./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-invgen/string_concat-noarr.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0e0057cc Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_11c77a69-f6ac-4758-ba9a-9983e71b6557/bin/utaipan-verify-nQ1chXbOIh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_11c77a69-f6ac-4758-ba9a-9983e71b6557/bin/utaipan-verify-nQ1chXbOIh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_11c77a69-f6ac-4758-ba9a-9983e71b6557/bin/utaipan-verify-nQ1chXbOIh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_11c77a69-f6ac-4758-ba9a-9983e71b6557/bin/utaipan-verify-nQ1chXbOIh/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-invgen/string_concat-noarr.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_11c77a69-f6ac-4758-ba9a-9983e71b6557/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_11c77a69-f6ac-4758-ba9a-9983e71b6557/bin/utaipan-verify-nQ1chXbOIh --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 30a4b942034eaa47a8fcc8fdf4549d1d63a9a60d59b585da2a353c9626604750 --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-12-02 15:54:43,974 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-12-02 15:54:44,044 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_11c77a69-f6ac-4758-ba9a-9983e71b6557/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-12-02 15:54:44,050 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-12-02 15:54:44,051 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-12-02 15:54:44,076 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-12-02 15:54:44,076 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-12-02 15:54:44,077 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-12-02 15:54:44,078 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-12-02 15:54:44,078 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-12-02 15:54:44,079 INFO L153 SettingsManager]: * User list type=DISABLED [2023-12-02 15:54:44,079 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-12-02 15:54:44,080 INFO L153 SettingsManager]: * Explicit value domain=true [2023-12-02 15:54:44,080 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-12-02 15:54:44,080 INFO L153 SettingsManager]: * Octagon Domain=false [2023-12-02 15:54:44,081 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-12-02 15:54:44,081 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-12-02 15:54:44,082 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-12-02 15:54:44,082 INFO L153 SettingsManager]: * Interval Domain=false [2023-12-02 15:54:44,083 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-12-02 15:54:44,083 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-12-02 15:54:44,084 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-12-02 15:54:44,085 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-12-02 15:54:44,085 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-12-02 15:54:44,086 INFO L153 SettingsManager]: * sizeof long=4 [2023-12-02 15:54:44,086 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-12-02 15:54:44,086 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-12-02 15:54:44,087 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-12-02 15:54:44,087 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-12-02 15:54:44,088 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-12-02 15:54:44,088 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-12-02 15:54:44,088 INFO L153 SettingsManager]: * sizeof long double=12 [2023-12-02 15:54:44,089 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-12-02 15:54:44,089 INFO L153 SettingsManager]: * Use constant arrays=true [2023-12-02 15:54:44,089 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-12-02 15:54:44,090 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-12-02 15:54:44,090 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-12-02 15:54:44,090 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 15:54:44,090 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-12-02 15:54:44,091 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-12-02 15:54:44,091 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-12-02 15:54:44,091 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-12-02 15:54:44,091 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-12-02 15:54:44,092 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-12-02 15:54:44,092 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-12-02 15:54:44,092 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-12-02 15:54:44,092 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-12-02 15:54:44,092 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_11c77a69-f6ac-4758-ba9a-9983e71b6557/bin/utaipan-verify-nQ1chXbOIh/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_11c77a69-f6ac-4758-ba9a-9983e71b6557/bin/utaipan-verify-nQ1chXbOIh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 30a4b942034eaa47a8fcc8fdf4549d1d63a9a60d59b585da2a353c9626604750 [2023-12-02 15:54:44,331 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-12-02 15:54:44,357 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-12-02 15:54:44,359 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-12-02 15:54:44,361 INFO L270 PluginConnector]: Initializing CDTParser... [2023-12-02 15:54:44,361 INFO L274 PluginConnector]: CDTParser initialized [2023-12-02 15:54:44,362 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_11c77a69-f6ac-4758-ba9a-9983e71b6557/bin/utaipan-verify-nQ1chXbOIh/../../sv-benchmarks/c/loop-invgen/string_concat-noarr.i [2023-12-02 15:54:47,462 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-12-02 15:54:47,658 INFO L384 CDTParser]: Found 1 translation units. [2023-12-02 15:54:47,659 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_11c77a69-f6ac-4758-ba9a-9983e71b6557/sv-benchmarks/c/loop-invgen/string_concat-noarr.i [2023-12-02 15:54:47,668 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_11c77a69-f6ac-4758-ba9a-9983e71b6557/bin/utaipan-verify-nQ1chXbOIh/data/930e11491/15ada9286c9644e1af4330abd8ff9309/FLAGdbd0e2057 [2023-12-02 15:54:47,686 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_11c77a69-f6ac-4758-ba9a-9983e71b6557/bin/utaipan-verify-nQ1chXbOIh/data/930e11491/15ada9286c9644e1af4330abd8ff9309 [2023-12-02 15:54:47,689 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-12-02 15:54:47,691 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-12-02 15:54:47,693 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-12-02 15:54:47,693 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-12-02 15:54:47,699 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-12-02 15:54:47,700 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 03:54:47" (1/1) ... [2023-12-02 15:54:47,701 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@128152fe and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:54:47, skipping insertion in model container [2023-12-02 15:54:47,701 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 03:54:47" (1/1) ... [2023-12-02 15:54:47,725 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-02 15:54:47,873 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_11c77a69-f6ac-4758-ba9a-9983e71b6557/sv-benchmarks/c/loop-invgen/string_concat-noarr.i[893,906] [2023-12-02 15:54:47,886 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 15:54:47,896 INFO L202 MainTranslator]: Completed pre-run [2023-12-02 15:54:47,909 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_11c77a69-f6ac-4758-ba9a-9983e71b6557/sv-benchmarks/c/loop-invgen/string_concat-noarr.i[893,906] [2023-12-02 15:54:47,913 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 15:54:47,927 INFO L206 MainTranslator]: Completed translation [2023-12-02 15:54:47,928 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:54:47 WrapperNode [2023-12-02 15:54:47,928 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-12-02 15:54:47,929 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-12-02 15:54:47,929 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-12-02 15:54:47,929 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-12-02 15:54:47,936 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:54:47" (1/1) ... [2023-12-02 15:54:47,941 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:54:47" (1/1) ... [2023-12-02 15:54:47,958 INFO L138 Inliner]: procedures = 16, calls = 7, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 54 [2023-12-02 15:54:47,958 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-12-02 15:54:47,959 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-12-02 15:54:47,959 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-12-02 15:54:47,959 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-12-02 15:54:47,966 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:54:47" (1/1) ... [2023-12-02 15:54:47,967 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:54:47" (1/1) ... [2023-12-02 15:54:47,968 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:54:47" (1/1) ... [2023-12-02 15:54:47,968 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:54:47" (1/1) ... [2023-12-02 15:54:47,972 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:54:47" (1/1) ... [2023-12-02 15:54:47,975 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:54:47" (1/1) ... [2023-12-02 15:54:47,976 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:54:47" (1/1) ... [2023-12-02 15:54:47,977 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:54:47" (1/1) ... [2023-12-02 15:54:47,979 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-12-02 15:54:47,980 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-12-02 15:54:47,980 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-12-02 15:54:47,981 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-12-02 15:54:47,982 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:54:47" (1/1) ... [2023-12-02 15:54:47,989 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 15:54:48,000 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_11c77a69-f6ac-4758-ba9a-9983e71b6557/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:54:48,015 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_11c77a69-f6ac-4758-ba9a-9983e71b6557/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-12-02 15:54:48,018 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_11c77a69-f6ac-4758-ba9a-9983e71b6557/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-12-02 15:54:48,049 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-12-02 15:54:48,049 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-12-02 15:54:48,050 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-12-02 15:54:48,050 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-12-02 15:54:48,129 INFO L241 CfgBuilder]: Building ICFG [2023-12-02 15:54:48,132 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-12-02 15:54:48,264 INFO L282 CfgBuilder]: Performing block encoding [2023-12-02 15:54:48,293 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-12-02 15:54:48,294 INFO L309 CfgBuilder]: Removed 2 assume(true) statements. [2023-12-02 15:54:48,295 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 03:54:48 BoogieIcfgContainer [2023-12-02 15:54:48,296 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-12-02 15:54:48,299 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-12-02 15:54:48,299 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-12-02 15:54:48,303 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-12-02 15:54:48,303 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 03:54:47" (1/3) ... [2023-12-02 15:54:48,304 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7b451b23 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 03:54:48, skipping insertion in model container [2023-12-02 15:54:48,304 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:54:47" (2/3) ... [2023-12-02 15:54:48,305 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7b451b23 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 03:54:48, skipping insertion in model container [2023-12-02 15:54:48,305 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 03:54:48" (3/3) ... [2023-12-02 15:54:48,307 INFO L112 eAbstractionObserver]: Analyzing ICFG string_concat-noarr.i [2023-12-02 15:54:48,329 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-12-02 15:54:48,329 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-12-02 15:54:48,380 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-12-02 15:54:48,389 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=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopHeads, 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;@21574d32, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-12-02 15:54:48,389 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-12-02 15:54:48,394 INFO L276 IsEmpty]: Start isEmpty. Operand has 13 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 12 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:54:48,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-12-02 15:54:48,402 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:54:48,403 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-12-02 15:54:48,404 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:54:48,410 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:54:48,410 INFO L85 PathProgramCache]: Analyzing trace with hash -361152758, now seen corresponding path program 1 times [2023-12-02 15:54:48,421 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:54:48,422 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1565208207] [2023-12-02 15:54:48,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:54:48,423 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:54:48,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:54:48,576 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 15:54:48,577 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:54:48,578 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1565208207] [2023-12-02 15:54:48,578 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1565208207] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:54:48,579 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 15:54:48,579 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-12-02 15:54:48,581 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1077922316] [2023-12-02 15:54:48,582 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:54:48,587 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-12-02 15:54:48,587 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:54:48,623 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-12-02 15:54:48,624 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-12-02 15:54:48,627 INFO L87 Difference]: Start difference. First operand has 13 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 12 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) Second operand has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:54:48,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:54:48,651 INFO L93 Difference]: Finished difference Result 23 states and 33 transitions. [2023-12-02 15:54:48,653 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-12-02 15:54:48,655 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2023-12-02 15:54:48,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:54:48,665 INFO L225 Difference]: With dead ends: 23 [2023-12-02 15:54:48,665 INFO L226 Difference]: Without dead ends: 10 [2023-12-02 15:54:48,669 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-12-02 15:54:48,674 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 2 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 2 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 2 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 15:54:48,675 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 14 Invalid, 2 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 2 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 15:54:48,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2023-12-02 15:54:48,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2023-12-02 15:54:48,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:54:48,712 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 11 transitions. [2023-12-02 15:54:48,713 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 11 transitions. Word has length 7 [2023-12-02 15:54:48,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:54:48,714 INFO L495 AbstractCegarLoop]: Abstraction has 10 states and 11 transitions. [2023-12-02 15:54:48,714 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:54:48,715 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 11 transitions. [2023-12-02 15:54:48,715 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-12-02 15:54:48,715 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:54:48,715 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 15:54:48,716 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-12-02 15:54:48,716 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:54:48,717 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:54:48,717 INFO L85 PathProgramCache]: Analyzing trace with hash -18772081, now seen corresponding path program 1 times [2023-12-02 15:54:48,717 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:54:48,718 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1023778719] [2023-12-02 15:54:48,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:54:48,718 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:54:48,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:54:48,981 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 15:54:48,981 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:54:48,982 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1023778719] [2023-12-02 15:54:48,982 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1023778719] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:54:48,982 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 15:54:48,983 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 15:54:48,983 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1776826516] [2023-12-02 15:54:48,983 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:54:48,985 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 15:54:48,985 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:54:48,986 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 15:54:48,987 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 15:54:48,987 INFO L87 Difference]: Start difference. First operand 10 states and 11 transitions. Second operand has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:54:49,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:54:49,043 INFO L93 Difference]: Finished difference Result 19 states and 21 transitions. [2023-12-02 15:54:49,044 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 15:54:49,044 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2023-12-02 15:54:49,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:54:49,045 INFO L225 Difference]: With dead ends: 19 [2023-12-02 15:54:49,045 INFO L226 Difference]: Without dead ends: 15 [2023-12-02 15:54:49,046 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 [2023-12-02 15:54:49,048 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 1 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 15:54:49,049 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 11 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 15:54:49,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2023-12-02 15:54:49,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 12. [2023-12-02 15:54:49,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:54:49,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 13 transitions. [2023-12-02 15:54:49,054 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 13 transitions. Word has length 9 [2023-12-02 15:54:49,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:54:49,055 INFO L495 AbstractCegarLoop]: Abstraction has 12 states and 13 transitions. [2023-12-02 15:54:49,055 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:54:49,055 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 13 transitions. [2023-12-02 15:54:49,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-12-02 15:54:49,056 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:54:49,056 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 15:54:49,056 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-12-02 15:54:49,057 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:54:49,058 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:54:49,058 INFO L85 PathProgramCache]: Analyzing trace with hash -815238806, now seen corresponding path program 1 times [2023-12-02 15:54:49,058 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:54:49,058 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [370922161] [2023-12-02 15:54:49,059 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:54:49,059 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:54:49,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:54:49,176 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 15:54:49,177 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:54:49,177 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [370922161] [2023-12-02 15:54:49,177 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [370922161] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:54:49,178 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1192836118] [2023-12-02 15:54:49,178 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:54:49,178 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:54:49,178 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_11c77a69-f6ac-4758-ba9a-9983e71b6557/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:54:49,180 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_11c77a69-f6ac-4758-ba9a-9983e71b6557/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:54:49,184 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_11c77a69-f6ac-4758-ba9a-9983e71b6557/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-12-02 15:54:49,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:54:49,237 INFO L262 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 8 conjunts are in the unsatisfiable core [2023-12-02 15:54:49,242 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:54:49,297 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 15:54:49,298 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 15:54:49,342 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 15:54:49,343 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1192836118] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 15:54:49,343 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1691572466] [2023-12-02 15:54:49,361 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-12-02 15:54:49,361 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 15:54:49,365 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 15:54:49,372 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 15:54:49,372 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 15:54:49,703 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 15:54:50,073 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '168#(and (<= 200 |ULTIMATE.start_main_~i~0#1|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (exists ((|v_ULTIMATE.start_main_#t~nondet3#1_21| Int)) (and (or (= |v_ULTIMATE.start_main_#t~nondet3#1_21| 0) (< 999999 |ULTIMATE.start_main_~i~0#1|)) (<= 0 (+ |v_ULTIMATE.start_main_#t~nondet3#1_21| 2147483648)) (<= |v_ULTIMATE.start_main_#t~nondet3#1_21| 2147483647))) (<= |ULTIMATE.start_main_~j~0#1| 99) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 15:54:50,073 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 15:54:50,074 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 15:54:50,074 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2023-12-02 15:54:50,074 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1844768276] [2023-12-02 15:54:50,074 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 15:54:50,075 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-12-02 15:54:50,075 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:54:50,076 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-12-02 15:54:50,076 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=162, Unknown=0, NotChecked=0, Total=210 [2023-12-02 15:54:50,077 INFO L87 Difference]: Start difference. First operand 12 states and 13 transitions. Second operand has 8 states, 8 states have (on average 2.75) internal successors, (22), 7 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:54:50,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:54:50,181 INFO L93 Difference]: Finished difference Result 42 states and 49 transitions. [2023-12-02 15:54:50,182 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-12-02 15:54:50,182 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.75) internal successors, (22), 7 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2023-12-02 15:54:50,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:54:50,183 INFO L225 Difference]: With dead ends: 42 [2023-12-02 15:54:50,183 INFO L226 Difference]: Without dead ends: 34 [2023-12-02 15:54:50,184 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=69, Invalid=237, Unknown=0, NotChecked=0, Total=306 [2023-12-02 15:54:50,185 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 12 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 15:54:50,186 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 20 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 15:54:50,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2023-12-02 15:54:50,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 24. [2023-12-02 15:54:50,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.173913043478261) internal successors, (27), 23 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:54:50,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 27 transitions. [2023-12-02 15:54:50,191 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 27 transitions. Word has length 11 [2023-12-02 15:54:50,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:54:50,191 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 27 transitions. [2023-12-02 15:54:50,192 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.75) internal successors, (22), 7 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:54:50,192 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 27 transitions. [2023-12-02 15:54:50,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-12-02 15:54:50,192 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:54:50,193 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 15:54:50,199 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_11c77a69-f6ac-4758-ba9a-9983e71b6557/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-12-02 15:54:50,393 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_11c77a69-f6ac-4758-ba9a-9983e71b6557/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:54:50,393 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:54:50,394 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:54:50,394 INFO L85 PathProgramCache]: Analyzing trace with hash -1794533765, now seen corresponding path program 2 times [2023-12-02 15:54:50,394 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:54:50,394 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [554593849] [2023-12-02 15:54:50,394 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:54:50,394 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:54:50,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:54:50,529 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 15:54:50,529 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:54:50,529 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [554593849] [2023-12-02 15:54:50,529 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [554593849] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:54:50,529 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [931702547] [2023-12-02 15:54:50,530 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 15:54:50,530 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:54:50,530 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_11c77a69-f6ac-4758-ba9a-9983e71b6557/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:54:50,534 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_11c77a69-f6ac-4758-ba9a-9983e71b6557/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:54:50,537 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_11c77a69-f6ac-4758-ba9a-9983e71b6557/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-12-02 15:54:50,587 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2023-12-02 15:54:50,587 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 15:54:50,588 INFO L262 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 11 conjunts are in the unsatisfiable core [2023-12-02 15:54:50,589 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:54:50,623 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 15:54:50,624 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 15:54:50,728 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 15:54:50,728 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [931702547] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 15:54:50,728 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [139246647] [2023-12-02 15:54:50,731 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-12-02 15:54:50,731 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 15:54:50,732 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 15:54:50,732 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 15:54:50,732 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 15:54:50,962 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 15:54:51,360 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '377#(and (<= 200 |ULTIMATE.start_main_~i~0#1|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 99) (exists ((|v_ULTIMATE.start_main_#t~nondet3#1_31| Int)) (and (<= |v_ULTIMATE.start_main_#t~nondet3#1_31| 2147483647) (<= 0 (+ |v_ULTIMATE.start_main_#t~nondet3#1_31| 2147483648)) (or (= |v_ULTIMATE.start_main_#t~nondet3#1_31| 0) (< 999999 |ULTIMATE.start_main_~i~0#1|)))) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 15:54:51,360 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 15:54:51,360 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 15:54:51,361 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2023-12-02 15:54:51,361 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [65665674] [2023-12-02 15:54:51,361 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 15:54:51,362 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-12-02 15:54:51,362 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:54:51,363 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-12-02 15:54:51,363 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=309, Unknown=0, NotChecked=0, Total=420 [2023-12-02 15:54:51,363 INFO L87 Difference]: Start difference. First operand 24 states and 27 transitions. Second operand has 14 states, 14 states have (on average 2.4285714285714284) internal successors, (34), 13 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:54:51,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:54:51,576 INFO L93 Difference]: Finished difference Result 86 states and 102 transitions. [2023-12-02 15:54:51,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2023-12-02 15:54:51,577 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.4285714285714284) internal successors, (34), 13 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2023-12-02 15:54:51,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:54:51,581 INFO L225 Difference]: With dead ends: 86 [2023-12-02 15:54:51,581 INFO L226 Difference]: Without dead ends: 72 [2023-12-02 15:54:51,582 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 169 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=171, Invalid=531, Unknown=0, NotChecked=0, Total=702 [2023-12-02 15:54:51,583 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 49 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 66 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 104 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 66 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 15:54:51,584 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [49 Valid, 33 Invalid, 104 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 66 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 15:54:51,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2023-12-02 15:54:51,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 45. [2023-12-02 15:54:51,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 44 states have (on average 1.1590909090909092) internal successors, (51), 44 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:54:51,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 51 transitions. [2023-12-02 15:54:51,595 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 51 transitions. Word has length 17 [2023-12-02 15:54:51,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:54:51,596 INFO L495 AbstractCegarLoop]: Abstraction has 45 states and 51 transitions. [2023-12-02 15:54:51,596 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.4285714285714284) internal successors, (34), 13 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:54:51,596 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 51 transitions. [2023-12-02 15:54:51,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2023-12-02 15:54:51,597 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:54:51,597 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 15:54:51,603 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_11c77a69-f6ac-4758-ba9a-9983e71b6557/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-12-02 15:54:51,800 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_11c77a69-f6ac-4758-ba9a-9983e71b6557/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:54:51,800 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:54:51,800 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:54:51,800 INFO L85 PathProgramCache]: Analyzing trace with hash -896926115, now seen corresponding path program 3 times [2023-12-02 15:54:51,801 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:54:51,801 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1457726647] [2023-12-02 15:54:51,801 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:54:51,801 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:54:51,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:54:52,050 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 15:54:52,051 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:54:52,051 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1457726647] [2023-12-02 15:54:52,051 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1457726647] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:54:52,051 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1063874134] [2023-12-02 15:54:52,051 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 15:54:52,051 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:54:52,052 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_11c77a69-f6ac-4758-ba9a-9983e71b6557/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:54:52,052 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_11c77a69-f6ac-4758-ba9a-9983e71b6557/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:54:52,055 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_11c77a69-f6ac-4758-ba9a-9983e71b6557/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-12-02 15:54:52,108 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 15:54:52,109 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 15:54:52,110 INFO L262 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 17 conjunts are in the unsatisfiable core [2023-12-02 15:54:52,112 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:54:52,166 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 15:54:52,166 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 15:54:52,417 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 15:54:52,417 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1063874134] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 15:54:52,417 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [762922823] [2023-12-02 15:54:52,420 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-12-02 15:54:52,420 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 15:54:52,420 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 15:54:52,420 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 15:54:52,421 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 15:54:52,552 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 15:54:52,939 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '766#(and (<= 200 |ULTIMATE.start_main_~i~0#1|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 99) (exists ((|v_ULTIMATE.start_main_#t~nondet3#1_47| Int)) (and (or (= |v_ULTIMATE.start_main_#t~nondet3#1_47| 0) (< 999999 |ULTIMATE.start_main_~i~0#1|)) (<= 0 (+ |v_ULTIMATE.start_main_#t~nondet3#1_47| 2147483648)) (<= |v_ULTIMATE.start_main_#t~nondet3#1_47| 2147483647))) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 15:54:52,939 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 15:54:52,940 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 15:54:52,940 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 25 [2023-12-02 15:54:52,940 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [111383472] [2023-12-02 15:54:52,940 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 15:54:52,941 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2023-12-02 15:54:52,941 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:54:52,942 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2023-12-02 15:54:52,943 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=345, Invalid=711, Unknown=0, NotChecked=0, Total=1056 [2023-12-02 15:54:52,943 INFO L87 Difference]: Start difference. First operand 45 states and 51 transitions. Second operand has 26 states, 26 states have (on average 2.230769230769231) internal successors, (58), 25 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:54:53,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:54:53,447 INFO L93 Difference]: Finished difference Result 206 states and 240 transitions. [2023-12-02 15:54:53,448 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2023-12-02 15:54:53,448 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.230769230769231) internal successors, (58), 25 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 29 [2023-12-02 15:54:53,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:54:53,451 INFO L225 Difference]: With dead ends: 206 [2023-12-02 15:54:53,451 INFO L226 Difference]: Without dead ends: 180 [2023-12-02 15:54:53,453 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 433 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=537, Invalid=1443, Unknown=0, NotChecked=0, Total=1980 [2023-12-02 15:54:53,454 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 195 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 128 mSolverCounterSat, 103 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 195 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 231 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 103 IncrementalHoareTripleChecker+Valid, 128 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 15:54:53,454 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [195 Valid, 62 Invalid, 231 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [103 Valid, 128 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 15:54:53,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2023-12-02 15:54:53,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 87. [2023-12-02 15:54:53,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 86 states have (on average 1.1511627906976745) internal successors, (99), 86 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:54:53,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 99 transitions. [2023-12-02 15:54:53,471 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 99 transitions. Word has length 29 [2023-12-02 15:54:53,471 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:54:53,471 INFO L495 AbstractCegarLoop]: Abstraction has 87 states and 99 transitions. [2023-12-02 15:54:53,471 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.230769230769231) internal successors, (58), 25 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:54:53,472 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 99 transitions. [2023-12-02 15:54:53,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2023-12-02 15:54:53,474 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:54:53,474 INFO L195 NwaCegarLoop]: trace histogram [23, 22, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 15:54:53,480 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_11c77a69-f6ac-4758-ba9a-9983e71b6557/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-12-02 15:54:53,676 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_11c77a69-f6ac-4758-ba9a-9983e71b6557/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:54:53,676 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:54:53,677 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:54:53,677 INFO L85 PathProgramCache]: Analyzing trace with hash -562887391, now seen corresponding path program 4 times [2023-12-02 15:54:53,677 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:54:53,677 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1339626377] [2023-12-02 15:54:53,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:54:53,677 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:54:53,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:54:54,404 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 15:54:54,404 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:54:54,404 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1339626377] [2023-12-02 15:54:54,404 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1339626377] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:54:54,405 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1034501753] [2023-12-02 15:54:54,405 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 15:54:54,405 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:54:54,405 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_11c77a69-f6ac-4758-ba9a-9983e71b6557/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:54:54,406 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_11c77a69-f6ac-4758-ba9a-9983e71b6557/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:54:54,407 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_11c77a69-f6ac-4758-ba9a-9983e71b6557/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-12-02 15:54:54,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:54:54,479 INFO L262 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 29 conjunts are in the unsatisfiable core [2023-12-02 15:54:54,483 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:54:54,585 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 15:54:54,585 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 15:54:55,265 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 15:54:55,265 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1034501753] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 15:54:55,266 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [798169686] [2023-12-02 15:54:55,267 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-12-02 15:54:55,267 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 15:54:55,268 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 15:54:55,268 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 15:54:55,268 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 15:54:55,364 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 15:54:55,670 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1563#(and (<= 200 |ULTIMATE.start_main_~i~0#1|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (exists ((|v_ULTIMATE.start_main_#t~nondet3#1_75| Int)) (and (<= |v_ULTIMATE.start_main_#t~nondet3#1_75| 2147483647) (<= 0 (+ |v_ULTIMATE.start_main_#t~nondet3#1_75| 2147483648)) (or (< 999999 |ULTIMATE.start_main_~i~0#1|) (= |v_ULTIMATE.start_main_#t~nondet3#1_75| 0)))) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 99) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 15:54:55,670 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 15:54:55,670 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 15:54:55,670 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 49 [2023-12-02 15:54:55,670 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1686527526] [2023-12-02 15:54:55,671 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 15:54:55,671 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2023-12-02 15:54:55,671 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:54:55,673 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2023-12-02 15:54:55,674 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1245, Invalid=1947, Unknown=0, NotChecked=0, Total=3192 [2023-12-02 15:54:55,675 INFO L87 Difference]: Start difference. First operand 87 states and 99 transitions. Second operand has 50 states, 50 states have (on average 2.12) internal successors, (106), 49 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:54:56,802 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:54:56,802 INFO L93 Difference]: Finished difference Result 554 states and 624 transitions. [2023-12-02 15:54:56,802 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2023-12-02 15:54:56,803 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 2.12) internal successors, (106), 49 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 53 [2023-12-02 15:54:56,803 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:54:56,807 INFO L225 Difference]: With dead ends: 554 [2023-12-02 15:54:56,807 INFO L226 Difference]: Without dead ends: 504 [2023-12-02 15:54:56,810 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 127 SyntacticMatches, 0 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1177 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1917, Invalid=4563, Unknown=0, NotChecked=0, Total=6480 [2023-12-02 15:54:56,811 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 480 mSDsluCounter, 103 mSDsCounter, 0 mSdLazyCounter, 228 mSolverCounterSat, 228 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 480 SdHoareTripleChecker+Valid, 107 SdHoareTripleChecker+Invalid, 456 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 228 IncrementalHoareTripleChecker+Valid, 228 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 15:54:56,811 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [480 Valid, 107 Invalid, 456 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [228 Valid, 228 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 15:54:56,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 504 states. [2023-12-02 15:54:56,839 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 504 to 171. [2023-12-02 15:54:56,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 171 states, 170 states have (on average 1.1470588235294117) internal successors, (195), 170 states have internal predecessors, (195), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:54:56,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 195 transitions. [2023-12-02 15:54:56,842 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 195 transitions. Word has length 53 [2023-12-02 15:54:56,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:54:56,842 INFO L495 AbstractCegarLoop]: Abstraction has 171 states and 195 transitions. [2023-12-02 15:54:56,843 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 2.12) internal successors, (106), 49 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:54:56,843 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 195 transitions. [2023-12-02 15:54:56,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2023-12-02 15:54:56,846 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:54:56,847 INFO L195 NwaCegarLoop]: trace histogram [47, 46, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 15:54:56,852 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_11c77a69-f6ac-4758-ba9a-9983e71b6557/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-12-02 15:54:57,047 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_11c77a69-f6ac-4758-ba9a-9983e71b6557/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-12-02 15:54:57,048 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:54:57,048 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:54:57,048 INFO L85 PathProgramCache]: Analyzing trace with hash 2063855273, now seen corresponding path program 5 times [2023-12-02 15:54:57,048 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:54:57,048 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1972376246] [2023-12-02 15:54:57,048 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:54:57,049 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:54:57,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:54:59,187 INFO L134 CoverageAnalysis]: Checked inductivity of 2162 backedges. 0 proven. 2162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 15:54:59,187 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:54:59,187 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1972376246] [2023-12-02 15:54:59,187 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1972376246] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:54:59,187 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [531001482] [2023-12-02 15:54:59,187 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 15:54:59,188 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:54:59,188 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_11c77a69-f6ac-4758-ba9a-9983e71b6557/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:54:59,189 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_11c77a69-f6ac-4758-ba9a-9983e71b6557/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:54:59,192 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_11c77a69-f6ac-4758-ba9a-9983e71b6557/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-12-02 15:54:59,353 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 47 check-sat command(s) [2023-12-02 15:54:59,353 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 15:54:59,356 INFO L262 TraceCheckSpWp]: Trace formula consists of 404 conjuncts, 53 conjunts are in the unsatisfiable core [2023-12-02 15:54:59,363 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:54:59,546 INFO L134 CoverageAnalysis]: Checked inductivity of 2162 backedges. 0 proven. 2162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 15:54:59,547 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 15:55:02,030 INFO L134 CoverageAnalysis]: Checked inductivity of 2162 backedges. 0 proven. 2162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 15:55:02,030 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [531001482] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 15:55:02,030 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1504232209] [2023-12-02 15:55:02,033 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-12-02 15:55:02,033 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 15:55:02,033 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 15:55:02,033 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 15:55:02,034 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 15:55:02,143 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 15:55:02,579 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3338#(and (<= 200 |ULTIMATE.start_main_~i~0#1|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 99) (exists ((|v_ULTIMATE.start_main_#t~nondet3#1_127| Int)) (and (<= |v_ULTIMATE.start_main_#t~nondet3#1_127| 2147483647) (<= 0 (+ |v_ULTIMATE.start_main_#t~nondet3#1_127| 2147483648)) (or (= |v_ULTIMATE.start_main_#t~nondet3#1_127| 0) (< 999999 |ULTIMATE.start_main_~i~0#1|)))) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 15:55:02,579 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 15:55:02,580 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 15:55:02,580 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 97 [2023-12-02 15:55:02,580 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [204396840] [2023-12-02 15:55:02,580 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 15:55:02,581 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 98 states [2023-12-02 15:55:02,581 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:55:02,584 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2023-12-02 15:55:02,588 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4773, Invalid=6147, Unknown=0, NotChecked=0, Total=10920 [2023-12-02 15:55:02,588 INFO L87 Difference]: Start difference. First operand 171 states and 195 transitions. Second operand has 98 states, 98 states have (on average 2.061224489795918) internal successors, (202), 97 states have internal predecessors, (202), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:55:06,723 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:55:06,723 INFO L93 Difference]: Finished difference Result 1682 states and 1824 transitions. [2023-12-02 15:55:06,723 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 144 states. [2023-12-02 15:55:06,724 INFO L78 Accepts]: Start accepts. Automaton has has 98 states, 98 states have (on average 2.061224489795918) internal successors, (202), 97 states have internal predecessors, (202), 0 states have call successors, (0), 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 101 [2023-12-02 15:55:06,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:55:06,730 INFO L225 Difference]: With dead ends: 1682 [2023-12-02 15:55:06,730 INFO L226 Difference]: Without dead ends: 1584 [2023-12-02 15:55:06,737 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 398 GetRequests, 247 SyntacticMatches, 0 SemanticMatches, 151 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3529 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=7269, Invalid=15987, Unknown=0, NotChecked=0, Total=23256 [2023-12-02 15:55:06,738 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 1237 mSDsluCounter, 202 mSDsCounter, 0 mSdLazyCounter, 454 mSolverCounterSat, 548 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1237 SdHoareTripleChecker+Valid, 206 SdHoareTripleChecker+Invalid, 1002 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 548 IncrementalHoareTripleChecker+Valid, 454 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2023-12-02 15:55:06,738 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1237 Valid, 206 Invalid, 1002 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [548 Valid, 454 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-12-02 15:55:06,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1584 states. [2023-12-02 15:55:06,793 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1584 to 339. [2023-12-02 15:55:06,794 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 339 states, 338 states have (on average 1.1449704142011834) internal successors, (387), 338 states have internal predecessors, (387), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:55:06,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 339 states to 339 states and 387 transitions. [2023-12-02 15:55:06,795 INFO L78 Accepts]: Start accepts. Automaton has 339 states and 387 transitions. Word has length 101 [2023-12-02 15:55:06,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:55:06,795 INFO L495 AbstractCegarLoop]: Abstraction has 339 states and 387 transitions. [2023-12-02 15:55:06,796 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 98 states, 98 states have (on average 2.061224489795918) internal successors, (202), 97 states have internal predecessors, (202), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:55:06,796 INFO L276 IsEmpty]: Start isEmpty. Operand 339 states and 387 transitions. [2023-12-02 15:55:06,800 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 198 [2023-12-02 15:55:06,800 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:55:06,800 INFO L195 NwaCegarLoop]: trace histogram [95, 94, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 15:55:06,805 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_11c77a69-f6ac-4758-ba9a-9983e71b6557/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-12-02 15:55:07,000 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_11c77a69-f6ac-4758-ba9a-9983e71b6557/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:55:07,001 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:55:07,001 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:55:07,001 INFO L85 PathProgramCache]: Analyzing trace with hash -1441713735, now seen corresponding path program 6 times [2023-12-02 15:55:07,001 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:55:07,001 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [757609162] [2023-12-02 15:55:07,001 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:55:07,002 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:55:07,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:55:12,797 INFO L134 CoverageAnalysis]: Checked inductivity of 8930 backedges. 0 proven. 8930 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 15:55:12,797 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:55:12,797 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [757609162] [2023-12-02 15:55:12,797 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [757609162] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:55:12,797 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [893747947] [2023-12-02 15:55:12,797 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 15:55:12,797 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:55:12,797 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_11c77a69-f6ac-4758-ba9a-9983e71b6557/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:55:12,798 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_11c77a69-f6ac-4758-ba9a-9983e71b6557/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:55:12,799 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_11c77a69-f6ac-4758-ba9a-9983e71b6557/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-12-02 15:55:12,983 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 15:55:12,983 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 15:55:12,991 INFO L262 TraceCheckSpWp]: Trace formula consists of 788 conjuncts, 101 conjunts are in the unsatisfiable core [2023-12-02 15:55:13,002 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:55:13,306 INFO L134 CoverageAnalysis]: Checked inductivity of 8930 backedges. 0 proven. 8930 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 15:55:13,306 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 15:55:22,748 INFO L134 CoverageAnalysis]: Checked inductivity of 8930 backedges. 0 proven. 8930 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 15:55:22,748 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [893747947] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 15:55:22,749 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1728662266] [2023-12-02 15:55:22,750 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-12-02 15:55:22,751 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 15:55:22,751 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 15:55:22,751 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 15:55:22,751 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 15:55:22,829 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 15:55:23,363 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7717#(and (<= 200 |ULTIMATE.start_main_~i~0#1|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 99) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (exists ((|v_ULTIMATE.start_main_#t~nondet3#1_227| Int)) (and (or (= |v_ULTIMATE.start_main_#t~nondet3#1_227| 0) (< 999999 |ULTIMATE.start_main_~i~0#1|)) (<= 0 (+ |v_ULTIMATE.start_main_#t~nondet3#1_227| 2147483648)) (<= |v_ULTIMATE.start_main_#t~nondet3#1_227| 2147483647))))' at error location [2023-12-02 15:55:23,363 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 15:55:23,363 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 15:55:23,363 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [97, 97, 97] total 193 [2023-12-02 15:55:23,363 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [662393286] [2023-12-02 15:55:23,364 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 15:55:23,364 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 194 states [2023-12-02 15:55:23,364 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:55:23,371 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 194 interpolants. [2023-12-02 15:55:23,376 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18741, Invalid=21459, Unknown=0, NotChecked=0, Total=40200 [2023-12-02 15:55:23,377 INFO L87 Difference]: Start difference. First operand 339 states and 387 transitions. Second operand has 194 states, 194 states have (on average 2.0309278350515463) internal successors, (394), 193 states have internal predecessors, (394), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:55:49,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:55:49,481 INFO L93 Difference]: Finished difference Result 5666 states and 5952 transitions. [2023-12-02 15:55:49,481 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 288 states. [2023-12-02 15:55:49,482 INFO L78 Accepts]: Start accepts. Automaton has has 194 states, 194 states have (on average 2.0309278350515463) internal successors, (394), 193 states have internal predecessors, (394), 0 states have call successors, (0), 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 197 [2023-12-02 15:55:49,483 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:55:49,509 INFO L225 Difference]: With dead ends: 5666 [2023-12-02 15:55:49,509 INFO L226 Difference]: Without dead ends: 5472 [2023-12-02 15:55:49,519 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 782 GetRequests, 487 SyntacticMatches, 0 SemanticMatches, 295 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11689 ImplicationChecksByTransitivity, 18.9s TimeCoverageRelationStatistics Valid=28341, Invalid=59571, Unknown=0, NotChecked=0, Total=87912 [2023-12-02 15:55:49,520 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 2275 mSDsluCounter, 402 mSDsCounter, 0 mSdLazyCounter, 892 mSolverCounterSat, 1221 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2275 SdHoareTripleChecker+Valid, 406 SdHoareTripleChecker+Invalid, 2113 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1221 IncrementalHoareTripleChecker+Valid, 892 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2023-12-02 15:55:49,520 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2275 Valid, 406 Invalid, 2113 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1221 Valid, 892 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2023-12-02 15:55:49,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5472 states. [2023-12-02 15:55:49,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5472 to 675. [2023-12-02 15:55:49,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 675 states, 674 states have (on average 1.1439169139465875) internal successors, (771), 674 states have internal predecessors, (771), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:55:49,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 675 states to 675 states and 771 transitions. [2023-12-02 15:55:49,736 INFO L78 Accepts]: Start accepts. Automaton has 675 states and 771 transitions. Word has length 197 [2023-12-02 15:55:49,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:55:49,737 INFO L495 AbstractCegarLoop]: Abstraction has 675 states and 771 transitions. [2023-12-02 15:55:49,737 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 194 states, 194 states have (on average 2.0309278350515463) internal successors, (394), 193 states have internal predecessors, (394), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:55:49,737 INFO L276 IsEmpty]: Start isEmpty. Operand 675 states and 771 transitions. [2023-12-02 15:55:49,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 390 [2023-12-02 15:55:49,743 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:55:49,743 INFO L195 NwaCegarLoop]: trace histogram [191, 190, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 15:55:49,749 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_11c77a69-f6ac-4758-ba9a-9983e71b6557/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-12-02 15:55:49,944 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_11c77a69-f6ac-4758-ba9a-9983e71b6557/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:55:49,944 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:55:49,945 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:55:49,945 INFO L85 PathProgramCache]: Analyzing trace with hash -1755744295, now seen corresponding path program 7 times [2023-12-02 15:55:49,945 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:55:49,945 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2044927615] [2023-12-02 15:55:49,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:55:49,945 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:55:50,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:56:10,561 INFO L134 CoverageAnalysis]: Checked inductivity of 36290 backedges. 0 proven. 36290 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 15:56:10,561 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:56:10,561 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2044927615] [2023-12-02 15:56:10,561 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2044927615] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:56:10,561 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1813388716] [2023-12-02 15:56:10,561 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 15:56:10,562 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:56:10,562 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_11c77a69-f6ac-4758-ba9a-9983e71b6557/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:56:10,562 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_11c77a69-f6ac-4758-ba9a-9983e71b6557/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:56:10,563 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_11c77a69-f6ac-4758-ba9a-9983e71b6557/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-12-02 15:56:10,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:56:10,840 INFO L262 TraceCheckSpWp]: Trace formula consists of 1556 conjuncts, 192 conjunts are in the unsatisfiable core [2023-12-02 15:56:10,852 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:56:34,709 INFO L134 CoverageAnalysis]: Checked inductivity of 36290 backedges. 36290 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 15:56:34,709 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 15:56:34,709 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1813388716] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:56:34,709 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 15:56:34,709 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [193] imperfect sequences [193] total 385 [2023-12-02 15:56:34,710 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1815600318] [2023-12-02 15:56:34,710 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:56:34,711 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 193 states [2023-12-02 15:56:34,711 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:56:34,716 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 193 interpolants. [2023-12-02 15:56:34,727 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37057, Invalid=110783, Unknown=0, NotChecked=0, Total=147840 [2023-12-02 15:56:34,727 INFO L87 Difference]: Start difference. First operand 675 states and 771 transitions. Second operand has 193 states, 193 states have (on average 2.0155440414507773) internal successors, (389), 193 states have internal predecessors, (389), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:56:50,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:56:50,355 INFO L93 Difference]: Finished difference Result 27955 states and 28141 transitions. [2023-12-02 15:56:50,355 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 193 states. [2023-12-02 15:56:50,356 INFO L78 Accepts]: Start accepts. Automaton has has 193 states, 193 states have (on average 2.0155440414507773) internal successors, (389), 193 states have internal predecessors, (389), 0 states have call successors, (0), 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 389 [2023-12-02 15:56:50,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:56:50,361 INFO L225 Difference]: With dead ends: 27955 [2023-12-02 15:56:50,361 INFO L226 Difference]: Without dead ends: 1198 [2023-12-02 15:56:50,385 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 581 GetRequests, 198 SyntacticMatches, 0 SemanticMatches, 383 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36480 ImplicationChecksByTransitivity, 35.6s TimeCoverageRelationStatistics Valid=37057, Invalid=110783, Unknown=0, NotChecked=0, Total=147840 [2023-12-02 15:56:50,385 INFO L413 NwaCegarLoop]: 198 mSDtfsCounter, 712 mSDsluCounter, 914 mSDsCounter, 0 mSdLazyCounter, 995 mSolverCounterSat, 90 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 712 SdHoareTripleChecker+Valid, 1112 SdHoareTripleChecker+Invalid, 1085 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 90 IncrementalHoareTripleChecker+Valid, 995 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-12-02 15:56:50,386 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [712 Valid, 1112 Invalid, 1085 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [90 Valid, 995 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-12-02 15:56:50,387 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1198 states. [2023-12-02 15:56:50,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1198 to 1182. [2023-12-02 15:56:50,596 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1182 states, 1181 states have (on average 1.0076206604572395) internal successors, (1190), 1181 states have internal predecessors, (1190), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:56:50,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1182 states to 1182 states and 1190 transitions. [2023-12-02 15:56:50,599 INFO L78 Accepts]: Start accepts. Automaton has 1182 states and 1190 transitions. Word has length 389 [2023-12-02 15:56:50,599 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:56:50,599 INFO L495 AbstractCegarLoop]: Abstraction has 1182 states and 1190 transitions. [2023-12-02 15:56:50,599 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 193 states, 193 states have (on average 2.0155440414507773) internal successors, (389), 193 states have internal predecessors, (389), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:56:50,599 INFO L276 IsEmpty]: Start isEmpty. Operand 1182 states and 1190 transitions. [2023-12-02 15:56:50,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 390 [2023-12-02 15:56:50,605 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:56:50,605 INFO L195 NwaCegarLoop]: trace histogram [100, 99, 92, 91, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 15:56:50,611 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_11c77a69-f6ac-4758-ba9a-9983e71b6557/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2023-12-02 15:56:50,805 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_11c77a69-f6ac-4758-ba9a-9983e71b6557/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:56:50,806 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:56:50,806 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:56:50,806 INFO L85 PathProgramCache]: Analyzing trace with hash 559707623, now seen corresponding path program 1 times [2023-12-02 15:56:50,806 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:56:50,806 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [567275411] [2023-12-02 15:56:50,806 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:56:50,807 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:56:50,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:57:09,797 INFO L134 CoverageAnalysis]: Checked inductivity of 18272 backedges. 0 proven. 18272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 15:57:09,797 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:57:09,797 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [567275411] [2023-12-02 15:57:09,797 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [567275411] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:57:09,798 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1597987932] [2023-12-02 15:57:09,798 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:57:09,798 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:57:09,798 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_11c77a69-f6ac-4758-ba9a-9983e71b6557/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:57:09,799 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_11c77a69-f6ac-4758-ba9a-9983e71b6557/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:57:09,800 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_11c77a69-f6ac-4758-ba9a-9983e71b6557/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-12-02 15:57:10,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:57:10,039 INFO L262 TraceCheckSpWp]: Trace formula consists of 1374 conjuncts, 197 conjunts are in the unsatisfiable core [2023-12-02 15:57:10,051 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:57:10,559 INFO L134 CoverageAnalysis]: Checked inductivity of 18272 backedges. 0 proven. 18272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 15:57:10,559 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 15:57:23,564 INFO L134 CoverageAnalysis]: Checked inductivity of 18272 backedges. 0 proven. 18272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 15:57:23,565 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1597987932] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 15:57:23,565 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2061356936] [2023-12-02 15:57:23,567 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-12-02 15:57:23,567 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 15:57:23,567 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 15:57:23,567 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 15:57:23,567 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 15:57:23,650 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 15:57:24,639 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '64858#(and (<= 200 |ULTIMATE.start_main_~i~0#1|) (<= 1 |#StackHeapBarrier|) (exists ((|v_ULTIMATE.start_main_#t~nondet3#1_332| Int)) (and (<= |v_ULTIMATE.start_main_#t~nondet3#1_332| 2147483647) (or (= |v_ULTIMATE.start_main_#t~nondet3#1_332| 0) (< 999999 |ULTIMATE.start_main_~i~0#1|)) (<= 0 (+ |v_ULTIMATE.start_main_#t~nondet3#1_332| 2147483648)))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= |ULTIMATE.start_main_~j~0#1| 99) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 15:57:24,639 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 15:57:24,639 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 15:57:24,639 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [193, 193, 193] total 203 [2023-12-02 15:57:24,640 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [700458424] [2023-12-02 15:57:24,640 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 15:57:24,641 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 204 states [2023-12-02 15:57:24,641 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:57:24,644 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 204 interpolants. [2023-12-02 15:57:24,645 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20331, Invalid=23979, Unknown=0, NotChecked=0, Total=44310 [2023-12-02 15:57:24,646 INFO L87 Difference]: Start difference. First operand 1182 states and 1190 transitions. Second operand has 204 states, 204 states have (on average 2.1176470588235294) internal successors, (432), 203 states have internal predecessors, (432), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:57:35,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:57:35,589 INFO L93 Difference]: Finished difference Result 2333 states and 2468 transitions. [2023-12-02 15:57:35,589 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 211 states. [2023-12-02 15:57:35,589 INFO L78 Accepts]: Start accepts. Automaton has has 204 states, 204 states have (on average 2.1176470588235294) internal successors, (432), 203 states have internal predecessors, (432), 0 states have call successors, (0), 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 389 [2023-12-02 15:57:35,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:57:35,590 INFO L225 Difference]: With dead ends: 2333 [2023-12-02 15:57:35,590 INFO L226 Difference]: Without dead ends: 0 [2023-12-02 15:57:35,593 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1367 GetRequests, 966 SyntacticMatches, 183 SemanticMatches, 218 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20269 ImplicationChecksByTransitivity, 25.9s TimeCoverageRelationStatistics Valid=20457, Invalid=27723, Unknown=0, NotChecked=0, Total=48180 [2023-12-02 15:57:35,594 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 878 mSDsluCounter, 314 mSDsCounter, 0 mSdLazyCounter, 477 mSolverCounterSat, 690 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 878 SdHoareTripleChecker+Valid, 316 SdHoareTripleChecker+Invalid, 1167 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 690 IncrementalHoareTripleChecker+Valid, 477 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2023-12-02 15:57:35,594 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [878 Valid, 316 Invalid, 1167 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [690 Valid, 477 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-12-02 15:57:35,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2023-12-02 15:57:35,595 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2023-12-02 15:57:35,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:57:35,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2023-12-02 15:57:35,595 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 389 [2023-12-02 15:57:35,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:57:35,595 INFO L495 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2023-12-02 15:57:35,596 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 204 states, 204 states have (on average 2.1176470588235294) internal successors, (432), 203 states have internal predecessors, (432), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:57:35,596 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2023-12-02 15:57:35,596 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2023-12-02 15:57:35,599 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2023-12-02 15:57:35,605 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_11c77a69-f6ac-4758-ba9a-9983e71b6557/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-12-02 15:57:35,799 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_11c77a69-f6ac-4758-ba9a-9983e71b6557/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-12-02 15:57:35,801 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions.