./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/hard-ll_valuebound10.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 30e01a73 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_51723ed3-5288-40b1-b254-baae100add11/bin/utaipan-verify-mE87zJ7Ire/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51723ed3-5288-40b1-b254-baae100add11/bin/utaipan-verify-mE87zJ7Ire/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51723ed3-5288-40b1-b254-baae100add11/bin/utaipan-verify-mE87zJ7Ire/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51723ed3-5288-40b1-b254-baae100add11/bin/utaipan-verify-mE87zJ7Ire/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/hard-ll_valuebound10.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51723ed3-5288-40b1-b254-baae100add11/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51723ed3-5288-40b1-b254-baae100add11/bin/utaipan-verify-mE87zJ7Ire --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 6d5fb336862157190b75f459fa5ac35efb8ca70e207f909b082fde37cf98e7f7 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-30e01a7 [2023-11-23 21:21:47,317 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-23 21:21:47,452 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51723ed3-5288-40b1-b254-baae100add11/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-23 21:21:47,467 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-23 21:21:47,468 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-23 21:21:47,527 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-23 21:21:47,528 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-23 21:21:47,529 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-23 21:21:47,530 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-23 21:21:47,539 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-23 21:21:47,539 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-23 21:21:47,541 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-23 21:21:47,542 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-23 21:21:47,544 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-23 21:21:47,544 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-23 21:21:47,545 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-23 21:21:47,545 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-23 21:21:47,546 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-23 21:21:47,546 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-23 21:21:47,547 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-23 21:21:47,547 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-23 21:21:47,548 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-23 21:21:47,549 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-23 21:21:47,567 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-23 21:21:47,567 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-23 21:21:47,568 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-23 21:21:47,568 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-23 21:21:47,569 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-23 21:21:47,570 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-23 21:21:47,570 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-23 21:21:47,572 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-23 21:21:47,572 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-23 21:21:47,572 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-23 21:21:47,573 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-23 21:21:47,573 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-23 21:21:47,573 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-23 21:21:47,575 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-23 21:21:47,575 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:21:47,575 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-23 21:21:47,576 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-23 21:21:47,576 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-23 21:21:47,577 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-23 21:21:47,577 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-23 21:21:47,577 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-23 21:21:47,578 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-23 21:21:47,578 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-23 21:21:47,579 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-23 21:21:47,579 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_51723ed3-5288-40b1-b254-baae100add11/bin/utaipan-verify-mE87zJ7Ire/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51723ed3-5288-40b1-b254-baae100add11/bin/utaipan-verify-mE87zJ7Ire Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 6d5fb336862157190b75f459fa5ac35efb8ca70e207f909b082fde37cf98e7f7 [2023-11-23 21:21:47,914 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-23 21:21:47,941 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-23 21:21:47,944 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-23 21:21:47,946 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-23 21:21:47,946 INFO L274 PluginConnector]: CDTParser initialized [2023-11-23 21:21:47,948 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51723ed3-5288-40b1-b254-baae100add11/bin/utaipan-verify-mE87zJ7Ire/../../sv-benchmarks/c/nla-digbench-scaling/hard-ll_valuebound10.c [2023-11-23 21:21:51,164 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-23 21:21:51,436 INFO L384 CDTParser]: Found 1 translation units. [2023-11-23 21:21:51,437 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51723ed3-5288-40b1-b254-baae100add11/sv-benchmarks/c/nla-digbench-scaling/hard-ll_valuebound10.c [2023-11-23 21:21:51,452 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51723ed3-5288-40b1-b254-baae100add11/bin/utaipan-verify-mE87zJ7Ire/data/c7160a03e/de9a26ead6f0458d85d5bb10889eff5f/FLAG4ac34eab0 [2023-11-23 21:21:51,480 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51723ed3-5288-40b1-b254-baae100add11/bin/utaipan-verify-mE87zJ7Ire/data/c7160a03e/de9a26ead6f0458d85d5bb10889eff5f [2023-11-23 21:21:51,487 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-23 21:21:51,491 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-23 21:21:51,493 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-23 21:21:51,494 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-23 21:21:51,501 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-23 21:21:51,505 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:21:51" (1/1) ... [2023-11-23 21:21:51,506 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3003530d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:21:51, skipping insertion in model container [2023-11-23 21:21:51,507 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:21:51" (1/1) ... [2023-11-23 21:21:51,533 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-23 21:21:51,763 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_51723ed3-5288-40b1-b254-baae100add11/sv-benchmarks/c/nla-digbench-scaling/hard-ll_valuebound10.c[538,551] [2023-11-23 21:21:51,788 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:21:51,801 INFO L202 MainTranslator]: Completed pre-run [2023-11-23 21:21:51,814 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_51723ed3-5288-40b1-b254-baae100add11/sv-benchmarks/c/nla-digbench-scaling/hard-ll_valuebound10.c[538,551] [2023-11-23 21:21:51,826 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:21:51,842 INFO L206 MainTranslator]: Completed translation [2023-11-23 21:21:51,843 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:21:51 WrapperNode [2023-11-23 21:21:51,843 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-23 21:21:51,844 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-23 21:21:51,845 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-23 21:21:51,845 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-23 21:21:51,854 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:21:51" (1/1) ... [2023-11-23 21:21:51,862 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:21:51" (1/1) ... [2023-11-23 21:21:51,889 INFO L138 Inliner]: procedures = 14, calls = 17, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 56 [2023-11-23 21:21:51,890 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-23 21:21:51,891 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-23 21:21:51,891 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-23 21:21:51,891 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-23 21:21:51,912 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:21:51" (1/1) ... [2023-11-23 21:21:51,912 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:21:51" (1/1) ... [2023-11-23 21:21:51,914 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:21:51" (1/1) ... [2023-11-23 21:21:51,914 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:21:51" (1/1) ... [2023-11-23 21:21:51,929 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:21:51" (1/1) ... [2023-11-23 21:21:51,935 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:21:51" (1/1) ... [2023-11-23 21:21:51,936 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:21:51" (1/1) ... [2023-11-23 21:21:51,938 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:21:51" (1/1) ... [2023-11-23 21:21:51,940 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-23 21:21:51,941 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-23 21:21:51,941 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-23 21:21:51,942 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-23 21:21:51,943 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:21:51" (1/1) ... [2023-11-23 21:21:51,956 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:21:51,976 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51723ed3-5288-40b1-b254-baae100add11/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:21:51,994 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51723ed3-5288-40b1-b254-baae100add11/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-23 21:21:51,997 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51723ed3-5288-40b1-b254-baae100add11/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-23 21:21:52,044 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-23 21:21:52,044 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-11-23 21:21:52,045 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-11-23 21:21:52,045 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-23 21:21:52,045 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-23 21:21:52,045 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-23 21:21:52,046 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-11-23 21:21:52,046 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-11-23 21:21:52,124 INFO L241 CfgBuilder]: Building ICFG [2023-11-23 21:21:52,126 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-23 21:21:52,315 INFO L282 CfgBuilder]: Performing block encoding [2023-11-23 21:21:52,363 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-23 21:21:52,363 INFO L309 CfgBuilder]: Removed 2 assume(true) statements. [2023-11-23 21:21:52,365 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:21:52 BoogieIcfgContainer [2023-11-23 21:21:52,365 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-23 21:21:52,369 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-23 21:21:52,369 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-23 21:21:52,373 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-23 21:21:52,373 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 09:21:51" (1/3) ... [2023-11-23 21:21:52,374 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2b932879 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:21:52, skipping insertion in model container [2023-11-23 21:21:52,374 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:21:51" (2/3) ... [2023-11-23 21:21:52,375 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2b932879 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:21:52, skipping insertion in model container [2023-11-23 21:21:52,375 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:21:52" (3/3) ... [2023-11-23 21:21:52,376 INFO L112 eAbstractionObserver]: Analyzing ICFG hard-ll_valuebound10.c [2023-11-23 21:21:52,400 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-23 21:21:52,401 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-23 21:21:52,451 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-23 21:21:52,459 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopHeads, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@697dc7d5, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-23 21:21:52,460 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-23 21:21:52,465 INFO L276 IsEmpty]: Start isEmpty. Operand has 27 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 14 states have internal predecessors, (19), 10 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2023-11-23 21:21:52,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-11-23 21:21:52,473 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:21:52,474 INFO L195 NwaCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:21:52,474 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:21:52,480 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:21:52,480 INFO L85 PathProgramCache]: Analyzing trace with hash 763440750, now seen corresponding path program 1 times [2023-11-23 21:21:52,488 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:21:52,489 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1713338705] [2023-11-23 21:21:52,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:21:52,489 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:21:52,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:21:52,977 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-23 21:21:52,977 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:21:52,978 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1713338705] [2023-11-23 21:21:52,979 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1713338705] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:21:52,979 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:21:52,980 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-23 21:21:52,982 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1946954638] [2023-11-23 21:21:52,983 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:21:52,989 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-23 21:21:52,989 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:21:53,028 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-23 21:21:53,030 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-23 21:21:53,033 INFO L87 Difference]: Start difference. First operand has 27 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 14 states have internal predecessors, (19), 10 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) Second operand has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2023-11-23 21:21:53,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:21:53,231 INFO L93 Difference]: Finished difference Result 57 states and 96 transitions. [2023-11-23 21:21:53,233 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-23 21:21:53,235 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 17 [2023-11-23 21:21:53,237 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:21:53,270 INFO L225 Difference]: With dead ends: 57 [2023-11-23 21:21:53,271 INFO L226 Difference]: Without dead ends: 35 [2023-11-23 21:21:53,275 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:21:53,281 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 10 mSDsluCounter, 73 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 102 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:21:53,282 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 102 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:21:53,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2023-11-23 21:21:53,362 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 29. [2023-11-23 21:21:53,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 15 states have (on average 1.2) internal successors, (18), 16 states have internal predecessors, (18), 10 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-11-23 21:21:53,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 37 transitions. [2023-11-23 21:21:53,368 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 37 transitions. Word has length 17 [2023-11-23 21:21:53,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:21:53,369 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 37 transitions. [2023-11-23 21:21:53,369 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2023-11-23 21:21:53,370 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 37 transitions. [2023-11-23 21:21:53,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-11-23 21:21:53,372 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:21:53,372 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:21:53,373 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-23 21:21:53,373 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:21:53,374 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:21:53,375 INFO L85 PathProgramCache]: Analyzing trace with hash 1804559349, now seen corresponding path program 1 times [2023-11-23 21:21:53,375 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:21:53,375 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [403346774] [2023-11-23 21:21:53,376 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:21:53,376 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:21:53,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:21:53,567 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-23 21:21:53,568 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:21:53,568 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [403346774] [2023-11-23 21:21:53,568 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [403346774] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:21:53,569 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:21:53,569 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-23 21:21:53,569 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1291034837] [2023-11-23 21:21:53,570 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:21:53,571 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-23 21:21:53,572 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:21:53,573 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-23 21:21:53,573 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-23 21:21:53,574 INFO L87 Difference]: Start difference. First operand 29 states and 37 transitions. Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2023-11-23 21:21:53,722 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:21:53,722 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2023-11-23 21:21:53,723 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-23 21:21:53,723 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 22 [2023-11-23 21:21:53,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:21:53,725 INFO L225 Difference]: With dead ends: 41 [2023-11-23 21:21:53,726 INFO L226 Difference]: Without dead ends: 39 [2023-11-23 21:21:53,726 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:21:53,729 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 8 mSDsluCounter, 69 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:21:53,730 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 98 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:21:53,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2023-11-23 21:21:53,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 33. [2023-11-23 21:21:53,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 19 states have internal predecessors, (21), 10 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-11-23 21:21:53,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 40 transitions. [2023-11-23 21:21:53,747 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 40 transitions. Word has length 22 [2023-11-23 21:21:53,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:21:53,748 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 40 transitions. [2023-11-23 21:21:53,748 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2023-11-23 21:21:53,749 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 40 transitions. [2023-11-23 21:21:53,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2023-11-23 21:21:53,750 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:21:53,750 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:21:53,751 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-23 21:21:53,751 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:21:53,752 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:21:53,752 INFO L85 PathProgramCache]: Analyzing trace with hash 496345742, now seen corresponding path program 1 times [2023-11-23 21:21:53,753 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:21:53,753 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1235683259] [2023-11-23 21:21:53,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:21:53,754 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:21:53,775 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-23 21:21:53,776 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2042592084] [2023-11-23 21:21:53,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:21:53,777 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:21:53,777 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51723ed3-5288-40b1-b254-baae100add11/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:21:53,779 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51723ed3-5288-40b1-b254-baae100add11/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:21:53,793 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51723ed3-5288-40b1-b254-baae100add11/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-23 21:21:53,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:21:53,883 INFO L262 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 7 conjunts are in the unsatisfiable core [2023-11-23 21:21:53,893 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:21:54,086 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-23 21:21:54,086 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:21:54,087 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:21:54,087 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1235683259] [2023-11-23 21:21:54,088 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-23 21:21:54,089 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2042592084] [2023-11-23 21:21:54,097 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2042592084] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:21:54,100 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:21:54,101 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-23 21:21:54,102 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1834753409] [2023-11-23 21:21:54,103 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:21:54,104 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-23 21:21:54,105 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:21:54,107 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-23 21:21:54,109 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-23 21:21:54,110 INFO L87 Difference]: Start difference. First operand 33 states and 40 transitions. Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2023-11-23 21:21:54,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:21:54,274 INFO L93 Difference]: Finished difference Result 60 states and 78 transitions. [2023-11-23 21:21:54,275 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-23 21:21:54,275 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 27 [2023-11-23 21:21:54,276 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:21:54,281 INFO L225 Difference]: With dead ends: 60 [2023-11-23 21:21:54,281 INFO L226 Difference]: Without dead ends: 47 [2023-11-23 21:21:54,282 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:21:54,288 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 8 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 95 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:21:54,289 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 95 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:21:54,292 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2023-11-23 21:21:54,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2023-11-23 21:21:54,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 25 states have (on average 1.16) internal successors, (29), 27 states have internal predecessors, (29), 16 states have call successors, (16), 5 states have call predecessors, (16), 5 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2023-11-23 21:21:54,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 59 transitions. [2023-11-23 21:21:54,326 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 59 transitions. Word has length 27 [2023-11-23 21:21:54,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:21:54,327 INFO L495 AbstractCegarLoop]: Abstraction has 47 states and 59 transitions. [2023-11-23 21:21:54,327 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2023-11-23 21:21:54,327 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 59 transitions. [2023-11-23 21:21:54,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2023-11-23 21:21:54,329 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:21:54,330 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:21:54,363 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51723ed3-5288-40b1-b254-baae100add11/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-23 21:21:54,543 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51723ed3-5288-40b1-b254-baae100add11/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:21:54,544 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:21:54,544 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:21:54,544 INFO L85 PathProgramCache]: Analyzing trace with hash -1046956766, now seen corresponding path program 1 times [2023-11-23 21:21:54,544 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:21:54,545 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1526715233] [2023-11-23 21:21:54,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:21:54,545 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:21:54,559 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-23 21:21:54,560 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [448055456] [2023-11-23 21:21:54,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:21:54,560 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:21:54,560 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51723ed3-5288-40b1-b254-baae100add11/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:21:54,561 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51723ed3-5288-40b1-b254-baae100add11/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:21:54,587 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51723ed3-5288-40b1-b254-baae100add11/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-23 21:21:54,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:21:54,624 INFO L262 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 15 conjunts are in the unsatisfiable core [2023-11-23 21:21:54,627 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:21:54,796 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-23 21:21:54,796 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:21:55,135 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-23 21:21:55,135 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:21:55,139 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1526715233] [2023-11-23 21:21:55,139 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-23 21:21:55,143 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [448055456] [2023-11-23 21:21:55,143 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [448055456] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:21:55,147 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [345921162] [2023-11-23 21:21:55,172 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-11-23 21:21:55,173 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:21:55,178 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:21:55,184 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:21:55,185 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:21:56,294 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2023-11-23 21:21:56,300 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2023-11-23 21:21:56,302 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:21:56,939 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [345921162] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:21:56,941 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-11-23 21:21:56,942 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [7, 7] total 20 [2023-11-23 21:21:56,943 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [723177721] [2023-11-23 21:21:56,943 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:21:56,944 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-11-23 21:21:56,944 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:21:56,946 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-11-23 21:21:56,947 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=299, Unknown=0, NotChecked=0, Total=380 [2023-11-23 21:21:56,948 INFO L87 Difference]: Start difference. First operand 47 states and 59 transitions. Second operand has 12 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 7 states have internal predecessors, (12), 5 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2023-11-23 21:21:57,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:21:57,421 INFO L93 Difference]: Finished difference Result 61 states and 70 transitions. [2023-11-23 21:21:57,422 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-11-23 21:21:57,422 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 7 states have internal predecessors, (12), 5 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 34 [2023-11-23 21:21:57,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:21:57,424 INFO L225 Difference]: With dead ends: 61 [2023-11-23 21:21:57,424 INFO L226 Difference]: Without dead ends: 50 [2023-11-23 21:21:57,425 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 81 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=107, Invalid=399, Unknown=0, NotChecked=0, Total=506 [2023-11-23 21:21:57,428 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 32 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 143 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 179 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 143 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-23 21:21:57,430 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [40 Valid, 41 Invalid, 179 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 143 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-23 21:21:57,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2023-11-23 21:21:57,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2023-11-23 21:21:57,472 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 29 states have (on average 1.103448275862069) internal successors, (32), 30 states have internal predecessors, (32), 13 states have call successors, (13), 7 states have call predecessors, (13), 7 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2023-11-23 21:21:57,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 57 transitions. [2023-11-23 21:21:57,477 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 57 transitions. Word has length 34 [2023-11-23 21:21:57,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:21:57,478 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 57 transitions. [2023-11-23 21:21:57,478 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 7 states have internal predecessors, (12), 5 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2023-11-23 21:21:57,479 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 57 transitions. [2023-11-23 21:21:57,483 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2023-11-23 21:21:57,483 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:21:57,483 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:21:57,512 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51723ed3-5288-40b1-b254-baae100add11/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-23 21:21:57,705 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51723ed3-5288-40b1-b254-baae100add11/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:21:57,706 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:21:57,706 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:21:57,706 INFO L85 PathProgramCache]: Analyzing trace with hash -202147981, now seen corresponding path program 1 times [2023-11-23 21:21:57,707 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:21:57,707 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [780179285] [2023-11-23 21:21:57,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:21:57,707 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:21:57,722 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-23 21:21:57,722 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [982069144] [2023-11-23 21:21:57,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:21:57,723 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:21:57,723 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51723ed3-5288-40b1-b254-baae100add11/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:21:57,724 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51723ed3-5288-40b1-b254-baae100add11/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:21:57,745 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51723ed3-5288-40b1-b254-baae100add11/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-23 21:21:57,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:21:57,792 INFO L262 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 11 conjunts are in the unsatisfiable core [2023-11-23 21:21:57,797 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:21:57,899 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 10 proven. 4 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2023-11-23 21:21:57,900 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:21:58,010 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2023-11-23 21:21:58,010 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:21:58,010 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [780179285] [2023-11-23 21:21:58,010 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-23 21:21:58,011 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [982069144] [2023-11-23 21:21:58,011 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [982069144] provided 1 perfect and 1 imperfect interpolant sequences [2023-11-23 21:21:58,012 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:21:58,017 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 7 [2023-11-23 21:21:58,017 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [931818273] [2023-11-23 21:21:58,017 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:21:58,018 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-23 21:21:58,018 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:21:58,019 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-23 21:21:58,019 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-11-23 21:21:58,020 INFO L87 Difference]: Start difference. First operand 50 states and 57 transitions. Second operand has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2023-11-23 21:21:59,962 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.85s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-11-23 21:21:59,982 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:21:59,982 INFO L93 Difference]: Finished difference Result 62 states and 72 transitions. [2023-11-23 21:21:59,987 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-23 21:21:59,987 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 44 [2023-11-23 21:21:59,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:21:59,989 INFO L225 Difference]: With dead ends: 62 [2023-11-23 21:21:59,989 INFO L226 Difference]: Without dead ends: 60 [2023-11-23 21:21:59,989 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 79 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2023-11-23 21:21:59,990 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 8 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 91 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2023-11-23 21:21:59,990 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 91 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2023-11-23 21:21:59,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2023-11-23 21:22:00,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 57. [2023-11-23 21:22:00,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 33 states have (on average 1.0909090909090908) internal successors, (36), 35 states have internal predecessors, (36), 15 states have call successors, (15), 8 states have call predecessors, (15), 8 states have return successors, (14), 13 states have call predecessors, (14), 14 states have call successors, (14) [2023-11-23 21:22:00,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 65 transitions. [2023-11-23 21:22:00,025 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 65 transitions. Word has length 44 [2023-11-23 21:22:00,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:22:00,027 INFO L495 AbstractCegarLoop]: Abstraction has 57 states and 65 transitions. [2023-11-23 21:22:00,028 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2023-11-23 21:22:00,028 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 65 transitions. [2023-11-23 21:22:00,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2023-11-23 21:22:00,029 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:22:00,029 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:22:00,051 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51723ed3-5288-40b1-b254-baae100add11/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-23 21:22:00,244 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51723ed3-5288-40b1-b254-baae100add11/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:22:00,244 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:22:00,245 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:22:00,245 INFO L85 PathProgramCache]: Analyzing trace with hash -567180131, now seen corresponding path program 1 times [2023-11-23 21:22:00,245 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:22:00,245 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1503213526] [2023-11-23 21:22:00,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:22:00,245 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:22:00,263 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-23 21:22:00,273 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1235247122] [2023-11-23 21:22:00,273 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:22:00,273 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:22:00,273 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51723ed3-5288-40b1-b254-baae100add11/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:22:00,277 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51723ed3-5288-40b1-b254-baae100add11/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:22:00,293 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51723ed3-5288-40b1-b254-baae100add11/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-23 21:22:00,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:22:00,341 INFO L262 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 7 conjunts are in the unsatisfiable core [2023-11-23 21:22:00,345 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:22:00,472 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2023-11-23 21:22:00,473 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:22:00,473 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:22:00,473 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1503213526] [2023-11-23 21:22:00,473 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-23 21:22:00,473 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1235247122] [2023-11-23 21:22:00,474 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1235247122] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:22:00,474 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:22:00,474 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-23 21:22:00,474 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [152899410] [2023-11-23 21:22:00,474 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:22:00,475 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-23 21:22:00,475 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:22:00,476 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-23 21:22:00,476 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-23 21:22:00,476 INFO L87 Difference]: Start difference. First operand 57 states and 65 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2023-11-23 21:22:00,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:22:00,554 INFO L93 Difference]: Finished difference Result 66 states and 75 transitions. [2023-11-23 21:22:00,554 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-23 21:22:00,555 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 51 [2023-11-23 21:22:00,555 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:22:00,556 INFO L225 Difference]: With dead ends: 66 [2023-11-23 21:22:00,556 INFO L226 Difference]: Without dead ends: 64 [2023-11-23 21:22:00,557 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:22:00,558 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 6 mSDsluCounter, 61 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:22:00,558 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 84 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 21:22:00,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2023-11-23 21:22:00,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2023-11-23 21:22:00,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 37 states have (on average 1.1081081081081081) internal successors, (41), 39 states have internal predecessors, (41), 16 states have call successors, (16), 9 states have call predecessors, (16), 9 states have return successors, (15), 14 states have call predecessors, (15), 15 states have call successors, (15) [2023-11-23 21:22:00,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 72 transitions. [2023-11-23 21:22:00,585 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 72 transitions. Word has length 51 [2023-11-23 21:22:00,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:22:00,585 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 72 transitions. [2023-11-23 21:22:00,585 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2023-11-23 21:22:00,586 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 72 transitions. [2023-11-23 21:22:00,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2023-11-23 21:22:00,587 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:22:00,587 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:22:00,613 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51723ed3-5288-40b1-b254-baae100add11/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-23 21:22:00,800 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51723ed3-5288-40b1-b254-baae100add11/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-11-23 21:22:00,800 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:22:00,801 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:22:00,801 INFO L85 PathProgramCache]: Analyzing trace with hash 166119996, now seen corresponding path program 1 times [2023-11-23 21:22:00,801 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:22:00,801 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [785710518] [2023-11-23 21:22:00,801 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:22:00,801 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:22:00,812 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-23 21:22:00,813 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2007682700] [2023-11-23 21:22:00,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:22:00,813 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:22:00,813 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51723ed3-5288-40b1-b254-baae100add11/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:22:00,814 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51723ed3-5288-40b1-b254-baae100add11/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:22:00,820 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51723ed3-5288-40b1-b254-baae100add11/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-23 21:22:00,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:22:00,894 INFO L262 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 30 conjunts are in the unsatisfiable core [2023-11-23 21:22:00,897 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:22:01,397 INFO L134 CoverageAnalysis]: Checked inductivity of 141 backedges. 18 proven. 7 refuted. 0 times theorem prover too weak. 116 trivial. 0 not checked. [2023-11-23 21:22:01,397 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:22:05,585 INFO L134 CoverageAnalysis]: Checked inductivity of 141 backedges. 16 proven. 7 refuted. 0 times theorem prover too weak. 118 trivial. 0 not checked. [2023-11-23 21:22:05,586 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:22:05,586 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [785710518] [2023-11-23 21:22:05,586 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-23 21:22:05,586 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2007682700] [2023-11-23 21:22:05,586 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2007682700] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:22:05,586 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1932665112] [2023-11-23 21:22:05,590 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2023-11-23 21:22:05,590 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:22:05,590 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:22:05,591 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:22:05,591 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:22:09,317 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2023-11-23 21:22:09,323 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2023-11-23 21:22:09,324 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:22:10,805 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2096#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-11-23 21:22:10,805 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:22:10,805 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-23 21:22:10,805 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8] total 16 [2023-11-23 21:22:10,806 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2128614477] [2023-11-23 21:22:10,806 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-23 21:22:10,806 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-11-23 21:22:10,807 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:22:10,807 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-11-23 21:22:10,808 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=708, Unknown=0, NotChecked=0, Total=812 [2023-11-23 21:22:10,808 INFO L87 Difference]: Start difference. First operand 63 states and 72 transitions. Second operand has 16 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 13 states have internal predecessors, (28), 9 states have call successors, (21), 3 states have call predecessors, (21), 2 states have return successors, (20), 8 states have call predecessors, (20), 7 states have call successors, (20) [2023-11-23 21:22:12,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:22:12,565 INFO L93 Difference]: Finished difference Result 132 states and 163 transitions. [2023-11-23 21:22:12,565 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-11-23 21:22:12,566 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 13 states have internal predecessors, (28), 9 states have call successors, (21), 3 states have call predecessors, (21), 2 states have return successors, (20), 8 states have call predecessors, (20), 7 states have call successors, (20) Word has length 63 [2023-11-23 21:22:12,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:22:12,570 INFO L225 Difference]: With dead ends: 132 [2023-11-23 21:22:12,570 INFO L226 Difference]: Without dead ends: 120 [2023-11-23 21:22:12,571 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 159 SyntacticMatches, 1 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 344 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=155, Invalid=1035, Unknown=0, NotChecked=0, Total=1190 [2023-11-23 21:22:12,572 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 48 mSDsluCounter, 237 mSDsCounter, 0 mSdLazyCounter, 267 mSolverCounterSat, 68 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 266 SdHoareTripleChecker+Invalid, 335 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 68 IncrementalHoareTripleChecker+Valid, 267 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:22:12,573 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [51 Valid, 266 Invalid, 335 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [68 Valid, 267 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2023-11-23 21:22:12,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2023-11-23 21:22:12,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 108. [2023-11-23 21:22:12,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 108 states, 63 states have (on average 1.126984126984127) internal successors, (71), 66 states have internal predecessors, (71), 30 states have call successors, (30), 14 states have call predecessors, (30), 14 states have return successors, (29), 27 states have call predecessors, (29), 29 states have call successors, (29) [2023-11-23 21:22:12,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 130 transitions. [2023-11-23 21:22:12,632 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 130 transitions. Word has length 63 [2023-11-23 21:22:12,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:22:12,633 INFO L495 AbstractCegarLoop]: Abstraction has 108 states and 130 transitions. [2023-11-23 21:22:12,633 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 13 states have internal predecessors, (28), 9 states have call successors, (21), 3 states have call predecessors, (21), 2 states have return successors, (20), 8 states have call predecessors, (20), 7 states have call successors, (20) [2023-11-23 21:22:12,633 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 130 transitions. [2023-11-23 21:22:12,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2023-11-23 21:22:12,635 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:22:12,635 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:22:12,664 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51723ed3-5288-40b1-b254-baae100add11/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-23 21:22:12,852 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51723ed3-5288-40b1-b254-baae100add11/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-11-23 21:22:12,852 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:22:12,853 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:22:12,853 INFO L85 PathProgramCache]: Analyzing trace with hash 1699758119, now seen corresponding path program 2 times [2023-11-23 21:22:12,853 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:22:12,853 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1870535674] [2023-11-23 21:22:12,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:22:12,853 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:22:12,872 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-23 21:22:12,875 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [50019692] [2023-11-23 21:22:12,876 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-23 21:22:12,876 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:22:12,876 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51723ed3-5288-40b1-b254-baae100add11/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:22:12,877 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51723ed3-5288-40b1-b254-baae100add11/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:22:12,904 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51723ed3-5288-40b1-b254-baae100add11/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-23 21:22:12,948 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-23 21:22:12,948 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 21:22:12,949 INFO L262 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 25 conjunts are in the unsatisfiable core [2023-11-23 21:22:12,953 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:22:13,099 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 18 proven. 10 refuted. 0 times theorem prover too weak. 148 trivial. 0 not checked. [2023-11-23 21:22:13,100 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:22:14,260 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 18 proven. 8 refuted. 0 times theorem prover too weak. 150 trivial. 0 not checked. [2023-11-23 21:22:14,261 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:22:14,261 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1870535674] [2023-11-23 21:22:14,261 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-23 21:22:14,261 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [50019692] [2023-11-23 21:22:14,261 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [50019692] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:22:14,261 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1004441870] [2023-11-23 21:22:14,270 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2023-11-23 21:22:14,270 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:22:14,270 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:22:14,270 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:22:14,271 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:22:16,504 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2023-11-23 21:22:16,510 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2023-11-23 21:22:16,511 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:22:17,400 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2896#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-11-23 21:22:17,400 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:22:17,400 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-23 21:22:17,400 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 11 [2023-11-23 21:22:17,400 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1009333437] [2023-11-23 21:22:17,400 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-23 21:22:17,401 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-11-23 21:22:17,401 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:22:17,402 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-11-23 21:22:17,403 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=475, Unknown=0, NotChecked=0, Total=552 [2023-11-23 21:22:17,403 INFO L87 Difference]: Start difference. First operand 108 states and 130 transitions. Second operand has 11 states, 10 states have (on average 2.8) internal successors, (28), 9 states have internal predecessors, (28), 5 states have call successors, (23), 3 states have call predecessors, (23), 2 states have return successors, (22), 5 states have call predecessors, (22), 5 states have call successors, (22) [2023-11-23 21:22:18,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:22:18,420 INFO L93 Difference]: Finished difference Result 135 states and 167 transitions. [2023-11-23 21:22:18,421 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-11-23 21:22:18,421 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 2.8) internal successors, (28), 9 states have internal predecessors, (28), 5 states have call successors, (23), 3 states have call predecessors, (23), 2 states have return successors, (22), 5 states have call predecessors, (22), 5 states have call successors, (22) Word has length 68 [2023-11-23 21:22:18,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:22:18,423 INFO L225 Difference]: With dead ends: 135 [2023-11-23 21:22:18,423 INFO L226 Difference]: Without dead ends: 116 [2023-11-23 21:22:18,424 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 179 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 160 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=94, Invalid=608, Unknown=0, NotChecked=0, Total=702 [2023-11-23 21:22:18,425 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 12 mSDsluCounter, 165 mSDsCounter, 0 mSdLazyCounter, 151 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 202 SdHoareTripleChecker+Invalid, 168 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 151 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-23 21:22:18,425 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 202 Invalid, 168 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 151 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-23 21:22:18,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2023-11-23 21:22:18,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 116. [2023-11-23 21:22:18,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 67 states have (on average 1.1044776119402986) internal successors, (74), 70 states have internal predecessors, (74), 34 states have call successors, (34), 14 states have call predecessors, (34), 14 states have return successors, (32), 31 states have call predecessors, (32), 32 states have call successors, (32) [2023-11-23 21:22:18,479 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 140 transitions. [2023-11-23 21:22:18,479 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 140 transitions. Word has length 68 [2023-11-23 21:22:18,479 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:22:18,480 INFO L495 AbstractCegarLoop]: Abstraction has 116 states and 140 transitions. [2023-11-23 21:22:18,480 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 2.8) internal successors, (28), 9 states have internal predecessors, (28), 5 states have call successors, (23), 3 states have call predecessors, (23), 2 states have return successors, (22), 5 states have call predecessors, (22), 5 states have call successors, (22) [2023-11-23 21:22:18,480 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 140 transitions. [2023-11-23 21:22:18,482 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2023-11-23 21:22:18,482 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:22:18,482 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:22:18,508 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51723ed3-5288-40b1-b254-baae100add11/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-23 21:22:18,700 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51723ed3-5288-40b1-b254-baae100add11/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2023-11-23 21:22:18,700 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:22:18,701 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:22:18,701 INFO L85 PathProgramCache]: Analyzing trace with hash 1987386298, now seen corresponding path program 1 times [2023-11-23 21:22:18,701 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:22:18,701 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1301460228] [2023-11-23 21:22:18,701 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:22:18,702 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:22:18,711 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-23 21:22:18,711 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [445134021] [2023-11-23 21:22:18,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:22:18,711 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:22:18,711 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51723ed3-5288-40b1-b254-baae100add11/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:22:18,713 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51723ed3-5288-40b1-b254-baae100add11/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:22:18,746 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51723ed3-5288-40b1-b254-baae100add11/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-23 21:22:18,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:22:18,786 INFO L262 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 23 conjunts are in the unsatisfiable core [2023-11-23 21:22:18,789 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:22:19,227 INFO L134 CoverageAnalysis]: Checked inductivity of 215 backedges. 22 proven. 9 refuted. 0 times theorem prover too weak. 184 trivial. 0 not checked. [2023-11-23 21:22:19,228 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:22:19,614 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:22:19,614 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1301460228] [2023-11-23 21:22:19,614 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-23 21:22:19,614 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [445134021] [2023-11-23 21:22:19,615 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [445134021] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:22:19,615 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [184960629] [2023-11-23 21:22:19,620 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2023-11-23 21:22:19,621 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:22:19,621 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:22:19,621 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:22:19,622 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:22:22,034 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2023-11-23 21:22:22,040 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2023-11-23 21:22:22,042 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:22:22,880 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3585#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-11-23 21:22:22,881 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:22:22,881 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:22:22,881 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2023-11-23 21:22:22,881 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [293281268] [2023-11-23 21:22:22,881 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-11-23 21:22:22,884 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-11-23 21:22:22,884 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:22:22,885 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-11-23 21:22:22,886 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=762, Unknown=0, NotChecked=0, Total=870 [2023-11-23 21:22:22,886 INFO L87 Difference]: Start difference. First operand 116 states and 140 transitions. Second operand has 11 states, 9 states have (on average 2.111111111111111) internal successors, (19), 9 states have internal predecessors, (19), 6 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (13), 6 states have call predecessors, (13), 5 states have call successors, (13) [2023-11-23 21:22:23,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:22:23,343 INFO L93 Difference]: Finished difference Result 122 states and 145 transitions. [2023-11-23 21:22:23,343 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-11-23 21:22:23,343 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 9 states have (on average 2.111111111111111) internal successors, (19), 9 states have internal predecessors, (19), 6 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (13), 6 states have call predecessors, (13), 5 states have call successors, (13) Word has length 74 [2023-11-23 21:22:23,344 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:22:23,346 INFO L225 Difference]: With dead ends: 122 [2023-11-23 21:22:23,346 INFO L226 Difference]: Without dead ends: 107 [2023-11-23 21:22:23,347 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 135 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 319 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=150, Invalid=1110, Unknown=0, NotChecked=0, Total=1260 [2023-11-23 21:22:23,348 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 20 mSDsluCounter, 206 mSDsCounter, 0 mSdLazyCounter, 193 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 235 SdHoareTripleChecker+Invalid, 209 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 193 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 21:22:23,349 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 235 Invalid, 209 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 193 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-23 21:22:23,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2023-11-23 21:22:23,401 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 107. [2023-11-23 21:22:23,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 63 states have (on average 1.0793650793650793) internal successors, (68), 65 states have internal predecessors, (68), 29 states have call successors, (29), 14 states have call predecessors, (29), 14 states have return successors, (28), 27 states have call predecessors, (28), 28 states have call successors, (28) [2023-11-23 21:22:23,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 125 transitions. [2023-11-23 21:22:23,403 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 125 transitions. Word has length 74 [2023-11-23 21:22:23,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:22:23,404 INFO L495 AbstractCegarLoop]: Abstraction has 107 states and 125 transitions. [2023-11-23 21:22:23,404 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 9 states have (on average 2.111111111111111) internal successors, (19), 9 states have internal predecessors, (19), 6 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (13), 6 states have call predecessors, (13), 5 states have call successors, (13) [2023-11-23 21:22:23,405 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 125 transitions. [2023-11-23 21:22:23,406 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2023-11-23 21:22:23,406 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:22:23,407 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:22:23,433 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51723ed3-5288-40b1-b254-baae100add11/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2023-11-23 21:22:23,631 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51723ed3-5288-40b1-b254-baae100add11/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:22:23,632 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:22:23,632 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:22:23,632 INFO L85 PathProgramCache]: Analyzing trace with hash 339357760, now seen corresponding path program 3 times [2023-11-23 21:22:23,633 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:22:23,633 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [388719474] [2023-11-23 21:22:23,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:22:23,633 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:22:23,649 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-23 21:22:23,652 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [56572819] [2023-11-23 21:22:23,652 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-23 21:22:23,652 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:22:23,653 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51723ed3-5288-40b1-b254-baae100add11/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:22:23,654 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51723ed3-5288-40b1-b254-baae100add11/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:22:23,658 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_51723ed3-5288-40b1-b254-baae100add11/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-23 21:22:23,748 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-23 21:22:23,748 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 21:22:23,750 INFO L262 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 40 conjunts are in the unsatisfiable core [2023-11-23 21:22:23,754 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:22:24,596 INFO L134 CoverageAnalysis]: Checked inductivity of 367 backedges. 34 proven. 51 refuted. 0 times theorem prover too weak. 282 trivial. 0 not checked. [2023-11-23 21:22:24,596 INFO L327 TraceCheckSpWp]: Computing backward predicates...