./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/reducercommutativity/sep20-1.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version e7bb482b 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_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/config/TaipanReach.xml -i ../../sv-benchmarks/c/reducercommutativity/sep20-1.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 0b75ecb951567bcc8ce71aeb3e25d04f795cdcdda48b1113da4558d335596a9c --- Real Ultimate output --- This is Ultimate 0.2.3-dev-e7bb482 [2023-11-06 21:01:46,001 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-06 21:01:46,122 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-06 21:01:46,134 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-06 21:01:46,135 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-06 21:01:46,173 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-06 21:01:46,174 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-06 21:01:46,175 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-06 21:01:46,176 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-06 21:01:46,181 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-06 21:01:46,181 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-06 21:01:46,182 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-06 21:01:46,183 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-06 21:01:46,185 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-06 21:01:46,185 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-06 21:01:46,185 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-06 21:01:46,186 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-06 21:01:46,186 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-06 21:01:46,187 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-06 21:01:46,187 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-06 21:01:46,188 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-06 21:01:46,188 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-06 21:01:46,189 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-06 21:01:46,190 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-06 21:01:46,190 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-06 21:01:46,191 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-06 21:01:46,191 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-06 21:01:46,191 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-06 21:01:46,192 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-06 21:01:46,192 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-06 21:01:46,193 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-06 21:01:46,194 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-06 21:01:46,194 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-06 21:01:46,194 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-06 21:01:46,195 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-06 21:01:46,195 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-06 21:01:46,195 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-06 21:01:46,195 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-06 21:01:46,196 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-06 21:01:46,196 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-11-06 21:01:46,196 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-06 21:01:46,196 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-06 21:01:46,197 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-06 21:01:46,197 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-06 21:01:46,197 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-06 21:01:46,198 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_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 0b75ecb951567bcc8ce71aeb3e25d04f795cdcdda48b1113da4558d335596a9c [2023-11-06 21:01:46,501 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-06 21:01:46,535 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-06 21:01:46,538 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-06 21:01:46,539 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-06 21:01:46,540 INFO L274 PluginConnector]: CDTParser initialized [2023-11-06 21:01:46,542 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/../../sv-benchmarks/c/reducercommutativity/sep20-1.i [2023-11-06 21:01:49,769 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-06 21:01:49,975 INFO L384 CDTParser]: Found 1 translation units. [2023-11-06 21:01:49,976 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/sv-benchmarks/c/reducercommutativity/sep20-1.i [2023-11-06 21:01:49,984 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/data/8460bbe8c/6ed9ff098a1e44aa9d134c2c58b1efd5/FLAG20b1d2c5c [2023-11-06 21:01:49,999 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/data/8460bbe8c/6ed9ff098a1e44aa9d134c2c58b1efd5 [2023-11-06 21:01:50,002 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-06 21:01:50,003 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-06 21:01:50,005 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-06 21:01:50,005 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-06 21:01:50,011 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-06 21:01:50,011 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 09:01:50" (1/1) ... [2023-11-06 21:01:50,013 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@575c0adb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:01:50, skipping insertion in model container [2023-11-06 21:01:50,013 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 09:01:50" (1/1) ... [2023-11-06 21:01:50,036 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-06 21:01:50,266 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_6152837b-61a1-476a-8f6c-1848d2be2848/sv-benchmarks/c/reducercommutativity/sep20-1.i[1293,1306] [2023-11-06 21:01:50,273 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-06 21:01:50,284 INFO L202 MainTranslator]: Completed pre-run [2023-11-06 21:01:50,325 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_6152837b-61a1-476a-8f6c-1848d2be2848/sv-benchmarks/c/reducercommutativity/sep20-1.i[1293,1306] [2023-11-06 21:01:50,326 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-06 21:01:50,340 INFO L206 MainTranslator]: Completed translation [2023-11-06 21:01:50,341 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:01:50 WrapperNode [2023-11-06 21:01:50,341 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-06 21:01:50,342 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-06 21:01:50,342 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-06 21:01:50,342 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-06 21:01:50,350 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:01:50" (1/1) ... [2023-11-06 21:01:50,367 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:01:50" (1/1) ... [2023-11-06 21:01:50,393 INFO L138 Inliner]: procedures = 16, calls = 22, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 69 [2023-11-06 21:01:50,394 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-06 21:01:50,395 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-06 21:01:50,395 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-06 21:01:50,395 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-06 21:01:50,405 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:01:50" (1/1) ... [2023-11-06 21:01:50,405 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:01:50" (1/1) ... [2023-11-06 21:01:50,411 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:01:50" (1/1) ... [2023-11-06 21:01:50,411 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:01:50" (1/1) ... [2023-11-06 21:01:50,428 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:01:50" (1/1) ... [2023-11-06 21:01:50,433 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:01:50" (1/1) ... [2023-11-06 21:01:50,439 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:01:50" (1/1) ... [2023-11-06 21:01:50,445 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:01:50" (1/1) ... [2023-11-06 21:01:50,447 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-06 21:01:50,450 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-06 21:01:50,450 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-06 21:01:50,450 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-06 21:01:50,451 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:01:50" (1/1) ... [2023-11-06 21:01:50,458 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-06 21:01:50,469 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 21:01:50,483 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-06 21:01:50,515 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-06 21:01:50,530 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-06 21:01:50,530 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-06 21:01:50,530 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-06 21:01:50,531 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-06 21:01:50,531 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-06 21:01:50,531 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-06 21:01:50,533 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-06 21:01:50,533 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-06 21:01:50,534 INFO L130 BoogieDeclarations]: Found specification of procedure sep [2023-11-06 21:01:50,534 INFO L138 BoogieDeclarations]: Found implementation of procedure sep [2023-11-06 21:01:50,625 INFO L236 CfgBuilder]: Building ICFG [2023-11-06 21:01:50,627 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-06 21:01:50,836 INFO L277 CfgBuilder]: Performing block encoding [2023-11-06 21:01:50,898 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-06 21:01:50,898 INFO L302 CfgBuilder]: Removed 3 assume(true) statements. [2023-11-06 21:01:50,901 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 09:01:50 BoogieIcfgContainer [2023-11-06 21:01:50,901 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-06 21:01:50,904 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-06 21:01:50,904 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-06 21:01:50,907 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-06 21:01:50,908 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 09:01:50" (1/3) ... [2023-11-06 21:01:50,908 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@181d7f2b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 09:01:50, skipping insertion in model container [2023-11-06 21:01:50,909 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:01:50" (2/3) ... [2023-11-06 21:01:50,909 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@181d7f2b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 09:01:50, skipping insertion in model container [2023-11-06 21:01:50,909 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 09:01:50" (3/3) ... [2023-11-06 21:01:50,911 INFO L112 eAbstractionObserver]: Analyzing ICFG sep20-1.i [2023-11-06 21:01:50,932 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-06 21:01:50,932 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-06 21:01:51,003 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-06 21:01:51,014 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=LoopsAndPotentialCycles, 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;@19160b7d, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-06 21:01:51,015 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-06 21:01:51,019 INFO L276 IsEmpty]: Start isEmpty. Operand has 17 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-06 21:01:51,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-11-06 21:01:51,026 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:01:51,027 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 21:01:51,027 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 21:01:51,031 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:01:51,032 INFO L85 PathProgramCache]: Analyzing trace with hash -1081910660, now seen corresponding path program 1 times [2023-11-06 21:01:51,065 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:01:51,065 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [84151565] [2023-11-06 21:01:51,066 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:01:51,070 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:01:51,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:01:51,394 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-11-06 21:01:51,394 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:01:51,394 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [84151565] [2023-11-06 21:01:51,395 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [84151565] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 21:01:51,395 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 21:01:51,395 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-06 21:01:51,397 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [970587728] [2023-11-06 21:01:51,398 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 21:01:51,402 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-06 21:01:51,403 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:01:51,429 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-06 21:01:51,429 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-06 21:01:51,431 INFO L87 Difference]: Start difference. First operand has 17 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 1 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2023-11-06 21:01:51,474 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:01:51,475 INFO L93 Difference]: Finished difference Result 33 states and 43 transitions. [2023-11-06 21:01:51,476 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-06 21:01:51,477 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 1 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 20 [2023-11-06 21:01:51,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:01:51,483 INFO L225 Difference]: With dead ends: 33 [2023-11-06 21:01:51,483 INFO L226 Difference]: Without dead ends: 16 [2023-11-06 21:01:51,485 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-06 21:01:51,489 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 0 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-06 21:01:51,490 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 26 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-06 21:01:51,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2023-11-06 21:01:51,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2023-11-06 21:01:51,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 11 states have internal predecessors, (14), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-06 21:01:51,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 20 transitions. [2023-11-06 21:01:51,523 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 20 transitions. Word has length 20 [2023-11-06 21:01:51,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:01:51,523 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 20 transitions. [2023-11-06 21:01:51,523 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 1 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2023-11-06 21:01:51,523 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 20 transitions. [2023-11-06 21:01:51,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-11-06 21:01:51,525 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:01:51,525 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 21:01:51,525 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-06 21:01:51,526 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 21:01:51,526 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:01:51,527 INFO L85 PathProgramCache]: Analyzing trace with hash 1706975052, now seen corresponding path program 1 times [2023-11-06 21:01:51,527 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:01:51,527 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1431933219] [2023-11-06 21:01:51,527 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:01:51,527 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:01:51,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:01:51,677 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-11-06 21:01:51,678 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:01:51,678 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1431933219] [2023-11-06 21:01:51,678 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1431933219] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 21:01:51,679 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [718118057] [2023-11-06 21:01:51,679 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:01:51,679 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:01:51,679 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 21:01:51,683 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 21:01:51,715 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-06 21:01:51,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:01:51,797 INFO L262 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-06 21:01:51,802 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 21:01:51,837 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-06 21:01:51,837 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-06 21:01:51,838 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [718118057] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 21:01:51,838 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-06 21:01:51,838 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 5 [2023-11-06 21:01:51,839 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [108033082] [2023-11-06 21:01:51,839 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 21:01:51,840 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-06 21:01:51,840 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:01:51,841 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-06 21:01:51,841 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-06 21:01:51,842 INFO L87 Difference]: Start difference. First operand 16 states and 20 transitions. Second operand has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-06 21:01:51,885 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:01:51,887 INFO L93 Difference]: Finished difference Result 29 states and 39 transitions. [2023-11-06 21:01:51,888 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-06 21:01:51,888 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 21 [2023-11-06 21:01:51,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:01:51,890 INFO L225 Difference]: With dead ends: 29 [2023-11-06 21:01:51,890 INFO L226 Difference]: Without dead ends: 17 [2023-11-06 21:01:51,891 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-06 21:01:51,893 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-06 21:01:51,895 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 23 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-06 21:01:51,899 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2023-11-06 21:01:51,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2023-11-06 21:01:51,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.25) internal successors, (15), 12 states have internal predecessors, (15), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-06 21:01:51,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 21 transitions. [2023-11-06 21:01:51,907 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 21 transitions. Word has length 21 [2023-11-06 21:01:51,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:01:51,908 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 21 transitions. [2023-11-06 21:01:51,908 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-06 21:01:51,909 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 21 transitions. [2023-11-06 21:01:51,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-11-06 21:01:51,910 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:01:51,910 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 21:01:51,925 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-06 21:01:52,116 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:01:52,116 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 21:01:52,117 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:01:52,117 INFO L85 PathProgramCache]: Analyzing trace with hash 2015697050, now seen corresponding path program 1 times [2023-11-06 21:01:52,118 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:01:52,118 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [256861933] [2023-11-06 21:01:52,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:01:52,118 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:01:52,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:01:52,315 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-11-06 21:01:52,316 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:01:52,316 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [256861933] [2023-11-06 21:01:52,316 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [256861933] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 21:01:52,317 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1682284611] [2023-11-06 21:01:52,317 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:01:52,317 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:01:52,317 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 21:01:52,324 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 21:01:52,357 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-06 21:01:52,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:01:52,452 INFO L262 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-06 21:01:52,454 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 21:01:52,477 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-06 21:01:52,477 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-06 21:01:52,477 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1682284611] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 21:01:52,477 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-06 21:01:52,478 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 5 [2023-11-06 21:01:52,478 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [634406047] [2023-11-06 21:01:52,478 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 21:01:52,479 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-06 21:01:52,479 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:01:52,481 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-06 21:01:52,481 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-06 21:01:52,482 INFO L87 Difference]: Start difference. First operand 17 states and 21 transitions. Second operand has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-06 21:01:52,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:01:52,509 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2023-11-06 21:01:52,509 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-06 21:01:52,510 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 24 [2023-11-06 21:01:52,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:01:52,511 INFO L225 Difference]: With dead ends: 27 [2023-11-06 21:01:52,512 INFO L226 Difference]: Without dead ends: 18 [2023-11-06 21:01:52,512 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-06 21:01:52,515 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-06 21:01:52,517 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 23 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-06 21:01:52,519 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2023-11-06 21:01:52,525 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2023-11-06 21:01:52,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 13 states have internal predecessors, (16), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-06 21:01:52,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 22 transitions. [2023-11-06 21:01:52,528 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 22 transitions. Word has length 24 [2023-11-06 21:01:52,529 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:01:52,529 INFO L495 AbstractCegarLoop]: Abstraction has 18 states and 22 transitions. [2023-11-06 21:01:52,529 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-06 21:01:52,530 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 22 transitions. [2023-11-06 21:01:52,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-11-06 21:01:52,531 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:01:52,531 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 21:01:52,542 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-06 21:01:52,737 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:01:52,738 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 21:01:52,738 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:01:52,738 INFO L85 PathProgramCache]: Analyzing trace with hash -167844906, now seen corresponding path program 1 times [2023-11-06 21:01:52,738 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:01:52,739 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [856824506] [2023-11-06 21:01:52,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:01:52,739 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:01:52,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:01:52,923 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-11-06 21:01:52,924 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:01:52,924 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [856824506] [2023-11-06 21:01:52,924 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [856824506] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 21:01:52,924 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1163575861] [2023-11-06 21:01:52,925 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:01:52,925 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:01:52,925 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 21:01:52,928 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 21:01:52,936 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-06 21:01:53,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:01:53,026 INFO L262 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-06 21:01:53,029 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 21:01:53,074 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-11-06 21:01:53,076 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 21:01:53,133 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-11-06 21:01:53,133 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1163575861] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 21:01:53,133 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1003428211] [2023-11-06 21:01:53,161 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-06 21:01:53,162 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 21:01:53,166 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 21:01:53,171 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 21:01:53,172 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 21:01:54,006 INFO L197 IcfgInterpreter]: Interpreting procedure sep with input of size 10 for LOIs [2023-11-06 21:01:54,094 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 21:01:54,494 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '524#(and (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~ret2~0#1| 2147483647) (or (not (= |ULTIMATE.start_main_~ret2~0#1| |ULTIMATE.start_main_~ret~1#1|)) (not (= |ULTIMATE.start_main_~ret5~0#1| |ULTIMATE.start_main_~ret~1#1|))) (<= 0 (+ |ULTIMATE.start_main_~ret~1#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_main_~ret5~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret~1#1| 2147483647) (<= 2 |ULTIMATE.start_main_~#x~0#1.base|) (= |ULTIMATE.start_main_~#x~0#1.offset| 0) (<= 0 (+ |ULTIMATE.start_main_~ret2~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret5~0#1| 2147483647))' at error location [2023-11-06 21:01:54,494 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 21:01:54,494 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 21:01:54,495 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 3, 4] total 7 [2023-11-06 21:01:54,495 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1279210895] [2023-11-06 21:01:54,495 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 21:01:54,495 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-06 21:01:54,496 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:01:54,496 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-06 21:01:54,497 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=235, Unknown=9, NotChecked=0, Total=306 [2023-11-06 21:01:54,497 INFO L87 Difference]: Start difference. First operand 18 states and 22 transitions. Second operand has 7 states, 7 states have (on average 3.0) internal successors, (21), 7 states have internal predecessors, (21), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2023-11-06 21:01:54,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:01:54,536 INFO L93 Difference]: Finished difference Result 36 states and 46 transitions. [2023-11-06 21:01:54,537 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-06 21:01:54,537 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 7 states have internal predecessors, (21), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) Word has length 25 [2023-11-06 21:01:54,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:01:54,538 INFO L225 Difference]: With dead ends: 36 [2023-11-06 21:01:54,539 INFO L226 Difference]: Without dead ends: 21 [2023-11-06 21:01:54,540 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=62, Invalid=235, Unknown=9, NotChecked=0, Total=306 [2023-11-06 21:01:54,543 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-06 21:01:54,548 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 36 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-06 21:01:54,550 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2023-11-06 21:01:54,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2023-11-06 21:01:54,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 16 states have (on average 1.1875) internal successors, (19), 16 states have internal predecessors, (19), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-06 21:01:54,559 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2023-11-06 21:01:54,559 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 25 [2023-11-06 21:01:54,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:01:54,560 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2023-11-06 21:01:54,560 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 7 states have internal predecessors, (21), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2023-11-06 21:01:54,560 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2023-11-06 21:01:54,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-11-06 21:01:54,562 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:01:54,562 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 21:01:54,573 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-06 21:01:54,768 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:01:54,768 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 21:01:54,768 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:01:54,768 INFO L85 PathProgramCache]: Analyzing trace with hash 1912306438, now seen corresponding path program 2 times [2023-11-06 21:01:54,769 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:01:54,769 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [214159219] [2023-11-06 21:01:54,769 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:01:54,769 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:01:54,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:01:54,904 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-11-06 21:01:54,904 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:01:54,905 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [214159219] [2023-11-06 21:01:54,905 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [214159219] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 21:01:54,905 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [756226906] [2023-11-06 21:01:54,905 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-06 21:01:54,906 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:01:54,906 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 21:01:54,907 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 21:01:54,917 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-06 21:01:54,999 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-06 21:01:55,021 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-06 21:01:55,022 INFO L262 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-06 21:01:55,024 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 21:01:55,037 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-11-06 21:01:55,037 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 21:01:55,075 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-11-06 21:01:55,075 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [756226906] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 21:01:55,076 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1861054238] [2023-11-06 21:01:55,079 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-06 21:01:55,080 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 21:01:55,080 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 21:01:55,081 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 21:01:55,081 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 21:01:55,504 INFO L197 IcfgInterpreter]: Interpreting procedure sep with input of size 10 for LOIs [2023-11-06 21:01:55,565 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 21:01:55,937 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '795#(and (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~ret2~0#1| 2147483647) (or (not (= |ULTIMATE.start_main_~ret2~0#1| |ULTIMATE.start_main_~ret~1#1|)) (not (= |ULTIMATE.start_main_~ret5~0#1| |ULTIMATE.start_main_~ret~1#1|))) (<= 0 (+ |ULTIMATE.start_main_~ret~1#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_main_~ret5~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret~1#1| 2147483647) (<= 2 |ULTIMATE.start_main_~#x~0#1.base|) (= |ULTIMATE.start_main_~#x~0#1.offset| 0) (<= 0 (+ |ULTIMATE.start_main_~ret2~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret5~0#1| 2147483647))' at error location [2023-11-06 21:01:55,937 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 21:01:55,937 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 21:01:55,937 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2023-11-06 21:01:55,937 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [942727263] [2023-11-06 21:01:55,938 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 21:01:55,938 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-06 21:01:55,938 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:01:55,939 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-06 21:01:55,939 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=235, Unknown=9, NotChecked=0, Total=306 [2023-11-06 21:01:55,940 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 7 states have internal predecessors, (25), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2023-11-06 21:01:55,981 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:01:55,981 INFO L93 Difference]: Finished difference Result 38 states and 50 transitions. [2023-11-06 21:01:55,982 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-06 21:01:55,982 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 7 states have internal predecessors, (25), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 28 [2023-11-06 21:01:55,982 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:01:55,983 INFO L225 Difference]: With dead ends: 38 [2023-11-06 21:01:55,983 INFO L226 Difference]: Without dead ends: 24 [2023-11-06 21:01:55,984 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=62, Invalid=235, Unknown=9, NotChecked=0, Total=306 [2023-11-06 21:01:55,984 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-06 21:01:55,985 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 34 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-06 21:01:55,986 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2023-11-06 21:01:55,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2023-11-06 21:01:55,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 19 states have internal predecessors, (22), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-06 21:01:55,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 28 transitions. [2023-11-06 21:01:55,991 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 28 transitions. Word has length 28 [2023-11-06 21:01:55,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:01:55,991 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 28 transitions. [2023-11-06 21:01:55,992 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 7 states have internal predecessors, (25), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2023-11-06 21:01:55,992 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 28 transitions. [2023-11-06 21:01:55,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2023-11-06 21:01:55,993 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:01:55,994 INFO L195 NwaCegarLoop]: trace histogram [12, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 21:01:56,003 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-06 21:01:56,203 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:01:56,203 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 21:01:56,204 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:01:56,204 INFO L85 PathProgramCache]: Analyzing trace with hash -801027180, now seen corresponding path program 3 times [2023-11-06 21:01:56,204 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:01:56,204 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1875692198] [2023-11-06 21:01:56,204 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:01:56,205 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:01:56,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:01:56,398 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2023-11-06 21:01:56,398 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:01:56,399 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1875692198] [2023-11-06 21:01:56,399 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1875692198] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 21:01:56,399 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [41039690] [2023-11-06 21:01:56,399 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-06 21:01:56,400 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:01:56,400 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 21:01:56,401 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 21:01:56,424 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-06 21:01:56,524 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-06 21:01:56,525 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-06 21:01:56,527 INFO L262 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-06 21:01:56,531 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 21:01:56,583 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2023-11-06 21:01:56,583 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 21:01:56,667 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2023-11-06 21:01:56,667 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [41039690] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 21:01:56,668 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [652613517] [2023-11-06 21:01:56,671 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-06 21:01:56,671 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 21:01:56,672 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 21:01:56,673 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 21:01:56,673 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 21:01:57,040 INFO L197 IcfgInterpreter]: Interpreting procedure sep with input of size 10 for LOIs [2023-11-06 21:01:57,093 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 21:01:57,497 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1137#(and (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~ret2~0#1| 2147483647) (or (not (= |ULTIMATE.start_main_~ret2~0#1| |ULTIMATE.start_main_~ret~1#1|)) (not (= |ULTIMATE.start_main_~ret5~0#1| |ULTIMATE.start_main_~ret~1#1|))) (<= 0 (+ |ULTIMATE.start_main_~ret~1#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_main_~ret5~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret~1#1| 2147483647) (<= 2 |ULTIMATE.start_main_~#x~0#1.base|) (= |ULTIMATE.start_main_~#x~0#1.offset| 0) (<= 0 (+ |ULTIMATE.start_main_~ret2~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret5~0#1| 2147483647))' at error location [2023-11-06 21:01:57,497 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 21:01:57,497 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 21:01:57,498 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 6, 7] total 14 [2023-11-06 21:01:57,498 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [790607797] [2023-11-06 21:01:57,498 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 21:01:57,499 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-11-06 21:01:57,499 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:01:57,500 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-11-06 21:01:57,500 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=479, Unknown=9, NotChecked=0, Total=600 [2023-11-06 21:01:57,500 INFO L87 Difference]: Start difference. First operand 24 states and 28 transitions. Second operand has 14 states, 14 states have (on average 2.2857142857142856) internal successors, (32), 14 states have internal predecessors, (32), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-11-06 21:01:57,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:01:57,572 INFO L93 Difference]: Finished difference Result 49 states and 63 transitions. [2023-11-06 21:01:57,573 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-11-06 21:01:57,573 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.2857142857142856) internal successors, (32), 14 states have internal predecessors, (32), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 37 [2023-11-06 21:01:57,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:01:57,574 INFO L225 Difference]: With dead ends: 49 [2023-11-06 21:01:57,574 INFO L226 Difference]: Without dead ends: 31 [2023-11-06 21:01:57,575 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 177 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=112, Invalid=479, Unknown=9, NotChecked=0, Total=600 [2023-11-06 21:01:57,578 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-06 21:01:57,578 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 70 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-06 21:01:57,580 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2023-11-06 21:01:57,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2023-11-06 21:01:57,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 26 states have (on average 1.1153846153846154) internal successors, (29), 26 states have internal predecessors, (29), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-06 21:01:57,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2023-11-06 21:01:57,590 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 37 [2023-11-06 21:01:57,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:01:57,590 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2023-11-06 21:01:57,591 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.2857142857142856) internal successors, (32), 14 states have internal predecessors, (32), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-11-06 21:01:57,591 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2023-11-06 21:01:57,593 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2023-11-06 21:01:57,593 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:01:57,594 INFO L195 NwaCegarLoop]: trace histogram [12, 10, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 21:01:57,605 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-06 21:01:57,805 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:01:57,806 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 21:01:57,806 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:01:57,806 INFO L85 PathProgramCache]: Analyzing trace with hash -590704388, now seen corresponding path program 4 times [2023-11-06 21:01:57,806 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:01:57,808 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1713586966] [2023-11-06 21:01:57,809 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:01:57,809 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:01:57,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:01:58,257 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 114 trivial. 0 not checked. [2023-11-06 21:01:58,257 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:01:58,257 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1713586966] [2023-11-06 21:01:58,257 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1713586966] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 21:01:58,257 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1899365964] [2023-11-06 21:01:58,258 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-06 21:01:58,258 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:01:58,258 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 21:01:58,259 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 21:01:58,287 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-06 21:01:58,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:01:58,402 INFO L262 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 12 conjunts are in the unsatisfiable core [2023-11-06 21:01:58,405 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 21:01:58,453 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 114 trivial. 0 not checked. [2023-11-06 21:01:58,453 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 21:01:58,691 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 114 trivial. 0 not checked. [2023-11-06 21:01:58,692 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1899365964] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 21:01:58,692 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [145861278] [2023-11-06 21:01:58,695 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-06 21:01:58,695 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 21:01:58,695 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 21:01:58,696 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 21:01:58,696 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 21:01:59,015 INFO L197 IcfgInterpreter]: Interpreting procedure sep with input of size 10 for LOIs [2023-11-06 21:01:59,068 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 21:01:59,455 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1566#(and (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~ret2~0#1| 2147483647) (or (not (= |ULTIMATE.start_main_~ret2~0#1| |ULTIMATE.start_main_~ret~1#1|)) (not (= |ULTIMATE.start_main_~ret5~0#1| |ULTIMATE.start_main_~ret~1#1|))) (<= 0 (+ |ULTIMATE.start_main_~ret~1#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_main_~ret5~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret~1#1| 2147483647) (<= 2 |ULTIMATE.start_main_~#x~0#1.base|) (= |ULTIMATE.start_main_~#x~0#1.offset| 0) (<= 0 (+ |ULTIMATE.start_main_~ret2~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret5~0#1| 2147483647))' at error location [2023-11-06 21:01:59,456 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 21:01:59,456 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 21:01:59,456 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 13] total 23 [2023-11-06 21:01:59,456 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [348530334] [2023-11-06 21:01:59,456 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 21:01:59,457 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2023-11-06 21:01:59,457 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:01:59,458 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2023-11-06 21:01:59,458 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=294, Invalid=819, Unknown=9, NotChecked=0, Total=1122 [2023-11-06 21:01:59,459 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand has 23 states, 23 states have (on average 1.6521739130434783) internal successors, (38), 23 states have internal predecessors, (38), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2023-11-06 21:01:59,523 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:01:59,523 INFO L93 Difference]: Finished difference Result 60 states and 77 transitions. [2023-11-06 21:01:59,524 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2023-11-06 21:01:59,526 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.6521739130434783) internal successors, (38), 23 states have internal predecessors, (38), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) Word has length 44 [2023-11-06 21:01:59,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:01:59,529 INFO L225 Difference]: With dead ends: 60 [2023-11-06 21:01:59,529 INFO L226 Difference]: Without dead ends: 41 [2023-11-06 21:01:59,530 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 109 SyntacticMatches, 2 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 391 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=294, Invalid=819, Unknown=9, NotChecked=0, Total=1122 [2023-11-06 21:01:59,531 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-06 21:01:59,532 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 36 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-06 21:01:59,532 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2023-11-06 21:01:59,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2023-11-06 21:01:59,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 36 states have (on average 1.0833333333333333) internal successors, (39), 36 states have internal predecessors, (39), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-06 21:01:59,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2023-11-06 21:01:59,546 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 44 [2023-11-06 21:01:59,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:01:59,546 INFO L495 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2023-11-06 21:01:59,547 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.6521739130434783) internal successors, (38), 23 states have internal predecessors, (38), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2023-11-06 21:01:59,547 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2023-11-06 21:01:59,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2023-11-06 21:01:59,550 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:01:59,550 INFO L195 NwaCegarLoop]: trace histogram [20, 12, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 21:01:59,561 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-06 21:01:59,766 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:01:59,767 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 21:01:59,767 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:01:59,768 INFO L85 PathProgramCache]: Analyzing trace with hash 1662423804, now seen corresponding path program 5 times [2023-11-06 21:01:59,768 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:01:59,768 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1496667444] [2023-11-06 21:01:59,769 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:01:59,769 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:01:59,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:02:00,132 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 62 refuted. 0 times theorem prover too weak. 262 trivial. 0 not checked. [2023-11-06 21:02:00,133 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:02:00,133 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1496667444] [2023-11-06 21:02:00,133 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1496667444] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 21:02:00,133 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1530878395] [2023-11-06 21:02:00,133 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-06 21:02:00,134 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:02:00,134 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 21:02:00,140 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 21:02:00,187 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-06 21:02:00,301 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-06 21:02:00,301 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-06 21:02:00,302 INFO L262 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-06 21:02:00,306 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 21:02:00,335 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 54 proven. 3 refuted. 0 times theorem prover too weak. 267 trivial. 0 not checked. [2023-11-06 21:02:00,335 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 21:02:00,380 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 321 trivial. 0 not checked. [2023-11-06 21:02:00,380 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1530878395] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 21:02:00,380 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1552642066] [2023-11-06 21:02:00,383 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-06 21:02:00,383 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 21:02:00,384 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 21:02:00,384 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 21:02:00,384 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 21:02:00,675 INFO L197 IcfgInterpreter]: Interpreting procedure sep with input of size 10 for LOIs [2023-11-06 21:02:00,717 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 21:02:01,076 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2087#(and (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~ret2~0#1| 2147483647) (or (not (= |ULTIMATE.start_main_~ret2~0#1| |ULTIMATE.start_main_~ret~1#1|)) (not (= |ULTIMATE.start_main_~ret5~0#1| |ULTIMATE.start_main_~ret~1#1|))) (<= 0 (+ |ULTIMATE.start_main_~ret~1#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_main_~ret5~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret~1#1| 2147483647) (<= 2 |ULTIMATE.start_main_~#x~0#1.base|) (= |ULTIMATE.start_main_~#x~0#1.offset| 0) (<= 0 (+ |ULTIMATE.start_main_~ret2~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret5~0#1| 2147483647))' at error location [2023-11-06 21:02:01,077 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 21:02:01,077 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 21:02:01,077 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5, 5] total 13 [2023-11-06 21:02:01,077 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1748228098] [2023-11-06 21:02:01,077 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 21:02:01,078 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-11-06 21:02:01,078 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:02:01,079 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-11-06 21:02:01,079 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=454, Unknown=9, NotChecked=0, Total=552 [2023-11-06 21:02:01,079 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand has 13 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 13 states have internal predecessors, (31), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2023-11-06 21:02:01,122 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:02:01,122 INFO L93 Difference]: Finished difference Result 64 states and 78 transitions. [2023-11-06 21:02:01,123 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-11-06 21:02:01,123 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 13 states have internal predecessors, (31), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 54 [2023-11-06 21:02:01,123 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:02:01,124 INFO L225 Difference]: With dead ends: 64 [2023-11-06 21:02:01,124 INFO L226 Difference]: Without dead ends: 46 [2023-11-06 21:02:01,125 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 145 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 158 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=89, Invalid=454, Unknown=9, NotChecked=0, Total=552 [2023-11-06 21:02:01,125 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-06 21:02:01,126 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 56 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-06 21:02:01,126 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2023-11-06 21:02:01,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2023-11-06 21:02:01,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 41 states have (on average 1.0731707317073171) internal successors, (44), 41 states have internal predecessors, (44), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-06 21:02:01,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2023-11-06 21:02:01,132 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 54 [2023-11-06 21:02:01,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:02:01,132 INFO L495 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2023-11-06 21:02:01,133 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 13 states have internal predecessors, (31), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2023-11-06 21:02:01,133 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2023-11-06 21:02:01,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2023-11-06 21:02:01,134 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:02:01,134 INFO L195 NwaCegarLoop]: trace histogram [20, 15, 6, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 21:02:01,145 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-06 21:02:01,345 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:02:01,346 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 21:02:01,346 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:02:01,346 INFO L85 PathProgramCache]: Analyzing trace with hash -616116630, now seen corresponding path program 6 times [2023-11-06 21:02:01,346 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:02:01,346 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [281743279] [2023-11-06 21:02:01,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:02:01,347 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:02:01,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:02:01,684 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 0 proven. 89 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2023-11-06 21:02:01,685 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:02:01,685 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [281743279] [2023-11-06 21:02:01,685 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [281743279] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 21:02:01,685 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [704124996] [2023-11-06 21:02:01,686 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-06 21:02:01,686 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:02:01,686 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 21:02:01,687 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 21:02:01,711 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-06 21:02:01,868 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-06 21:02:01,869 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-06 21:02:01,872 INFO L262 TraceCheckSpWp]: Trace formula consists of 402 conjuncts, 7 conjunts are in the unsatisfiable core [2023-11-06 21:02:01,874 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 21:02:01,893 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 74 proven. 15 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2023-11-06 21:02:01,894 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 21:02:02,023 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 0 proven. 89 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2023-11-06 21:02:02,023 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [704124996] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 21:02:02,024 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [940300225] [2023-11-06 21:02:02,028 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-06 21:02:02,029 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 21:02:02,029 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 21:02:02,029 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 21:02:02,029 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 21:02:02,329 INFO L197 IcfgInterpreter]: Interpreting procedure sep with input of size 10 for LOIs [2023-11-06 21:02:02,372 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 21:02:02,736 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2670#(and (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~ret2~0#1| 2147483647) (or (not (= |ULTIMATE.start_main_~ret2~0#1| |ULTIMATE.start_main_~ret~1#1|)) (not (= |ULTIMATE.start_main_~ret5~0#1| |ULTIMATE.start_main_~ret~1#1|))) (<= 0 (+ |ULTIMATE.start_main_~ret~1#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_main_~ret5~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret~1#1| 2147483647) (<= 2 |ULTIMATE.start_main_~#x~0#1.base|) (= |ULTIMATE.start_main_~#x~0#1.offset| 0) (<= 0 (+ |ULTIMATE.start_main_~ret2~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret5~0#1| 2147483647))' at error location [2023-11-06 21:02:02,736 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 21:02:02,736 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 21:02:02,737 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 15 [2023-11-06 21:02:02,737 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1868317246] [2023-11-06 21:02:02,737 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 21:02:02,737 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-11-06 21:02:02,738 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:02:02,738 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-11-06 21:02:02,739 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=495, Unknown=9, NotChecked=0, Total=650 [2023-11-06 21:02:02,739 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand has 15 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 15 states have internal predecessors, (32), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 1 states have call predecessors, (5), 2 states have call successors, (5) [2023-11-06 21:02:02,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:02:02,794 INFO L93 Difference]: Finished difference Result 76 states and 92 transitions. [2023-11-06 21:02:02,794 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-11-06 21:02:02,794 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 15 states have internal predecessors, (32), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 1 states have call predecessors, (5), 2 states have call successors, (5) Word has length 61 [2023-11-06 21:02:02,795 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:02:02,796 INFO L225 Difference]: With dead ends: 76 [2023-11-06 21:02:02,796 INFO L226 Difference]: Without dead ends: 53 [2023-11-06 21:02:02,797 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 165 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 231 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=146, Invalid=495, Unknown=9, NotChecked=0, Total=650 [2023-11-06 21:02:02,798 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-06 21:02:02,798 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 34 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-06 21:02:02,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2023-11-06 21:02:02,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2023-11-06 21:02:02,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 48 states have (on average 1.0625) internal successors, (51), 48 states have internal predecessors, (51), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-06 21:02:02,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 57 transitions. [2023-11-06 21:02:02,806 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 57 transitions. Word has length 61 [2023-11-06 21:02:02,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:02:02,806 INFO L495 AbstractCegarLoop]: Abstraction has 53 states and 57 transitions. [2023-11-06 21:02:02,807 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 15 states have internal predecessors, (32), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 1 states have call predecessors, (5), 2 states have call successors, (5) [2023-11-06 21:02:02,807 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 57 transitions. [2023-11-06 21:02:02,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2023-11-06 21:02:02,808 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:02:02,808 INFO L195 NwaCegarLoop]: trace histogram [36, 20, 6, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 21:02:02,821 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-06 21:02:03,021 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:02:03,021 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 21:02:03,021 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:02:03,021 INFO L85 PathProgramCache]: Analyzing trace with hash -1437778948, now seen corresponding path program 7 times [2023-11-06 21:02:03,022 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:02:03,022 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1674234455] [2023-11-06 21:02:03,022 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:02:03,022 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:02:03,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:02:03,939 INFO L134 CoverageAnalysis]: Checked inductivity of 978 backedges. 0 proven. 418 refuted. 0 times theorem prover too weak. 560 trivial. 0 not checked. [2023-11-06 21:02:03,939 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:02:03,940 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1674234455] [2023-11-06 21:02:03,940 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1674234455] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 21:02:03,940 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1422170207] [2023-11-06 21:02:03,940 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-06 21:02:03,941 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:02:03,941 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 21:02:03,942 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 21:02:03,975 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-06 21:02:04,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:02:04,191 INFO L262 TraceCheckSpWp]: Trace formula consists of 486 conjuncts, 14 conjunts are in the unsatisfiable core [2023-11-06 21:02:04,195 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 21:02:04,230 INFO L134 CoverageAnalysis]: Checked inductivity of 978 backedges. 340 proven. 78 refuted. 0 times theorem prover too weak. 560 trivial. 0 not checked. [2023-11-06 21:02:04,231 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 21:02:04,500 INFO L134 CoverageAnalysis]: Checked inductivity of 978 backedges. 0 proven. 418 refuted. 0 times theorem prover too weak. 560 trivial. 0 not checked. [2023-11-06 21:02:04,500 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1422170207] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 21:02:04,500 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1116162939] [2023-11-06 21:02:04,503 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-06 21:02:04,503 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 21:02:04,503 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 21:02:04,503 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 21:02:04,504 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 21:02:04,822 INFO L197 IcfgInterpreter]: Interpreting procedure sep with input of size 10 for LOIs [2023-11-06 21:02:04,868 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 21:02:05,320 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3425#(and (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~ret2~0#1| 2147483647) (or (not (= |ULTIMATE.start_main_~ret2~0#1| |ULTIMATE.start_main_~ret~1#1|)) (not (= |ULTIMATE.start_main_~ret5~0#1| |ULTIMATE.start_main_~ret~1#1|))) (<= 0 (+ |ULTIMATE.start_main_~ret~1#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_main_~ret5~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret~1#1| 2147483647) (<= 2 |ULTIMATE.start_main_~#x~0#1.base|) (= |ULTIMATE.start_main_~#x~0#1.offset| 0) (<= 0 (+ |ULTIMATE.start_main_~ret2~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret5~0#1| 2147483647))' at error location [2023-11-06 21:02:05,320 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 21:02:05,320 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 21:02:05,321 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 23 [2023-11-06 21:02:05,321 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1467011844] [2023-11-06 21:02:05,321 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 21:02:05,322 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2023-11-06 21:02:05,322 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:02:05,323 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2023-11-06 21:02:05,323 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=294, Invalid=819, Unknown=9, NotChecked=0, Total=1122 [2023-11-06 21:02:05,324 INFO L87 Difference]: Start difference. First operand 53 states and 57 transitions. Second operand has 23 states, 23 states have (on average 1.7826086956521738) internal successors, (41), 23 states have internal predecessors, (41), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 1 states have call predecessors, (5), 2 states have call successors, (5) [2023-11-06 21:02:05,384 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:02:05,384 INFO L93 Difference]: Finished difference Result 91 states and 108 transitions. [2023-11-06 21:02:05,385 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2023-11-06 21:02:05,385 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.7826086956521738) internal successors, (41), 23 states have internal predecessors, (41), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 1 states have call predecessors, (5), 2 states have call successors, (5) Word has length 82 [2023-11-06 21:02:05,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:02:05,386 INFO L225 Difference]: With dead ends: 91 [2023-11-06 21:02:05,386 INFO L226 Difference]: Without dead ends: 61 [2023-11-06 21:02:05,387 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 259 GetRequests, 221 SyntacticMatches, 6 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 415 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=294, Invalid=819, Unknown=9, NotChecked=0, Total=1122 [2023-11-06 21:02:05,388 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-06 21:02:05,388 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 45 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-06 21:02:05,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2023-11-06 21:02:05,394 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2023-11-06 21:02:05,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 56 states have (on average 1.0535714285714286) internal successors, (59), 56 states have internal predecessors, (59), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-06 21:02:05,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 65 transitions. [2023-11-06 21:02:05,395 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 65 transitions. Word has length 82 [2023-11-06 21:02:05,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:02:05,396 INFO L495 AbstractCegarLoop]: Abstraction has 61 states and 65 transitions. [2023-11-06 21:02:05,396 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.7826086956521738) internal successors, (41), 23 states have internal predecessors, (41), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 1 states have call predecessors, (5), 2 states have call successors, (5) [2023-11-06 21:02:05,396 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 65 transitions. [2023-11-06 21:02:05,397 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2023-11-06 21:02:05,397 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:02:05,397 INFO L195 NwaCegarLoop]: trace histogram [60, 20, 6, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 21:02:05,409 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-11-06 21:02:05,604 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-11-06 21:02:05,604 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 21:02:05,605 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:02:05,605 INFO L85 PathProgramCache]: Analyzing trace with hash -701743364, now seen corresponding path program 8 times [2023-11-06 21:02:05,605 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:02:05,605 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1136805923] [2023-11-06 21:02:05,605 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:02:05,605 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:02:05,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:02:06,280 INFO L134 CoverageAnalysis]: Checked inductivity of 2190 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 2169 trivial. 0 not checked. [2023-11-06 21:02:06,280 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:02:06,281 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1136805923] [2023-11-06 21:02:06,281 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1136805923] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 21:02:06,281 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1189766842] [2023-11-06 21:02:06,281 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-06 21:02:06,281 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:02:06,281 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 21:02:06,282 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 21:02:06,307 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-11-06 21:02:06,639 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2023-11-06 21:02:06,639 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-06 21:02:06,642 INFO L262 TraceCheckSpWp]: Trace formula consists of 259 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-06 21:02:06,645 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 21:02:06,666 INFO L134 CoverageAnalysis]: Checked inductivity of 2190 backedges. 886 proven. 21 refuted. 0 times theorem prover too weak. 1283 trivial. 0 not checked. [2023-11-06 21:02:06,666 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 21:02:06,767 INFO L134 CoverageAnalysis]: Checked inductivity of 2190 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 2169 trivial. 0 not checked. [2023-11-06 21:02:06,768 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1189766842] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 21:02:06,768 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [145316798] [2023-11-06 21:02:06,770 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-06 21:02:06,770 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 21:02:06,770 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 21:02:06,771 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 21:02:06,771 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 21:02:07,043 INFO L197 IcfgInterpreter]: Interpreting procedure sep with input of size 10 for LOIs [2023-11-06 21:02:07,084 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 21:02:07,418 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4364#(and (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~ret2~0#1| 2147483647) (or (not (= |ULTIMATE.start_main_~ret2~0#1| |ULTIMATE.start_main_~ret~1#1|)) (not (= |ULTIMATE.start_main_~ret5~0#1| |ULTIMATE.start_main_~ret~1#1|))) (<= 0 (+ |ULTIMATE.start_main_~ret~1#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_main_~ret5~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret~1#1| 2147483647) (<= 2 |ULTIMATE.start_main_~#x~0#1.base|) (= |ULTIMATE.start_main_~#x~0#1.offset| 0) (<= 0 (+ |ULTIMATE.start_main_~ret2~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret5~0#1| 2147483647))' at error location [2023-11-06 21:02:07,419 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 21:02:07,419 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 21:02:07,419 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 17 [2023-11-06 21:02:07,419 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1716240934] [2023-11-06 21:02:07,419 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 21:02:07,420 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-11-06 21:02:07,420 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:02:07,420 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-11-06 21:02:07,421 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=570, Unknown=9, NotChecked=0, Total=756 [2023-11-06 21:02:07,421 INFO L87 Difference]: Start difference. First operand 61 states and 65 transitions. Second operand has 17 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 17 states have internal predecessors, (31), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2023-11-06 21:02:07,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:02:07,480 INFO L93 Difference]: Finished difference Result 97 states and 109 transitions. [2023-11-06 21:02:07,482 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-11-06 21:02:07,482 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 17 states have internal predecessors, (31), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 106 [2023-11-06 21:02:07,483 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:02:07,483 INFO L225 Difference]: With dead ends: 97 [2023-11-06 21:02:07,484 INFO L226 Difference]: Without dead ends: 69 [2023-11-06 21:02:07,485 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 325 GetRequests, 299 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 268 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=177, Invalid=570, Unknown=9, NotChecked=0, Total=756 [2023-11-06 21:02:07,486 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-06 21:02:07,486 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 45 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-06 21:02:07,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2023-11-06 21:02:07,493 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2023-11-06 21:02:07,494 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 64 states have (on average 1.046875) internal successors, (67), 64 states have internal predecessors, (67), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-06 21:02:07,495 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 73 transitions. [2023-11-06 21:02:07,495 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 73 transitions. Word has length 106 [2023-11-06 21:02:07,495 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:02:07,496 INFO L495 AbstractCegarLoop]: Abstraction has 69 states and 73 transitions. [2023-11-06 21:02:07,496 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 17 states have internal predecessors, (31), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2023-11-06 21:02:07,496 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 73 transitions. [2023-11-06 21:02:07,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2023-11-06 21:02:07,498 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:02:07,498 INFO L195 NwaCegarLoop]: trace histogram [60, 20, 14, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 21:02:07,508 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-11-06 21:02:07,705 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2023-11-06 21:02:07,705 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 21:02:07,706 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:02:07,706 INFO L85 PathProgramCache]: Analyzing trace with hash -1204385028, now seen corresponding path program 9 times [2023-11-06 21:02:07,706 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:02:07,706 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [490857701] [2023-11-06 21:02:07,706 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:02:07,706 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:02:07,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:02:08,837 INFO L134 CoverageAnalysis]: Checked inductivity of 2274 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 2169 trivial. 0 not checked. [2023-11-06 21:02:08,837 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:02:08,837 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [490857701] [2023-11-06 21:02:08,837 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [490857701] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 21:02:08,837 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1585608042] [2023-11-06 21:02:08,837 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-06 21:02:08,837 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:02:08,838 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 21:02:08,839 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 21:02:08,895 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-11-06 21:02:09,163 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-06 21:02:09,164 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-06 21:02:09,170 INFO L262 TraceCheckSpWp]: Trace formula consists of 638 conjuncts, 16 conjunts are in the unsatisfiable core [2023-11-06 21:02:09,174 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 21:02:09,214 INFO L134 CoverageAnalysis]: Checked inductivity of 2274 backedges. 886 proven. 105 refuted. 0 times theorem prover too weak. 1283 trivial. 0 not checked. [2023-11-06 21:02:09,215 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 21:02:09,481 INFO L134 CoverageAnalysis]: Checked inductivity of 2274 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 2169 trivial. 0 not checked. [2023-11-06 21:02:09,482 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1585608042] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 21:02:09,482 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1941936566] [2023-11-06 21:02:09,485 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-06 21:02:09,485 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 21:02:09,486 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 21:02:09,486 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 21:02:09,487 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 21:02:09,787 INFO L197 IcfgInterpreter]: Interpreting procedure sep with input of size 10 for LOIs [2023-11-06 21:02:09,827 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 21:02:10,278 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5386#(and (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~ret2~0#1| 2147483647) (or (not (= |ULTIMATE.start_main_~ret2~0#1| |ULTIMATE.start_main_~ret~1#1|)) (not (= |ULTIMATE.start_main_~ret5~0#1| |ULTIMATE.start_main_~ret~1#1|))) (<= 0 (+ |ULTIMATE.start_main_~ret~1#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_main_~ret5~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret~1#1| 2147483647) (<= 2 |ULTIMATE.start_main_~#x~0#1.base|) (= |ULTIMATE.start_main_~#x~0#1.offset| 0) (<= 0 (+ |ULTIMATE.start_main_~ret2~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret5~0#1| 2147483647))' at error location [2023-11-06 21:02:10,278 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 21:02:10,278 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 21:02:10,278 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 22 [2023-11-06 21:02:10,279 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [283344132] [2023-11-06 21:02:10,279 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 21:02:10,279 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2023-11-06 21:02:10,280 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:02:10,280 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2023-11-06 21:02:10,281 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=272, Invalid=775, Unknown=9, NotChecked=0, Total=1056 [2023-11-06 21:02:10,281 INFO L87 Difference]: Start difference. First operand 69 states and 73 transitions. Second operand has 22 states, 22 states have (on average 1.6818181818181819) internal successors, (37), 22 states have internal predecessors, (37), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2023-11-06 21:02:10,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:02:10,338 INFO L93 Difference]: Finished difference Result 102 states and 111 transitions. [2023-11-06 21:02:10,339 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2023-11-06 21:02:10,339 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.6818181818181819) internal successors, (37), 22 states have internal predecessors, (37), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 114 [2023-11-06 21:02:10,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:02:10,341 INFO L225 Difference]: With dead ends: 102 [2023-11-06 21:02:10,341 INFO L226 Difference]: Without dead ends: 74 [2023-11-06 21:02:10,342 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 357 GetRequests, 315 SyntacticMatches, 11 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 421 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=272, Invalid=775, Unknown=9, NotChecked=0, Total=1056 [2023-11-06 21:02:10,342 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-06 21:02:10,343 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 45 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-06 21:02:10,345 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2023-11-06 21:02:10,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 74. [2023-11-06 21:02:10,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 69 states have (on average 1.0434782608695652) internal successors, (72), 69 states have internal predecessors, (72), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-06 21:02:10,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 78 transitions. [2023-11-06 21:02:10,357 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 78 transitions. Word has length 114 [2023-11-06 21:02:10,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:02:10,358 INFO L495 AbstractCegarLoop]: Abstraction has 74 states and 78 transitions. [2023-11-06 21:02:10,359 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.6818181818181819) internal successors, (37), 22 states have internal predecessors, (37), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2023-11-06 21:02:10,359 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 78 transitions. [2023-11-06 21:02:10,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2023-11-06 21:02:10,361 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:02:10,361 INFO L195 NwaCegarLoop]: trace histogram [60, 20, 19, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 21:02:10,375 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2023-11-06 21:02:10,569 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6152837b-61a1-476a-8f6c-1848d2be2848/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:02:10,569 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 21:02:10,571 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:02:10,571 INFO L85 PathProgramCache]: Analyzing trace with hash -785667436, now seen corresponding path program 10 times [2023-11-06 21:02:10,571 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:02:10,571 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [781776136] [2023-11-06 21:02:10,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:02:10,572 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms