085 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:10:41,086 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2023-12-02 20:11:09,399 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 28 check-sat command(s) [2023-12-02 20:11:09,399 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 20:11:09,419 INFO L262 TraceCheckSpWp]: Trace formula consists of 954 conjuncts, 310 conjunts are in the unsatisfiable core [2023-12-02 20:11:09,425 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:11:09,433 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 20:11:18,893 INFO L134 CoverageAnalysis]: Checked inductivity of 2242 backedges. 53 proven. 1539 refuted. 0 times theorem prover too weak. 650 trivial. 0 not checked. [2023-12-02 20:11:18,893 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:11:33,743 INFO L134 CoverageAnalysis]: Checked inductivity of 2242 backedges. 79 proven. 1513 refuted. 0 times theorem prover too weak. 650 trivial. 0 not checked. [2023-12-02 20:11:33,743 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1541014934] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 20:11:33,743 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1732327617] [2023-12-02 20:11:33,745 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-12-02 20:11:33,745 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 20:11:33,745 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 20:11:33,745 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 20:11:33,745 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 20:11:34,582 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 20:11:36,801 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15492#(or (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (< |ULTIMATE.start_cmemchr_#t~post3#1.offset| 0))' at error location [2023-12-02 20:11:36,802 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 20:11:36,802 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 20:11:36,802 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 65, 64] total 189 [2023-12-02 20:11:36,802 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1137589138] [2023-12-02 20:11:36,802 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 20:11:36,803 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 191 states [2023-12-02 20:11:36,803 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:11:36,804 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 191 interpolants. [2023-12-02 20:11:36,805 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3369, Invalid=35637, Unknown=0, NotChecked=0, Total=39006 [2023-12-02 20:11:36,805 INFO L87 Difference]: Start difference. First operand 170 states and 171 transitions. Second operand has 191 states, 190 states have (on average 2.1526315789473682) internal successors, (409), 190 states have internal predecessors, (409), 0 states have call successors, (0), 0 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 20:13:21,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:13:21,442 INFO L93 Difference]: Finished difference Result 283 states and 284 transitions. [2023-12-02 20:13:21,442 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 200 states. [2023-12-02 20:13:21,442 INFO L78 Accepts]: Start accepts. Automaton has has 191 states, 190 states have (on average 2.1526315789473682) internal successors, (409), 190 states have internal predecessors, (409), 0 states have call successors, (0), 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 169 [2023-12-02 20:13:21,443 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:13:21,444 INFO L225 Difference]: With dead ends: 283 [2023-12-02 20:13:21,444 INFO L226 Difference]: Without dead ends: 283 [2023-12-02 20:13:21,453 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 763 GetRequests, 369 SyntacticMatches, 0 SemanticMatches, 394 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32190 ImplicationChecksByTransitivity, 121.9s TimeCoverageRelationStatistics Valid=16275, Invalid=140145, Unknown=0, NotChecked=0, Total=156420 [2023-12-02 20:13:21,453 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 1188 mSDsluCounter, 1765 mSDsCounter, 0 mSdLazyCounter, 10614 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1188 SdHoareTripleChecker+Valid, 1791 SdHoareTripleChecker+Invalid, 10650 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 10614 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.6s IncrementalHoareTripleChecker+Time [2023-12-02 20:13:21,453 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1188 Valid, 1791 Invalid, 10650 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 10614 Invalid, 0 Unknown, 0 Unchecked, 7.6s Time] [2023-12-02 20:13:21,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 283 states. [2023-12-02 20:13:21,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 283 to 282. [2023-12-02 20:13:21,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 282 states, 281 states have (on average 1.00711743772242) internal successors, (283), 281 states have internal predecessors, (283), 0 states have call successors, (0), 0 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 20:13:21,460 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 282 states to 282 states and 283 transitions. [2023-12-02 20:13:21,460 INFO L78 Accepts]: Start accepts. Automaton has 282 states and 283 transitions. Word has length 169 [2023-12-02 20:13:21,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:13:21,460 INFO L495 AbstractCegarLoop]: Abstraction has 282 states and 283 transitions. [2023-12-02 20:13:21,461 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 191 states, 190 states have (on average 2.1526315789473682) internal successors, (409), 190 states have internal predecessors, (409), 0 states have call successors, (0), 0 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 20:13:21,461 INFO L276 IsEmpty]: Start isEmpty. Operand 282 states and 283 transitions. [2023-12-02 20:13:21,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 282 [2023-12-02 20:13:21,462 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:13:21,462 INFO L195 NwaCegarLoop]: trace histogram [56, 55, 55, 55, 28, 28, 1, 1, 1, 1] [2023-12-02 20:13:21,472 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2023-12-02 20:13:21,662 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2023-12-02 20:13:21,663 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-12-02 20:13:21,663 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:13:21,663 INFO L85 PathProgramCache]: Analyzing trace with hash -879815579, now seen corresponding path program 24 times [2023-12-02 20:13:21,663 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:13:21,663 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [890670113] [2023-12-02 20:13:21,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:13:21,663 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:13:21,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:13:37,472 INFO L134 CoverageAnalysis]: Checked inductivity of 6834 backedges. 0 proven. 6834 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:13:37,472 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:13:37,473 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [890670113] [2023-12-02 20:13:37,473 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [890670113] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 20:13:37,473 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1354069717] [2023-12-02 20:13:37,473 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 20:13:37,473 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:13:37,473 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:13:37,474 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:13:37,475 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2023-12-02 20:13:56,181 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 20:13:56,181 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 20:13:56,205 INFO L262 TraceCheckSpWp]: Trace formula consists of 1527 conjuncts, 530 conjunts are in the unsatisfiable core [2023-12-02 20:13:56,213 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:13:56,220 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-12-02 20:14:08,538 INFO L134 CoverageAnalysis]: Checked inductivity of 6834 backedges. 218 proven. 6616 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:14:08,538 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:14:27,258 INFO L134 CoverageAnalysis]: Checked inductivity of 6834 backedges. 0 proven. 6834 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:14:27,258 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1354069717] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 20:14:27,258 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2087128704] [2023-12-02 20:14:27,259 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-12-02 20:14:27,259 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 20:14:27,259 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 20:14:27,260 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 20:14:27,260 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 20:14:28,039 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 20:14:31,397 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18408#(and (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) |ULTIMATE.start_cmemchr_#t~post3#1.offset|))' at error location [2023-12-02 20:14:31,398 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 20:14:31,398 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 20:14:31,398 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [90, 88, 89] total 267 [2023-12-02 20:14:31,398 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1636759831] [2023-12-02 20:14:31,398 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 20:14:31,399 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 268 states [2023-12-02 20:14:31,399 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:14:31,402 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 268 interpolants. [2023-12-02 20:14:31,404 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9620, Invalid=66280, Unknown=0, NotChecked=0, Total=75900 [2023-12-02 20:14:31,404 INFO L87 Difference]: Start difference. First operand 282 states and 283 transitions. Second operand has 268 states, 268 states have (on average 3.1455223880597014) internal successors, (843), 267 states have internal predecessors, (843), 0 states have call successors, (0), 0 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 20:17:13,367 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:17:13,367 INFO L93 Difference]: Finished difference Result 683 states and 712 transitions. [2023-12-02 20:17:13,368 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 235 states. [2023-12-02 20:17:13,368 INFO L78 Accepts]: Start accepts. Automaton has has 268 states, 268 states have (on average 3.1455223880597014) internal successors, (843), 267 states have internal predecessors, (843), 0 states have call successors, (0), 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 281 [2023-12-02 20:17:13,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:17:13,370 INFO L225 Difference]: With dead ends: 683 [2023-12-02 20:17:13,370 INFO L226 Difference]: Without dead ends: 568 [2023-12-02 20:17:13,381 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1159 GetRequests, 657 SyntacticMatches, 0 SemanticMatches, 502 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 63787 ImplicationChecksByTransitivity, 186.2s TimeCoverageRelationStatistics Valid=32474, Invalid=221038, Unknown=0, NotChecked=0, Total=253512 [2023-12-02 20:17:13,382 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 7456 mSDsluCounter, 4302 mSDsCounter, 0 mSdLazyCounter, 19166 mSolverCounterSat, 936 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7456 SdHoareTripleChecker+Valid, 4330 SdHoareTripleChecker+Invalid, 20102 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 936 IncrementalHoareTripleChecker+Valid, 19166 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 11.5s IncrementalHoareTripleChecker+Time [2023-12-02 20:17:13,382 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7456 Valid, 4330 Invalid, 20102 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [936 Valid, 19166 Invalid, 0 Unknown, 0 Unchecked, 11.5s Time] [2023-12-02 20:17:13,382 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 568 states. [2023-12-02 20:17:13,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 568 to 345. [2023-12-02 20:17:13,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 345 states, 344 states have (on average 1.0872093023255813) internal successors, (374), 344 states have internal predecessors, (374), 0 states have call successors, (0), 0 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 20:17:13,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 345 states to 345 states and 374 transitions. [2023-12-02 20:17:13,388 INFO L78 Accepts]: Start accepts. Automaton has 345 states and 374 transitions. Word has length 281 [2023-12-02 20:17:13,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:17:13,388 INFO L495 AbstractCegarLoop]: Abstraction has 345 states and 374 transitions. [2023-12-02 20:17:13,388 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 268 states, 268 states have (on average 3.1455223880597014) internal successors, (843), 267 states have internal predecessors, (843), 0 states have call successors, (0), 0 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 20:17:13,389 INFO L276 IsEmpty]: Start isEmpty. Operand 345 states and 374 transitions. [2023-12-02 20:17:13,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 288 [2023-12-02 20:17:13,390 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:17:13,390 INFO L195 NwaCegarLoop]: trace histogram [57, 56, 56, 56, 29, 29, 1, 1, 1, 1] [2023-12-02 20:17:13,402 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Ended with exit code 0 [2023-12-02 20:17:13,590 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:17:13,590 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-12-02 20:17:13,591 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:17:13,591 INFO L85 PathProgramCache]: Analyzing trace with hash 2005113317, now seen corresponding path program 25 times [2023-12-02 20:17:13,591 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:17:13,591 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1933706828] [2023-12-02 20:17:13,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:17:13,591 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:17:13,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:17:30,057 INFO L134 CoverageAnalysis]: Checked inductivity of 7113 backedges. 0 proven. 7113 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:17:30,058 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:17:30,058 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1933706828] [2023-12-02 20:17:30,058 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1933706828] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 20:17:30,058 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1700681664] [2023-12-02 20:17:30,058 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 20:17:30,058 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:17:30,058 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:17:30,059 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:17:30,060 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2023-12-02 20:17:30,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:17:30,826 INFO L262 TraceCheckSpWp]: Trace formula consists of 1560 conjuncts, 533 conjunts are in the unsatisfiable core [2023-12-02 20:17:30,833 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:17:30,838 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-12-02 20:17:39,948 INFO L134 CoverageAnalysis]: Checked inductivity of 7113 backedges. 3186 proven. 2523 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2023-12-02 20:17:39,948 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:17:57,673 INFO L134 CoverageAnalysis]: Checked inductivity of 7113 backedges. 0 proven. 7113 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:17:57,673 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1700681664] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 20:17:57,673 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2051338265] [2023-12-02 20:17:57,675 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-12-02 20:17:57,675 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 20:17:57,675 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 20:17:57,675 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 20:17:57,675 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 20:17:58,503 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 20:18:01,016 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '21866#(or (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (< |ULTIMATE.start_cmemchr_#t~post3#1.offset| 0))' at error location [2023-12-02 20:18:01,016 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 20:18:01,017 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 20:18:01,017 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [92, 65, 92] total 249 [2023-12-02 20:18:01,017 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1992133240] [2023-12-02 20:18:01,017 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 20:18:01,018 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 250 states [2023-12-02 20:18:01,018 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:18:01,021 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 250 interpolants. [2023-12-02 20:18:01,023 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4381, Invalid=61411, Unknown=0, NotChecked=0, Total=65792 [2023-12-02 20:18:01,024 INFO L87 Difference]: Start difference. First operand 345 states and 374 transitions. Second operand has 250 states, 250 states have (on average 3.032) internal successors, (758), 249 states have internal predecessors, (758), 0 states have call successors, (0), 0 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 20:20:57,610 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:20:57,610 INFO L93 Difference]: Finished difference Result 701 states and 731 transitions. [2023-12-02 20:20:57,611 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 268 states. [2023-12-02 20:20:57,611 INFO L78 Accepts]: Start accepts. Automaton has has 250 states, 250 states have (on average 3.032) internal successors, (758), 249 states have internal predecessors, (758), 0 states have call successors, (0), 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 287 [2023-12-02 20:20:57,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:20:57,614 INFO L225 Difference]: With dead ends: 701 [2023-12-02 20:20:57,614 INFO L226 Difference]: Without dead ends: 582 [2023-12-02 20:20:57,626 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1213 GetRequests, 696 SyntacticMatches, 0 SemanticMatches, 517 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58197 ImplicationChecksByTransitivity, 196.4s TimeCoverageRelationStatistics Valid=29291, Invalid=239551, Unknown=0, NotChecked=0, Total=268842 [2023-12-02 20:20:57,626 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 9175 mSDsluCounter, 3904 mSDsCounter, 0 mSdLazyCounter, 22494 mSolverCounterSat, 238 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9175 SdHoareTripleChecker+Valid, 3934 SdHoareTripleChecker+Invalid, 22732 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 238 IncrementalHoareTripleChecker+Valid, 22494 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 12.0s IncrementalHoareTripleChecker+Time [2023-12-02 20:20:57,626 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9175 Valid, 3934 Invalid, 22732 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [238 Valid, 22494 Invalid, 0 Unknown, 0 Unchecked, 12.0s Time] [2023-12-02 20:20:57,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 582 states. [2023-12-02 20:20:57,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 582 to 572. [2023-12-02 20:20:57,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 572 states, 571 states have (on average 1.0560420315236427) internal successors, (603), 571 states have internal predecessors, (603), 0 states have call successors, (0), 0 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 20:20:57,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 572 states to 572 states and 603 transitions. [2023-12-02 20:20:57,637 INFO L78 Accepts]: Start accepts. Automaton has 572 states and 603 transitions. Word has length 287 [2023-12-02 20:20:57,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:20:57,637 INFO L495 AbstractCegarLoop]: Abstraction has 572 states and 603 transitions. [2023-12-02 20:20:57,638 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 250 states, 250 states have (on average 3.032) internal successors, (758), 249 states have internal predecessors, (758), 0 states have call successors, (0), 0 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 20:20:57,638 INFO L276 IsEmpty]: Start isEmpty. Operand 572 states and 603 transitions. [2023-12-02 20:20:57,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 290 [2023-12-02 20:20:57,640 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:20:57,640 INFO L195 NwaCegarLoop]: trace histogram [57, 56, 56, 56, 30, 30, 1, 1, 1, 1] [2023-12-02 20:20:57,649 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2023-12-02 20:20:57,840 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:20:57,840 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-12-02 20:20:57,841 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:20:57,841 INFO L85 PathProgramCache]: Analyzing trace with hash -2060528265, now seen corresponding path program 26 times [2023-12-02 20:20:57,841 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:20:57,841 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1007400603] [2023-12-02 20:20:57,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:20:57,841 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:20:58,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:21:14,009 INFO L134 CoverageAnalysis]: Checked inductivity of 7172 backedges. 0 proven. 7172 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:21:14,009 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:21:14,010 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1007400603] [2023-12-02 20:21:14,010 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1007400603] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 20:21:14,010 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [850387778] [2023-12-02 20:21:14,010 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 20:21:14,010 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:21:14,010 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:21:14,011 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:21:14,012 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a4bdff3-c5a4-4490-a6a8-4045bf87d002/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process