./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-memsafety/openbsd_cstrstr-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-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cef2e947-cab8-4d9a-8154-39d4ac9ba1aa/bin/utaipan-verify-SwPr7d2a91/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cef2e947-cab8-4d9a-8154-39d4ac9ba1aa/bin/utaipan-verify-SwPr7d2a91/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cef2e947-cab8-4d9a-8154-39d4ac9ba1aa/bin/utaipan-verify-SwPr7d2a91/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cef2e947-cab8-4d9a-8154-39d4ac9ba1aa/bin/utaipan-verify-SwPr7d2a91/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/openbsd_cstrstr-alloca-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cef2e947-cab8-4d9a-8154-39d4ac9ba1aa/bin/utaipan-verify-SwPr7d2a91/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cef2e947-cab8-4d9a-8154-39d4ac9ba1aa/bin/utaipan-verify-SwPr7d2a91 --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 991fb09b573d5827d0db553f1ea89a581f5a664ba8b68d6f14a043df738f2f6d --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-11-24 23:16:05,265 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-24 23:16:05,390 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cef2e947-cab8-4d9a-8154-39d4ac9ba1aa/bin/utaipan-verify-SwPr7d2a91/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2023-11-24 23:16:05,394 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-24 23:16:05,395 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-24 23:16:05,445 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-24 23:16:05,446 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-24 23:16:05,447 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-24 23:16:05,448 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-24 23:16:05,453 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-24 23:16:05,453 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-24 23:16:05,455 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-24 23:16:05,455 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-24 23:16:05,457 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-24 23:16:05,458 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-24 23:16:05,458 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-24 23:16:05,459 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-24 23:16:05,459 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-24 23:16:05,460 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-24 23:16:05,460 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-24 23:16:05,461 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-24 23:16:05,462 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-24 23:16:05,462 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-24 23:16:05,463 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-24 23:16:05,464 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-24 23:16:05,484 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-24 23:16:05,484 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-24 23:16:05,485 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-24 23:16:05,485 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-24 23:16:05,486 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-11-24 23:16:05,487 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2023-11-24 23:16:05,487 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-11-24 23:16:05,488 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-24 23:16:05,488 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-11-24 23:16:05,488 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-11-24 23:16:05,488 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-24 23:16:05,489 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-24 23:16:05,489 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-24 23:16:05,489 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-24 23:16:05,490 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-24 23:16:05,491 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-24 23:16:05,491 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-24 23:16:05,492 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-24 23:16:05,492 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-24 23:16:05,493 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-24 23:16:05,493 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-24 23:16:05,493 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-24 23:16:05,493 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-24 23:16:05,494 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_cef2e947-cab8-4d9a-8154-39d4ac9ba1aa/bin/utaipan-verify-SwPr7d2a91/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cef2e947-cab8-4d9a-8154-39d4ac9ba1aa/bin/utaipan-verify-SwPr7d2a91 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 991fb09b573d5827d0db553f1ea89a581f5a664ba8b68d6f14a043df738f2f6d [2023-11-24 23:16:05,824 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-24 23:16:05,857 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-24 23:16:05,861 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-24 23:16:05,862 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-24 23:16:05,863 INFO L274 PluginConnector]: CDTParser initialized [2023-11-24 23:16:05,864 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cef2e947-cab8-4d9a-8154-39d4ac9ba1aa/bin/utaipan-verify-SwPr7d2a91/../../sv-benchmarks/c/array-memsafety/openbsd_cstrstr-alloca-2.i [2023-11-24 23:16:08,934 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-24 23:16:09,264 INFO L384 CDTParser]: Found 1 translation units. [2023-11-24 23:16:09,266 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cef2e947-cab8-4d9a-8154-39d4ac9ba1aa/sv-benchmarks/c/array-memsafety/openbsd_cstrstr-alloca-2.i [2023-11-24 23:16:09,288 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cef2e947-cab8-4d9a-8154-39d4ac9ba1aa/bin/utaipan-verify-SwPr7d2a91/data/86eb27d7c/debbf65e7ed54e65ad19968c26d96790/FLAGd1203d602 [2023-11-24 23:16:09,303 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cef2e947-cab8-4d9a-8154-39d4ac9ba1aa/bin/utaipan-verify-SwPr7d2a91/data/86eb27d7c/debbf65e7ed54e65ad19968c26d96790 [2023-11-24 23:16:09,308 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-24 23:16:09,310 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-24 23:16:09,313 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-24 23:16:09,313 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-24 23:16:09,318 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-24 23:16:09,319 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 11:16:09" (1/1) ... [2023-11-24 23:16:09,320 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5588698d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:16:09, skipping insertion in model container [2023-11-24 23:16:09,320 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 11:16:09" (1/1) ... [2023-11-24 23:16:09,372 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-24 23:16:09,787 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-24 23:16:09,800 INFO L202 MainTranslator]: Completed pre-run [2023-11-24 23:16:09,847 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-24 23:16:09,880 INFO L206 MainTranslator]: Completed translation [2023-11-24 23:16:09,881 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:16:09 WrapperNode [2023-11-24 23:16:09,881 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-24 23:16:09,883 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-24 23:16:09,883 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-24 23:16:09,884 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-24 23:16:09,891 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:16:09" (1/1) ... [2023-11-24 23:16:09,911 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:16:09" (1/1) ... [2023-11-24 23:16:09,939 INFO L138 Inliner]: procedures = 119, calls = 23, calls flagged for inlining = 5, calls inlined = 5, statements flattened = 165 [2023-11-24 23:16:09,939 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-24 23:16:09,940 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-24 23:16:09,940 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-24 23:16:09,941 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-24 23:16:09,949 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:16:09" (1/1) ... [2023-11-24 23:16:09,949 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:16:09" (1/1) ... [2023-11-24 23:16:09,954 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:16:09" (1/1) ... [2023-11-24 23:16:09,954 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:16:09" (1/1) ... [2023-11-24 23:16:09,963 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:16:09" (1/1) ... [2023-11-24 23:16:09,967 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:16:09" (1/1) ... [2023-11-24 23:16:09,969 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:16:09" (1/1) ... [2023-11-24 23:16:09,971 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:16:09" (1/1) ... [2023-11-24 23:16:09,975 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-24 23:16:09,976 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-24 23:16:09,976 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-24 23:16:09,976 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-24 23:16:09,977 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:16:09" (1/1) ... [2023-11-24 23:16:09,987 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-24 23:16:10,013 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cef2e947-cab8-4d9a-8154-39d4ac9ba1aa/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:16:10,041 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cef2e947-cab8-4d9a-8154-39d4ac9ba1aa/bin/utaipan-verify-SwPr7d2a91/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-24 23:16:10,059 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cef2e947-cab8-4d9a-8154-39d4ac9ba1aa/bin/utaipan-verify-SwPr7d2a91/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-24 23:16:10,087 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-24 23:16:10,088 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-24 23:16:10,088 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-24 23:16:10,089 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-24 23:16:10,089 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-24 23:16:10,089 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-24 23:16:10,217 INFO L241 CfgBuilder]: Building ICFG [2023-11-24 23:16:10,219 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-24 23:16:10,568 INFO L282 CfgBuilder]: Performing block encoding [2023-11-24 23:16:10,687 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-24 23:16:10,687 INFO L309 CfgBuilder]: Removed 6 assume(true) statements. [2023-11-24 23:16:10,689 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 11:16:10 BoogieIcfgContainer [2023-11-24 23:16:10,689 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-24 23:16:10,692 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-24 23:16:10,712 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-24 23:16:10,718 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-24 23:16:10,719 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.11 11:16:09" (1/3) ... [2023-11-24 23:16:10,719 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@cbdcca9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.11 11:16:10, skipping insertion in model container [2023-11-24 23:16:10,719 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:16:09" (2/3) ... [2023-11-24 23:16:10,720 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@cbdcca9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.11 11:16:10, skipping insertion in model container [2023-11-24 23:16:10,720 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 11:16:10" (3/3) ... [2023-11-24 23:16:10,722 INFO L112 eAbstractionObserver]: Analyzing ICFG openbsd_cstrstr-alloca-2.i [2023-11-24 23:16:10,743 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-24 23:16:10,743 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 25 error locations. [2023-11-24 23:16:10,812 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-24 23:16:10,820 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;@1a4327de, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-24 23:16:10,821 INFO L358 AbstractCegarLoop]: Starting to check reachability of 25 error locations. [2023-11-24 23:16:10,826 INFO L276 IsEmpty]: Start isEmpty. Operand has 60 states, 34 states have (on average 2.176470588235294) internal successors, (74), 59 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) [2023-11-24 23:16:10,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2023-11-24 23:16:10,833 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:16:10,835 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2023-11-24 23:16:10,835 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2023-11-24 23:16:10,843 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:16:10,843 INFO L85 PathProgramCache]: Analyzing trace with hash 222729, now seen corresponding path program 1 times [2023-11-24 23:16:10,864 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:16:10,865 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2017054654] [2023-11-24 23:16:10,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:16:10,867 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:16:10,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:16:11,316 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:16:11,317 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:16:11,317 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2017054654] [2023-11-24 23:16:11,318 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2017054654] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:16:11,318 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 23:16:11,319 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-11-24 23:16:11,321 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1384916505] [2023-11-24 23:16:11,322 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:16:11,326 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-24 23:16:11,327 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:16:11,373 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-24 23:16:11,373 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-24 23:16:11,376 INFO L87 Difference]: Start difference. First operand has 60 states, 34 states have (on average 2.176470588235294) internal successors, (74), 59 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) Second operand has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:16:11,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:16:11,505 INFO L93 Difference]: Finished difference Result 58 states and 68 transitions. [2023-11-24 23:16:11,507 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-24 23:16:11,508 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2023-11-24 23:16:11,509 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:16:11,517 INFO L225 Difference]: With dead ends: 58 [2023-11-24 23:16:11,518 INFO L226 Difference]: Without dead ends: 57 [2023-11-24 23:16:11,520 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-24 23:16:11,524 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 63 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-24 23:16:11,525 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [63 Valid, 36 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-24 23:16:11,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2023-11-24 23:16:11,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2023-11-24 23:16:11,575 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 34 states have (on average 1.9705882352941178) internal successors, (67), 56 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:16:11,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 67 transitions. [2023-11-24 23:16:11,580 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 67 transitions. Word has length 3 [2023-11-24 23:16:11,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:16:11,581 INFO L495 AbstractCegarLoop]: Abstraction has 57 states and 67 transitions. [2023-11-24 23:16:11,581 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:16:11,583 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 67 transitions. [2023-11-24 23:16:11,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2023-11-24 23:16:11,586 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:16:11,586 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2023-11-24 23:16:11,586 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-24 23:16:11,587 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2023-11-24 23:16:11,588 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:16:11,589 INFO L85 PathProgramCache]: Analyzing trace with hash 222730, now seen corresponding path program 1 times [2023-11-24 23:16:11,589 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:16:11,589 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [773766078] [2023-11-24 23:16:11,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:16:11,591 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:16:11,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:16:12,076 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:16:12,077 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:16:12,078 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [773766078] [2023-11-24 23:16:12,078 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [773766078] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:16:12,078 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 23:16:12,079 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-24 23:16:12,079 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2146816462] [2023-11-24 23:16:12,079 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:16:12,081 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-24 23:16:12,081 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:16:12,082 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-24 23:16:12,083 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-24 23:16:12,083 INFO L87 Difference]: Start difference. First operand 57 states and 67 transitions. Second operand has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:16:12,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:16:12,268 INFO L93 Difference]: Finished difference Result 57 states and 68 transitions. [2023-11-24 23:16:12,269 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-24 23:16:12,269 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2023-11-24 23:16:12,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:16:12,270 INFO L225 Difference]: With dead ends: 57 [2023-11-24 23:16:12,270 INFO L226 Difference]: Without dead ends: 57 [2023-11-24 23:16:12,271 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-11-24 23:16:12,273 INFO L413 NwaCegarLoop]: 51 mSDtfsCounter, 2 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 70 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 123 SdHoareTripleChecker+Invalid, 72 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 70 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-24 23:16:12,273 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 123 Invalid, 72 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 70 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-24 23:16:12,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2023-11-24 23:16:12,284 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 56. [2023-11-24 23:16:12,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 34 states have (on average 1.9411764705882353) internal successors, (66), 55 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:16:12,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 66 transitions. [2023-11-24 23:16:12,290 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 66 transitions. Word has length 3 [2023-11-24 23:16:12,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:16:12,291 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 66 transitions. [2023-11-24 23:16:12,291 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:16:12,291 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 66 transitions. [2023-11-24 23:16:12,292 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2023-11-24 23:16:12,292 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:16:12,292 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2023-11-24 23:16:12,292 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-24 23:16:12,293 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2023-11-24 23:16:12,294 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:16:12,294 INFO L85 PathProgramCache]: Analyzing trace with hash 7082004, now seen corresponding path program 1 times [2023-11-24 23:16:12,295 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:16:12,295 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1227639342] [2023-11-24 23:16:12,295 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:16:12,297 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:16:12,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:16:12,367 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:16:12,368 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:16:12,368 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1227639342] [2023-11-24 23:16:12,369 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1227639342] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:16:12,369 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 23:16:12,369 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-24 23:16:12,370 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [21715745] [2023-11-24 23:16:12,371 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:16:12,372 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-24 23:16:12,372 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:16:12,374 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-24 23:16:12,374 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-24 23:16:12,374 INFO L87 Difference]: Start difference. First operand 56 states and 66 transitions. Second operand has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:16:12,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:16:12,446 INFO L93 Difference]: Finished difference Result 57 states and 67 transitions. [2023-11-24 23:16:12,447 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-24 23:16:12,447 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2023-11-24 23:16:12,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:16:12,452 INFO L225 Difference]: With dead ends: 57 [2023-11-24 23:16:12,455 INFO L226 Difference]: Without dead ends: 57 [2023-11-24 23:16:12,457 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-24 23:16:12,464 INFO L413 NwaCegarLoop]: 51 mSDtfsCounter, 1 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 100 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-24 23:16:12,465 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 100 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-24 23:16:12,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2023-11-24 23:16:12,470 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2023-11-24 23:16:12,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 35 states have (on average 1.9142857142857144) internal successors, (67), 56 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:16:12,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 67 transitions. [2023-11-24 23:16:12,472 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 67 transitions. Word has length 4 [2023-11-24 23:16:12,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:16:12,472 INFO L495 AbstractCegarLoop]: Abstraction has 57 states and 67 transitions. [2023-11-24 23:16:12,473 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:16:12,473 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 67 transitions. [2023-11-24 23:16:12,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-24 23:16:12,473 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:16:12,473 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-24 23:16:12,474 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-24 23:16:12,474 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2023-11-24 23:16:12,475 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:16:12,475 INFO L85 PathProgramCache]: Analyzing trace with hash -1949707692, now seen corresponding path program 1 times [2023-11-24 23:16:12,478 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:16:12,478 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1730809136] [2023-11-24 23:16:12,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:16:12,478 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:16:12,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:16:12,595 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-24 23:16:12,595 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:16:12,596 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1730809136] [2023-11-24 23:16:12,596 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1730809136] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:16:12,596 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 23:16:12,596 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-24 23:16:12,596 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1713540760] [2023-11-24 23:16:12,597 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:16:12,597 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-24 23:16:12,597 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:16:12,598 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-24 23:16:12,599 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-24 23:16:12,599 INFO L87 Difference]: Start difference. First operand 57 states and 67 transitions. Second operand has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:16:12,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:16:12,709 INFO L93 Difference]: Finished difference Result 61 states and 71 transitions. [2023-11-24 23:16:12,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-24 23:16:12,710 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2023-11-24 23:16:12,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:16:12,711 INFO L225 Difference]: With dead ends: 61 [2023-11-24 23:16:12,711 INFO L226 Difference]: Without dead ends: 61 [2023-11-24 23:16:12,711 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-24 23:16:12,713 INFO L413 NwaCegarLoop]: 49 mSDtfsCounter, 66 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-24 23:16:12,713 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [66 Valid, 98 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-24 23:16:12,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2023-11-24 23:16:12,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 58. [2023-11-24 23:16:12,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 36 states have (on average 1.8888888888888888) internal successors, (68), 57 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:16:12,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 68 transitions. [2023-11-24 23:16:12,750 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 68 transitions. Word has length 6 [2023-11-24 23:16:12,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:16:12,751 INFO L495 AbstractCegarLoop]: Abstraction has 58 states and 68 transitions. [2023-11-24 23:16:12,751 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:16:12,751 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 68 transitions. [2023-11-24 23:16:12,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-24 23:16:12,752 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:16:12,752 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-24 23:16:12,753 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-24 23:16:12,753 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2023-11-24 23:16:12,754 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:16:12,754 INFO L85 PathProgramCache]: Analyzing trace with hash -1949712539, now seen corresponding path program 1 times [2023-11-24 23:16:12,754 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:16:12,754 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1789137232] [2023-11-24 23:16:12,755 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:16:12,755 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:16:12,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:16:12,861 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-24 23:16:12,861 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:16:12,861 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1789137232] [2023-11-24 23:16:12,862 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1789137232] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:16:12,862 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 23:16:12,862 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-11-24 23:16:12,862 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1629314908] [2023-11-24 23:16:12,862 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:16:12,864 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-24 23:16:12,864 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:16:12,865 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-24 23:16:12,866 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-24 23:16:12,866 INFO L87 Difference]: Start difference. First operand 58 states and 68 transitions. Second operand has 3 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:16:12,925 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:16:12,925 INFO L93 Difference]: Finished difference Result 56 states and 66 transitions. [2023-11-24 23:16:12,926 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-24 23:16:12,926 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2023-11-24 23:16:12,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:16:12,929 INFO L225 Difference]: With dead ends: 56 [2023-11-24 23:16:12,929 INFO L226 Difference]: Without dead ends: 56 [2023-11-24 23:16:12,929 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-24 23:16:12,931 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 57 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-24 23:16:12,932 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [57 Valid, 35 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-24 23:16:12,934 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2023-11-24 23:16:12,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2023-11-24 23:16:12,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 36 states have (on average 1.8333333333333333) internal successors, (66), 55 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:16:12,953 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 66 transitions. [2023-11-24 23:16:12,955 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 66 transitions. Word has length 6 [2023-11-24 23:16:12,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:16:12,955 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 66 transitions. [2023-11-24 23:16:12,956 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:16:12,956 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 66 transitions. [2023-11-24 23:16:12,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-24 23:16:12,957 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:16:12,957 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-24 23:16:12,957 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-11-24 23:16:12,957 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2023-11-24 23:16:12,958 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:16:12,958 INFO L85 PathProgramCache]: Analyzing trace with hash -1949712538, now seen corresponding path program 1 times [2023-11-24 23:16:12,958 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:16:12,959 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1877438236] [2023-11-24 23:16:12,959 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:16:12,959 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:16:12,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:16:13,217 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-24 23:16:13,217 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:16:13,217 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1877438236] [2023-11-24 23:16:13,218 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1877438236] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:16:13,218 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 23:16:13,218 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-24 23:16:13,218 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [561380890] [2023-11-24 23:16:13,219 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:16:13,220 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-24 23:16:13,221 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:16:13,222 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-24 23:16:13,222 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-24 23:16:13,223 INFO L87 Difference]: Start difference. First operand 56 states and 66 transitions. Second operand has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:16:13,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:16:13,421 INFO L93 Difference]: Finished difference Result 57 states and 67 transitions. [2023-11-24 23:16:13,422 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-24 23:16:13,423 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2023-11-24 23:16:13,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:16:13,423 INFO L225 Difference]: With dead ends: 57 [2023-11-24 23:16:13,424 INFO L226 Difference]: Without dead ends: 57 [2023-11-24 23:16:13,425 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2023-11-24 23:16:13,429 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 63 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 89 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 102 SdHoareTripleChecker+Invalid, 89 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 89 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-24 23:16:13,432 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [63 Valid, 102 Invalid, 89 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 89 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-24 23:16:13,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2023-11-24 23:16:13,442 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2023-11-24 23:16:13,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 37 states have (on average 1.8108108108108107) internal successors, (67), 56 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:16:13,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 67 transitions. [2023-11-24 23:16:13,450 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 67 transitions. Word has length 6 [2023-11-24 23:16:13,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:16:13,450 INFO L495 AbstractCegarLoop]: Abstraction has 57 states and 67 transitions. [2023-11-24 23:16:13,451 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:16:13,451 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 67 transitions. [2023-11-24 23:16:13,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-24 23:16:13,451 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:16:13,452 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:16:13,452 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-11-24 23:16:13,452 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2023-11-24 23:16:13,453 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:16:13,453 INFO L85 PathProgramCache]: Analyzing trace with hash -1067860534, now seen corresponding path program 1 times [2023-11-24 23:16:13,454 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:16:13,454 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [101249535] [2023-11-24 23:16:13,454 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:16:13,454 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:16:13,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:16:13,614 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-24 23:16:13,614 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:16:13,614 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [101249535] [2023-11-24 23:16:13,614 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [101249535] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:16:13,615 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [567831840] [2023-11-24 23:16:13,615 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:16:13,615 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:16:13,615 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cef2e947-cab8-4d9a-8154-39d4ac9ba1aa/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:16:13,619 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cef2e947-cab8-4d9a-8154-39d4ac9ba1aa/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:16:13,635 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cef2e947-cab8-4d9a-8154-39d4ac9ba1aa/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-24 23:16:13,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:16:13,717 INFO L262 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-24 23:16:13,722 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:16:13,959 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-24 23:16:13,959 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:16:14,073 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 18 [2023-11-24 23:16:14,113 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-24 23:16:14,114 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [567831840] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 23:16:14,116 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [332831883] [2023-11-24 23:16:14,138 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-24 23:16:14,138 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:16:14,144 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-24 23:16:14,150 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-24 23:16:14,151 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-24 23:16:15,716 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-24 23:16:16,165 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '830#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 1 |#StackHeapBarrier|) (or (< |ULTIMATE.start_main_~length1~0#1| 1) (< (select |#length| |ULTIMATE.start_main_~nondetString1~0#1.base|) |ULTIMATE.start_main_~length1~0#1|)) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= 2 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc23#1.base|))' at error location [2023-11-24 23:16:16,165 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-24 23:16:16,166 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-24 23:16:16,166 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 10 [2023-11-24 23:16:16,166 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1960532153] [2023-11-24 23:16:16,166 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-24 23:16:16,167 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-11-24 23:16:16,167 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:16:16,168 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-11-24 23:16:16,169 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=239, Unknown=0, NotChecked=0, Total=306 [2023-11-24 23:16:16,170 INFO L87 Difference]: Start difference. First operand 57 states and 67 transitions. Second operand has 12 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 11 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:16:16,345 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:16:16,345 INFO L93 Difference]: Finished difference Result 56 states and 66 transitions. [2023-11-24 23:16:16,346 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-24 23:16:16,347 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 11 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) Word has length 8 [2023-11-24 23:16:16,347 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:16:16,348 INFO L225 Difference]: With dead ends: 56 [2023-11-24 23:16:16,349 INFO L226 Difference]: Without dead ends: 56 [2023-11-24 23:16:16,349 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 9 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=91, Invalid=289, Unknown=0, NotChecked=0, Total=380 [2023-11-24 23:16:16,350 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 122 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 82 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 122 SdHoareTripleChecker+Valid, 102 SdHoareTripleChecker+Invalid, 89 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 82 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-24 23:16:16,351 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [122 Valid, 102 Invalid, 89 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 82 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-24 23:16:16,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2023-11-24 23:16:16,362 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2023-11-24 23:16:16,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 37 states have (on average 1.7837837837837838) internal successors, (66), 55 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:16:16,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 66 transitions. [2023-11-24 23:16:16,365 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 66 transitions. Word has length 8 [2023-11-24 23:16:16,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:16:16,366 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 66 transitions. [2023-11-24 23:16:16,366 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 11 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:16:16,366 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 66 transitions. [2023-11-24 23:16:16,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-24 23:16:16,367 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:16:16,367 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1] [2023-11-24 23:16:16,379 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cef2e947-cab8-4d9a-8154-39d4ac9ba1aa/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-24 23:16:16,573 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cef2e947-cab8-4d9a-8154-39d4ac9ba1aa/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-11-24 23:16:16,574 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2023-11-24 23:16:16,574 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:16:16,574 INFO L85 PathProgramCache]: Analyzing trace with hash -1067865380, now seen corresponding path program 1 times [2023-11-24 23:16:16,574 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:16:16,575 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1499472835] [2023-11-24 23:16:16,575 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:16:16,575 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:16:16,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:16:16,887 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-24 23:16:16,887 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:16:16,888 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1499472835] [2023-11-24 23:16:16,888 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1499472835] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:16:16,888 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1368713377] [2023-11-24 23:16:16,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:16:16,888 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:16:16,889 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cef2e947-cab8-4d9a-8154-39d4ac9ba1aa/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:16:16,890 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cef2e947-cab8-4d9a-8154-39d4ac9ba1aa/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:16:16,907 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cef2e947-cab8-4d9a-8154-39d4ac9ba1aa/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-24 23:16:16,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:16:16,970 INFO L262 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 18 conjunts are in the unsatisfiable core [2023-11-24 23:16:16,973 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:16:17,005 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 7 [2023-11-24 23:16:17,014 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-11-24 23:16:17,268 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-24 23:16:17,269 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:16:17,461 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-24 23:16:17,462 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1368713377] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 23:16:17,462 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [636182368] [2023-11-24 23:16:17,464 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2023-11-24 23:16:17,465 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:16:17,465 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-24 23:16:17,465 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-24 23:16:17,465 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-24 23:16:18,462 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-24 23:16:18,901 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1008#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_#t~nondet27#1| 127) (<= 0 (+ 128 |ULTIMATE.start_main_#t~nondet27#1|)) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= 2 |ULTIMATE.start_main_#t~malloc22#1.base|) (<= (select |#length| |ULTIMATE.start_main_~nondetString2~0#1.base|) |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc23#1.base|))' at error location [2023-11-24 23:16:18,902 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-24 23:16:18,902 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-24 23:16:18,902 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 12 [2023-11-24 23:16:18,902 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [928207801] [2023-11-24 23:16:18,902 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-24 23:16:18,904 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-11-24 23:16:18,904 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:16:18,904 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-11-24 23:16:18,905 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=272, Unknown=0, NotChecked=0, Total=342 [2023-11-24 23:16:18,905 INFO L87 Difference]: Start difference. First operand 56 states and 66 transitions. Second operand has 14 states, 13 states have (on average 1.8461538461538463) 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) [2023-11-24 23:16:19,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:16:19,304 INFO L93 Difference]: Finished difference Result 56 states and 67 transitions. [2023-11-24 23:16:19,305 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-24 23:16:19,305 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 1.8461538461538463) 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 8 [2023-11-24 23:16:19,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:16:19,305 INFO L225 Difference]: With dead ends: 56 [2023-11-24 23:16:19,306 INFO L226 Difference]: Without dead ends: 56 [2023-11-24 23:16:19,306 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 106 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=104, Invalid=358, Unknown=0, NotChecked=0, Total=462 [2023-11-24 23:16:19,307 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 121 mSDsluCounter, 238 mSDsCounter, 0 mSdLazyCounter, 217 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 121 SdHoareTripleChecker+Valid, 272 SdHoareTripleChecker+Invalid, 222 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 217 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-24 23:16:19,310 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [121 Valid, 272 Invalid, 222 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 217 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-24 23:16:19,310 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2023-11-24 23:16:19,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 53. [2023-11-24 23:16:19,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 36 states have (on average 1.75) internal successors, (63), 52 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) [2023-11-24 23:16:19,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 63 transitions. [2023-11-24 23:16:19,316 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 63 transitions. Word has length 8 [2023-11-24 23:16:19,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:16:19,316 INFO L495 AbstractCegarLoop]: Abstraction has 53 states and 63 transitions. [2023-11-24 23:16:19,317 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 1.8461538461538463) 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) [2023-11-24 23:16:19,317 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 63 transitions. [2023-11-24 23:16:19,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-11-24 23:16:19,317 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:16:19,317 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:16:19,328 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cef2e947-cab8-4d9a-8154-39d4ac9ba1aa/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-24 23:16:19,523 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cef2e947-cab8-4d9a-8154-39d4ac9ba1aa/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:16:19,524 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2023-11-24 23:16:19,524 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:16:19,524 INFO L85 PathProgramCache]: Analyzing trace with hash 283214350, now seen corresponding path program 1 times [2023-11-24 23:16:19,524 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:16:19,524 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1310117572] [2023-11-24 23:16:19,525 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:16:19,525 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:16:19,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:16:19,595 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-24 23:16:19,595 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:16:19,596 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1310117572] [2023-11-24 23:16:19,596 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1310117572] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:16:19,596 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 23:16:19,596 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-24 23:16:19,596 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [371049843] [2023-11-24 23:16:19,597 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:16:19,597 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-24 23:16:19,597 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:16:19,599 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-24 23:16:19,599 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-24 23:16:19,599 INFO L87 Difference]: Start difference. First operand 53 states and 63 transitions. Second operand has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:16:19,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:16:19,665 INFO L93 Difference]: Finished difference Result 52 states and 62 transitions. [2023-11-24 23:16:19,665 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-24 23:16:19,666 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2023-11-24 23:16:19,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:16:19,666 INFO L225 Difference]: With dead ends: 52 [2023-11-24 23:16:19,666 INFO L226 Difference]: Without dead ends: 52 [2023-11-24 23:16:19,667 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-11-24 23:16:19,669 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 56 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 57 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-24 23:16:19,670 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [56 Valid, 63 Invalid, 57 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-24 23:16:19,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2023-11-24 23:16:19,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2023-11-24 23:16:19,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 36 states have (on average 1.7222222222222223) internal successors, (62), 51 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:16:19,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 62 transitions. [2023-11-24 23:16:19,675 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 62 transitions. Word has length 10 [2023-11-24 23:16:19,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:16:19,676 INFO L495 AbstractCegarLoop]: Abstraction has 52 states and 62 transitions. [2023-11-24 23:16:19,676 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:16:19,676 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 62 transitions. [2023-11-24 23:16:19,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-11-24 23:16:19,677 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:16:19,677 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:16:19,677 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-11-24 23:16:19,677 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2023-11-24 23:16:19,678 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:16:19,678 INFO L85 PathProgramCache]: Analyzing trace with hash 283214351, now seen corresponding path program 1 times [2023-11-24 23:16:19,678 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:16:19,678 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1019229595] [2023-11-24 23:16:19,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:16:19,679 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:16:19,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:16:19,887 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-24 23:16:19,887 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:16:19,887 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1019229595] [2023-11-24 23:16:19,888 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1019229595] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:16:19,888 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [911609793] [2023-11-24 23:16:19,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:16:19,888 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:16:19,888 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cef2e947-cab8-4d9a-8154-39d4ac9ba1aa/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:16:19,889 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cef2e947-cab8-4d9a-8154-39d4ac9ba1aa/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:16:19,907 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cef2e947-cab8-4d9a-8154-39d4ac9ba1aa/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-24 23:16:19,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:16:19,978 INFO L262 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 15 conjunts are in the unsatisfiable core [2023-11-24 23:16:19,984 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:16:20,042 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-24 23:16:20,042 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:16:20,067 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 [2023-11-24 23:16:20,085 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-24 23:16:20,085 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [911609793] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 23:16:20,086 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2112624751] [2023-11-24 23:16:20,089 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-24 23:16:20,089 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:16:20,090 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-24 23:16:20,090 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-24 23:16:20,090 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-24 23:16:21,061 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-24 23:16:21,631 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [2112624751] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:16:21,631 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-11-24 23:16:21,631 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [4, 4, 4] total 14 [2023-11-24 23:16:21,632 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1693130662] [2023-11-24 23:16:21,632 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:16:21,632 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-24 23:16:21,633 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:16:21,633 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-24 23:16:21,633 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=174, Unknown=1, NotChecked=0, Total=240 [2023-11-24 23:16:21,633 INFO L87 Difference]: Start difference. First operand 52 states and 62 transitions. Second operand has 9 states, 8 states have (on average 1.25) internal successors, (10), 8 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:16:22,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:16:22,162 INFO L93 Difference]: Finished difference Result 51 states and 61 transitions. [2023-11-24 23:16:22,163 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-24 23:16:22,163 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 1.25) internal successors, (10), 8 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2023-11-24 23:16:22,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:16:22,164 INFO L225 Difference]: With dead ends: 51 [2023-11-24 23:16:22,164 INFO L226 Difference]: Without dead ends: 51 [2023-11-24 23:16:22,164 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=75, Invalid=195, Unknown=2, NotChecked=0, Total=272 [2023-11-24 23:16:22,165 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 97 mSDsluCounter, 107 mSDsCounter, 0 mSdLazyCounter, 214 mSolverCounterSat, 1 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 97 SdHoareTripleChecker+Valid, 130 SdHoareTripleChecker+Invalid, 216 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 214 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-24 23:16:22,165 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [97 Valid, 130 Invalid, 216 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 214 Invalid, 1 Unknown, 0 Unchecked, 0.3s Time] [2023-11-24 23:16:22,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2023-11-24 23:16:22,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2023-11-24 23:16:22,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 36 states have (on average 1.6944444444444444) internal successors, (61), 50 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:16:22,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 61 transitions. [2023-11-24 23:16:22,168 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 61 transitions. Word has length 10 [2023-11-24 23:16:22,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:16:22,168 INFO L495 AbstractCegarLoop]: Abstraction has 51 states and 61 transitions. [2023-11-24 23:16:22,168 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 1.25) internal successors, (10), 8 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:16:22,169 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 61 transitions. [2023-11-24 23:16:22,169 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-11-24 23:16:22,169 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:16:22,169 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:16:22,180 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cef2e947-cab8-4d9a-8154-39d4ac9ba1aa/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-11-24 23:16:22,370 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cef2e947-cab8-4d9a-8154-39d4ac9ba1aa/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-11-24 23:16:22,370 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr10REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2023-11-24 23:16:22,371 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:16:22,371 INFO L85 PathProgramCache]: Analyzing trace with hash 1586169068, now seen corresponding path program 1 times [2023-11-24 23:16:22,371 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:16:22,371 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1509681723] [2023-11-24 23:16:22,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:16:22,371 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:16:22,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:16:22,454 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-24 23:16:22,454 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:16:22,455 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1509681723] [2023-11-24 23:16:22,455 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1509681723] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:16:22,455 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 23:16:22,455 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-24 23:16:22,455 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2129977599] [2023-11-24 23:16:22,455 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:16:22,456 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-24 23:16:22,456 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:16:22,456 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-24 23:16:22,456 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-24 23:16:22,457 INFO L87 Difference]: Start difference. First operand 51 states and 61 transitions. Second operand has 5 states, 4 states have (on average 3.0) internal successors, (12), 5 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:16:22,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:16:22,558 INFO L93 Difference]: Finished difference Result 50 states and 60 transitions. [2023-11-24 23:16:22,558 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-24 23:16:22,559 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 3.0) internal successors, (12), 5 states have internal predecessors, (12), 0 states have call successors, (0), 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 12 [2023-11-24 23:16:22,559 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:16:22,559 INFO L225 Difference]: With dead ends: 50 [2023-11-24 23:16:22,559 INFO L226 Difference]: Without dead ends: 50 [2023-11-24 23:16:22,560 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2023-11-24 23:16:22,560 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 50 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 86 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 91 SdHoareTripleChecker+Invalid, 88 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 86 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-24 23:16:22,561 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [50 Valid, 91 Invalid, 88 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 86 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-24 23:16:22,561 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2023-11-24 23:16:22,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2023-11-24 23:16:22,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 36 states have (on average 1.6666666666666667) internal successors, (60), 49 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) [2023-11-24 23:16:22,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 60 transitions. [2023-11-24 23:16:22,564 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 60 transitions. Word has length 12 [2023-11-24 23:16:22,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:16:22,564 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 60 transitions. [2023-11-24 23:16:22,564 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 3.0) internal successors, (12), 5 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:16:22,565 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 60 transitions. [2023-11-24 23:16:22,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-11-24 23:16:22,565 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:16:22,565 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:16:22,566 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2023-11-24 23:16:22,566 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2023-11-24 23:16:22,566 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:16:22,566 INFO L85 PathProgramCache]: Analyzing trace with hash 1586169069, now seen corresponding path program 1 times [2023-11-24 23:16:22,567 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:16:22,567 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [522337467] [2023-11-24 23:16:22,567 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:16:22,567 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:16:22,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:16:22,966 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-24 23:16:22,966 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:16:22,966 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [522337467] [2023-11-24 23:16:22,967 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [522337467] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:16:22,967 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1644993461] [2023-11-24 23:16:22,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:16:22,967 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:16:22,967 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cef2e947-cab8-4d9a-8154-39d4ac9ba1aa/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:16:22,969 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cef2e947-cab8-4d9a-8154-39d4ac9ba1aa/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:16:22,989 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cef2e947-cab8-4d9a-8154-39d4ac9ba1aa/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-24 23:16:23,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:16:23,074 INFO L262 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 22 conjunts are in the unsatisfiable core [2023-11-24 23:16:23,076 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:16:23,145 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-24 23:16:23,164 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-24 23:16:23,165 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:16:23,173 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 11 [2023-11-24 23:16:23,180 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 14 treesize of output 12 [2023-11-24 23:16:23,232 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-24 23:16:23,232 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1644993461] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 23:16:23,233 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [318614527] [2023-11-24 23:16:23,235 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-11-24 23:16:23,235 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:16:23,236 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-24 23:16:23,236 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-24 23:16:23,236 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-24 23:16:24,287 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-24 23:16:25,428 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [318614527] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:16:25,429 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-11-24 23:16:25,429 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [8, 8, 8] total 25 [2023-11-24 23:16:25,429 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1092090602] [2023-11-24 23:16:25,429 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:16:25,430 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-11-24 23:16:25,430 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:16:25,430 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-11-24 23:16:25,431 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=507, Unknown=3, NotChecked=0, Total=600 [2023-11-24 23:16:25,431 INFO L87 Difference]: Start difference. First operand 50 states and 60 transitions. Second operand has 11 states, 10 states have (on average 1.2) internal successors, (12), 10 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:16:26,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:16:26,686 INFO L93 Difference]: Finished difference Result 53 states and 64 transitions. [2023-11-24 23:16:26,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-11-24 23:16:26,688 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 1.2) internal successors, (12), 10 states have internal predecessors, (12), 0 states have call successors, (0), 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 12 [2023-11-24 23:16:26,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:16:26,688 INFO L225 Difference]: With dead ends: 53 [2023-11-24 23:16:26,688 INFO L226 Difference]: Without dead ends: 53 [2023-11-24 23:16:26,689 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 178 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=110, Invalid=639, Unknown=7, NotChecked=0, Total=756 [2023-11-24 23:16:26,690 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 100 mSDsluCounter, 114 mSDsCounter, 0 mSdLazyCounter, 267 mSolverCounterSat, 1 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 100 SdHoareTripleChecker+Valid, 136 SdHoareTripleChecker+Invalid, 269 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 267 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-24 23:16:26,690 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [100 Valid, 136 Invalid, 269 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 267 Invalid, 1 Unknown, 0 Unchecked, 0.5s Time] [2023-11-24 23:16:26,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2023-11-24 23:16:26,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 51. [2023-11-24 23:16:26,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 37 states have (on average 1.6486486486486487) internal successors, (61), 50 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:16:26,693 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 61 transitions. [2023-11-24 23:16:26,693 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 61 transitions. Word has length 12 [2023-11-24 23:16:26,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:16:26,693 INFO L495 AbstractCegarLoop]: Abstraction has 51 states and 61 transitions. [2023-11-24 23:16:26,693 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 1.2) internal successors, (12), 10 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:16:26,694 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 61 transitions. [2023-11-24 23:16:26,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-11-24 23:16:26,694 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:16:26,694 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:16:26,707 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cef2e947-cab8-4d9a-8154-39d4ac9ba1aa/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-24 23:16:26,902 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cef2e947-cab8-4d9a-8154-39d4ac9ba1aa/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2023-11-24 23:16:26,903 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2023-11-24 23:16:26,903 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:16:26,904 INFO L85 PathProgramCache]: Analyzing trace with hash -404910887, now seen corresponding path program 1 times [2023-11-24 23:16:26,904 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:16:26,904 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1823283936] [2023-11-24 23:16:26,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:16:26,904 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:16:26,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:16:27,651 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-24 23:16:27,651 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:16:27,651 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1823283936] [2023-11-24 23:16:27,651 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1823283936] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:16:27,652 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1024586852] [2023-11-24 23:16:27,652 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:16:27,652 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:16:27,652 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cef2e947-cab8-4d9a-8154-39d4ac9ba1aa/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:16:27,660 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cef2e947-cab8-4d9a-8154-39d4ac9ba1aa/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:16:27,678 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cef2e947-cab8-4d9a-8154-39d4ac9ba1aa/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-24 23:16:27,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:16:27,773 INFO L262 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 22 conjunts are in the unsatisfiable core [2023-11-24 23:16:27,776 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:16:27,928 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2023-11-24 23:16:28,017 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-24 23:16:28,021 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-24 23:16:28,022 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 10 [2023-11-24 23:16:28,051 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-24 23:16:28,051 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:16:28,107 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 11 [2023-11-24 23:16:28,114 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 20 [2023-11-24 23:16:28,346 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-24 23:16:28,346 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1024586852] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 23:16:28,347 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1725484710] [2023-11-24 23:16:28,349 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-11-24 23:16:28,350 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:16:28,350 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-24 23:16:28,350 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-24 23:16:28,351 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-24 23:16:29,912 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-24 23:16:31,326 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1822#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 1 |#StackHeapBarrier|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrstr_~s#1.base|) (= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= (select |#length| |ULTIMATE.start_cstrlen_~s~0#1.base|) |ULTIMATE.start_cstrlen_~s~0#1.offset|) (= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= 2 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= 2 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 2 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 2 |ULTIMATE.start_cstrlen_~str#1.base|) (= |ULTIMATE.start_cstrstr_~s#1.offset| 0) (<= 2 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= 2 |ULTIMATE.start_cstrstr_#in~s#1.base|))' at error location [2023-11-24 23:16:31,326 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-24 23:16:31,327 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-24 23:16:31,327 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 7, 7] total 21 [2023-11-24 23:16:31,327 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [586443564] [2023-11-24 23:16:31,327 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-24 23:16:31,327 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2023-11-24 23:16:31,328 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:16:31,328 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2023-11-24 23:16:31,329 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=890, Unknown=0, NotChecked=0, Total=992 [2023-11-24 23:16:31,329 INFO L87 Difference]: Start difference. First operand 51 states and 61 transitions. Second operand has 22 states, 22 states have (on average 1.5909090909090908) internal successors, (35), 21 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) [2023-11-24 23:16:32,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:16:32,583 INFO L93 Difference]: Finished difference Result 64 states and 74 transitions. [2023-11-24 23:16:32,584 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-11-24 23:16:32,584 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.5909090909090908) internal successors, (35), 21 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 14 [2023-11-24 23:16:32,584 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:16:32,585 INFO L225 Difference]: With dead ends: 64 [2023-11-24 23:16:32,585 INFO L226 Difference]: Without dead ends: 64 [2023-11-24 23:16:32,586 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 18 SyntacticMatches, 2 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 349 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=194, Invalid=1446, Unknown=0, NotChecked=0, Total=1640 [2023-11-24 23:16:32,587 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 147 mSDsluCounter, 455 mSDsCounter, 0 mSdLazyCounter, 446 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 147 SdHoareTripleChecker+Valid, 486 SdHoareTripleChecker+Invalid, 448 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 446 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-24 23:16:32,587 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [147 Valid, 486 Invalid, 448 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 446 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-24 23:16:32,588 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2023-11-24 23:16:32,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 57. [2023-11-24 23:16:32,589 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 43 states have (on average 1.5813953488372092) internal successors, (68), 56 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:16:32,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 68 transitions. [2023-11-24 23:16:32,590 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 68 transitions. Word has length 14 [2023-11-24 23:16:32,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:16:32,590 INFO L495 AbstractCegarLoop]: Abstraction has 57 states and 68 transitions. [2023-11-24 23:16:32,590 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.5909090909090908) internal successors, (35), 21 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) [2023-11-24 23:16:32,590 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 68 transitions. [2023-11-24 23:16:32,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-11-24 23:16:32,591 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:16:32,591 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:16:32,603 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cef2e947-cab8-4d9a-8154-39d4ac9ba1aa/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-24 23:16:32,798 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cef2e947-cab8-4d9a-8154-39d4ac9ba1aa/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:16:32,799 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr24ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2023-11-24 23:16:32,799 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:16:32,799 INFO L85 PathProgramCache]: Analyzing trace with hash -401684085, now seen corresponding path program 1 times [2023-11-24 23:16:32,800 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:16:32,800 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [513979000] [2023-11-24 23:16:32,800 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:16:32,800 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:16:32,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:16:32,998 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-24 23:16:32,998 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:16:32,999 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [513979000] [2023-11-24 23:16:32,999 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [513979000] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:16:32,999 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 23:16:32,999 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-24 23:16:32,999 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1625823258] [2023-11-24 23:16:32,999 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:16:33,000 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-24 23:16:33,000 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:16:33,001 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-24 23:16:33,001 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-24 23:16:33,001 INFO L87 Difference]: Start difference. First operand 57 states and 68 transitions. Second operand has 4 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 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) [2023-11-24 23:16:33,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:16:33,058 INFO L93 Difference]: Finished difference Result 56 states and 67 transitions. [2023-11-24 23:16:33,058 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-24 23:16:33,058 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 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 14 [2023-11-24 23:16:33,059 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:16:33,059 INFO L225 Difference]: With dead ends: 56 [2023-11-24 23:16:33,059 INFO L226 Difference]: Without dead ends: 48 [2023-11-24 23:16:33,059 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-24 23:16:33,060 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 44 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-24 23:16:33,060 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [44 Valid, 64 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-24 23:16:33,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2023-11-24 23:16:33,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2023-11-24 23:16:33,063 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 35 states have (on average 1.6) internal successors, (56), 47 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:16:33,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 56 transitions. [2023-11-24 23:16:33,064 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 56 transitions. Word has length 14 [2023-11-24 23:16:33,064 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:16:33,064 INFO L495 AbstractCegarLoop]: Abstraction has 48 states and 56 transitions. [2023-11-24 23:16:33,064 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 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) [2023-11-24 23:16:33,064 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 56 transitions. [2023-11-24 23:16:33,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-11-24 23:16:33,065 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:16:33,065 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:16:33,065 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2023-11-24 23:16:33,065 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2023-11-24 23:16:33,066 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:16:33,066 INFO L85 PathProgramCache]: Analyzing trace with hash 1188930127, now seen corresponding path program 2 times [2023-11-24 23:16:33,066 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:16:33,066 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [121366963] [2023-11-24 23:16:33,066 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:16:33,066 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:16:33,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:16:33,599 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-24 23:16:33,599 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:16:33,599 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [121366963] [2023-11-24 23:16:33,599 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [121366963] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:16:33,599 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1895747486] [2023-11-24 23:16:33,599 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-24 23:16:33,599 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:16:33,600 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cef2e947-cab8-4d9a-8154-39d4ac9ba1aa/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:16:33,608 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cef2e947-cab8-4d9a-8154-39d4ac9ba1aa/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:16:33,612 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cef2e947-cab8-4d9a-8154-39d4ac9ba1aa/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-24 23:16:33,717 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-24 23:16:33,717 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-24 23:16:33,719 INFO L262 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 48 conjunts are in the unsatisfiable core [2023-11-24 23:16:33,721 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:16:33,729 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 1 [2023-11-24 23:16:33,758 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-11-24 23:16:33,952 INFO L349 Elim1Store]: treesize reduction 4, result has 76.5 percent of original size [2023-11-24 23:16:33,952 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 25 treesize of output 23 [2023-11-24 23:16:34,022 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-24 23:16:34,023 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:16:34,276 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 25 [2023-11-24 23:16:34,287 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 23 [2023-11-24 23:16:34,541 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-24 23:16:34,542 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1895747486] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 23:16:34,542 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [261488738] [2023-11-24 23:16:34,548 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-11-24 23:16:34,548 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:16:34,549 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-24 23:16:34,549 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-24 23:16:34,549 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-24 23:16:36,207 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-24 23:16:37,618 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2192#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 1 |#StackHeapBarrier|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrstr_~s#1.base|) (= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= (select |#length| |ULTIMATE.start_cstrlen_~s~0#1.base|) |ULTIMATE.start_cstrlen_~s~0#1.offset|) (= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= 2 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= 2 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 2 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 2 |ULTIMATE.start_cstrlen_~str#1.base|) (= |ULTIMATE.start_cstrstr_~s#1.offset| 0) (<= 2 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= 2 |ULTIMATE.start_cstrstr_#in~s#1.base|))' at error location [2023-11-24 23:16:37,618 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-24 23:16:37,618 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-24 23:16:37,618 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 6, 6] total 22 [2023-11-24 23:16:37,618 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [856075005] [2023-11-24 23:16:37,619 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-24 23:16:37,619 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2023-11-24 23:16:37,619 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:16:37,620 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2023-11-24 23:16:37,621 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=930, Unknown=2, NotChecked=0, Total=1056 [2023-11-24 23:16:37,621 INFO L87 Difference]: Start difference. First operand 48 states and 56 transitions. Second operand has 23 states, 23 states have (on average 1.7826086956521738) internal successors, (41), 22 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:16:38,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:16:38,962 INFO L93 Difference]: Finished difference Result 92 states and 108 transitions. [2023-11-24 23:16:38,962 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2023-11-24 23:16:38,962 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.7826086956521738) internal successors, (41), 22 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2023-11-24 23:16:38,963 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:16:38,965 INFO L225 Difference]: With dead ends: 92 [2023-11-24 23:16:38,965 INFO L226 Difference]: Without dead ends: 92 [2023-11-24 23:16:38,966 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 478 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=336, Invalid=2014, Unknown=2, NotChecked=0, Total=2352 [2023-11-24 23:16:38,967 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 402 mSDsluCounter, 254 mSDsCounter, 0 mSdLazyCounter, 472 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 402 SdHoareTripleChecker+Valid, 276 SdHoareTripleChecker+Invalid, 478 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 472 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-24 23:16:38,967 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [402 Valid, 276 Invalid, 478 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 472 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-24 23:16:38,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2023-11-24 23:16:38,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 58. [2023-11-24 23:16:38,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 45 states have (on average 1.511111111111111) internal successors, (68), 57 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:16:38,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 68 transitions. [2023-11-24 23:16:38,971 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 68 transitions. Word has length 16 [2023-11-24 23:16:38,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:16:38,971 INFO L495 AbstractCegarLoop]: Abstraction has 58 states and 68 transitions. [2023-11-24 23:16:38,972 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.7826086956521738) internal successors, (41), 22 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:16:38,972 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 68 transitions. [2023-11-24 23:16:38,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-24 23:16:38,973 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:16:38,973 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:16:38,985 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cef2e947-cab8-4d9a-8154-39d4ac9ba1aa/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-24 23:16:39,180 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cef2e947-cab8-4d9a-8154-39d4ac9ba1aa/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:16:39,180 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr12REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2023-11-24 23:16:39,180 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:16:39,181 INFO L85 PathProgramCache]: Analyzing trace with hash -1276933621, now seen corresponding path program 1 times [2023-11-24 23:16:39,181 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:16:39,181 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1933512125] [2023-11-24 23:16:39,181 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:16:39,181 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:16:39,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:16:39,267 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-24 23:16:39,267 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:16:39,267 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1933512125] [2023-11-24 23:16:39,268 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1933512125] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:16:39,268 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 23:16:39,268 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-24 23:16:39,268 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [925194171] [2023-11-24 23:16:39,268 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:16:39,269 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-24 23:16:39,271 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:16:39,272 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-24 23:16:39,272 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-24 23:16:39,272 INFO L87 Difference]: Start difference. First operand 58 states and 68 transitions. Second operand has 5 states, 4 states have (on average 4.25) internal successors, (17), 5 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:16:39,347 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:16:39,347 INFO L93 Difference]: Finished difference Result 57 states and 67 transitions. [2023-11-24 23:16:39,347 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-24 23:16:39,348 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 4.25) internal successors, (17), 5 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2023-11-24 23:16:39,348 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:16:39,348 INFO L225 Difference]: With dead ends: 57 [2023-11-24 23:16:39,349 INFO L226 Difference]: Without dead ends: 57 [2023-11-24 23:16:39,349 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2023-11-24 23:16:39,350 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 79 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 79 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 58 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-24 23:16:39,350 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [79 Valid, 49 Invalid, 58 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-24 23:16:39,351 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2023-11-24 23:16:39,353 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2023-11-24 23:16:39,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 45 states have (on average 1.488888888888889) internal successors, (67), 56 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:16:39,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 67 transitions. [2023-11-24 23:16:39,354 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 67 transitions. Word has length 19 [2023-11-24 23:16:39,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:16:39,355 INFO L495 AbstractCegarLoop]: Abstraction has 57 states and 67 transitions. [2023-11-24 23:16:39,355 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 4.25) internal successors, (17), 5 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:16:39,355 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 67 transitions. [2023-11-24 23:16:39,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-24 23:16:39,357 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:16:39,357 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:16:39,357 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2023-11-24 23:16:39,358 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2023-11-24 23:16:39,358 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:16:39,358 INFO L85 PathProgramCache]: Analyzing trace with hash -1276933620, now seen corresponding path program 1 times [2023-11-24 23:16:39,359 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:16:39,359 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [937399357] [2023-11-24 23:16:39,359 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:16:39,359 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:16:39,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:16:39,523 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-24 23:16:39,523 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:16:39,524 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [937399357] [2023-11-24 23:16:39,524 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [937399357] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:16:39,524 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [861108114] [2023-11-24 23:16:39,524 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:16:39,524 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:16:39,524 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cef2e947-cab8-4d9a-8154-39d4ac9ba1aa/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:16:39,525 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cef2e947-cab8-4d9a-8154-39d4ac9ba1aa/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:16:39,547 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cef2e947-cab8-4d9a-8154-39d4ac9ba1aa/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-24 23:16:39,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:16:39,633 INFO L262 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 19 conjunts are in the unsatisfiable core [2023-11-24 23:16:39,634 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:16:39,707 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-24 23:16:39,707 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:16:39,778 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 [2023-11-24 23:16:39,787 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-24 23:16:39,787 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [861108114] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 23:16:39,787 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1897475538] [2023-11-24 23:16:39,789 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-11-24 23:16:39,789 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:16:39,790 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-24 23:16:39,790 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-24 23:16:39,790 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-24 23:16:41,016 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-24 23:16:42,974 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [1897475538] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:16:42,974 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-11-24 23:16:42,974 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [4, 4, 4] total 17 [2023-11-24 23:16:42,975 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1208303261] [2023-11-24 23:16:42,975 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:16:42,975 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-11-24 23:16:42,975 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:16:42,976 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-11-24 23:16:42,976 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=266, Unknown=7, NotChecked=0, Total=342 [2023-11-24 23:16:42,977 INFO L87 Difference]: Start difference. First operand 57 states and 67 transitions. Second operand has 15 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:16:45,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:16:45,089 INFO L93 Difference]: Finished difference Result 62 states and 72 transitions. [2023-11-24 23:16:45,089 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-11-24 23:16:45,089 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2023-11-24 23:16:45,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:16:45,090 INFO L225 Difference]: With dead ends: 62 [2023-11-24 23:16:45,090 INFO L226 Difference]: Without dead ends: 62 [2023-11-24 23:16:45,090 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 41 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 114 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=124, Invalid=509, Unknown=17, NotChecked=0, Total=650 [2023-11-24 23:16:45,091 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 50 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 297 mSolverCounterSat, 1 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 107 SdHoareTripleChecker+Invalid, 299 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 297 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-11-24 23:16:45,091 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [50 Valid, 107 Invalid, 299 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 297 Invalid, 1 Unknown, 0 Unchecked, 0.6s Time] [2023-11-24 23:16:45,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2023-11-24 23:16:45,093 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2023-11-24 23:16:45,094 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 49 states have (on average 1.4489795918367347) internal successors, (71), 60 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:16:45,094 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 71 transitions. [2023-11-24 23:16:45,094 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 71 transitions. Word has length 19 [2023-11-24 23:16:45,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:16:45,094 INFO L495 AbstractCegarLoop]: Abstraction has 61 states and 71 transitions. [2023-11-24 23:16:45,095 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:16:45,095 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 71 transitions. [2023-11-24 23:16:45,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-11-24 23:16:45,096 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:16:45,096 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:16:45,109 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cef2e947-cab8-4d9a-8154-39d4ac9ba1aa/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-24 23:16:45,302 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cef2e947-cab8-4d9a-8154-39d4ac9ba1aa/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2023-11-24 23:16:45,302 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2023-11-24 23:16:45,303 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:16:45,303 INFO L85 PathProgramCache]: Analyzing trace with hash 325764145, now seen corresponding path program 3 times [2023-11-24 23:16:45,303 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:16:45,303 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1747104929] [2023-11-24 23:16:45,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:16:45,303 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:16:45,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:16:45,782 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-24 23:16:45,782 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:16:45,782 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1747104929] [2023-11-24 23:16:45,782 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1747104929] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:16:45,783 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [5752444] [2023-11-24 23:16:45,783 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-24 23:16:45,783 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:16:45,783 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cef2e947-cab8-4d9a-8154-39d4ac9ba1aa/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:16:45,784 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cef2e947-cab8-4d9a-8154-39d4ac9ba1aa/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:16:45,803 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cef2e947-cab8-4d9a-8154-39d4ac9ba1aa/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-24 23:16:45,902 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-24 23:16:45,902 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-24 23:16:45,904 INFO L262 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 44 conjunts are in the unsatisfiable core [2023-11-24 23:16:45,906 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:16:46,033 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2023-11-24 23:16:46,243 INFO L349 Elim1Store]: treesize reduction 9, result has 47.1 percent of original size [2023-11-24 23:16:46,244 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 28 treesize of output 18 [2023-11-24 23:16:46,247 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 3 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-24 23:16:46,247 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:16:46,366 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 27 [2023-11-24 23:16:46,373 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-24 23:16:46,373 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 31 treesize of output 23 [2023-11-24 23:16:46,512 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-24 23:16:46,512 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [5752444] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 23:16:46,513 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [320849920] [2023-11-24 23:16:46,515 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-11-24 23:16:46,515 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:16:46,515 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-24 23:16:46,515 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-24 23:16:46,515 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-24 23:16:47,603 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-24 23:16:48,966 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2915#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 1 |#StackHeapBarrier|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrstr_~s#1.base|) (= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= (select |#length| |ULTIMATE.start_cstrlen_~s~0#1.base|) |ULTIMATE.start_cstrlen_~s~0#1.offset|) (= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= 2 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= 2 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 2 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 2 |ULTIMATE.start_cstrlen_~str#1.base|) (= |ULTIMATE.start_cstrstr_~s#1.offset| 0) (<= 2 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= 2 |ULTIMATE.start_cstrstr_#in~s#1.base|))' at error location [2023-11-24 23:16:48,966 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-24 23:16:48,966 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-24 23:16:48,966 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 30 [2023-11-24 23:16:48,966 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [786921179] [2023-11-24 23:16:48,966 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-24 23:16:48,967 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2023-11-24 23:16:48,967 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:16:48,968 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2023-11-24 23:16:48,968 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=1407, Unknown=2, NotChecked=0, Total=1560 [2023-11-24 23:16:48,969 INFO L87 Difference]: Start difference. First operand 61 states and 71 transitions. Second operand has 30 states, 30 states have (on average 1.6) internal successors, (48), 30 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:16:50,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:16:50,386 INFO L93 Difference]: Finished difference Result 139 states and 161 transitions. [2023-11-24 23:16:50,386 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2023-11-24 23:16:50,387 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.6) internal successors, (48), 30 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 20 [2023-11-24 23:16:50,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:16:50,388 INFO L225 Difference]: With dead ends: 139 [2023-11-24 23:16:50,388 INFO L226 Difference]: Without dead ends: 139 [2023-11-24 23:16:50,390 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 30 SyntacticMatches, 3 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 2 DeprecatedPredicates, 851 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=426, Invalid=2878, Unknown=2, NotChecked=0, Total=3306 [2023-11-24 23:16:50,390 INFO L413 NwaCegarLoop]: 56 mSDtfsCounter, 265 mSDsluCounter, 907 mSDsCounter, 0 mSdLazyCounter, 726 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 265 SdHoareTripleChecker+Valid, 963 SdHoareTripleChecker+Invalid, 731 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 726 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-11-24 23:16:50,391 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [265 Valid, 963 Invalid, 731 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 726 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-11-24 23:16:50,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2023-11-24 23:16:50,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 71. [2023-11-24 23:16:50,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 59 states have (on average 1.4067796610169492) internal successors, (83), 70 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:16:50,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 83 transitions. [2023-11-24 23:16:50,394 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 83 transitions. Word has length 20 [2023-11-24 23:16:50,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:16:50,395 INFO L495 AbstractCegarLoop]: Abstraction has 71 states and 83 transitions. [2023-11-24 23:16:50,395 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 1.6) internal successors, (48), 30 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:16:50,395 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 83 transitions. [2023-11-24 23:16:50,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-11-24 23:16:50,396 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:16:50,396 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:16:50,427 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cef2e947-cab8-4d9a-8154-39d4ac9ba1aa/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-24 23:16:50,596 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cef2e947-cab8-4d9a-8154-39d4ac9ba1aa/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2023-11-24 23:16:50,597 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2023-11-24 23:16:50,597 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:16:50,598 INFO L85 PathProgramCache]: Analyzing trace with hash 2003200295, now seen corresponding path program 4 times [2023-11-24 23:16:50,598 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:16:50,598 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1247412668] [2023-11-24 23:16:50,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:16:50,598 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:16:50,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:16:51,076 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 6 proven. 14 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-24 23:16:51,076 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:16:51,076 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1247412668] [2023-11-24 23:16:51,076 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1247412668] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:16:51,076 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1349728872] [2023-11-24 23:16:51,077 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-24 23:16:51,077 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:16:51,077 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cef2e947-cab8-4d9a-8154-39d4ac9ba1aa/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:16:51,078 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cef2e947-cab8-4d9a-8154-39d4ac9ba1aa/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:16:51,107 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cef2e947-cab8-4d9a-8154-39d4ac9ba1aa/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-24 23:16:51,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:16:51,199 INFO L262 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 39 conjunts are in the unsatisfiable core [2023-11-24 23:16:51,201 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:16:51,354 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 12 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-24 23:16:51,354 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:16:51,577 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2023-11-24 23:16:51,650 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 12 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-24 23:16:51,650 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1349728872] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 23:16:51,650 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1973910090] [2023-11-24 23:16:51,653 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-11-24 23:16:51,653 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:16:51,653 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-24 23:16:51,653 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-24 23:16:51,653 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-24 23:16:52,899 INFO L180 IcfgInterpreter]: Interpretation finished