./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/egcd-ll_unwindbound50.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0e0057cc Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d4b6c12-64be-4156-b759-b0a6a05b133f/bin/utaipan-verify-SwPr7d2a91/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d4b6c12-64be-4156-b759-b0a6a05b133f/bin/utaipan-verify-SwPr7d2a91/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d4b6c12-64be-4156-b759-b0a6a05b133f/bin/utaipan-verify-SwPr7d2a91/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d4b6c12-64be-4156-b759-b0a6a05b133f/bin/utaipan-verify-SwPr7d2a91/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/egcd-ll_unwindbound50.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d4b6c12-64be-4156-b759-b0a6a05b133f/bin/utaipan-verify-SwPr7d2a91/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d4b6c12-64be-4156-b759-b0a6a05b133f/bin/utaipan-verify-SwPr7d2a91 --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 2d26d8e14d33b8c29eaf9ffa7603dd26966f962451e6c0726b154a73bf65f3d2 --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-11-24 23:53:18,031 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-24 23:53:18,152 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d4b6c12-64be-4156-b759-b0a6a05b133f/bin/utaipan-verify-SwPr7d2a91/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-24 23:53:18,159 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-24 23:53:18,160 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-24 23:53:18,184 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-24 23:53:18,185 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-24 23:53:18,185 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-24 23:53:18,186 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-24 23:53:18,186 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-24 23:53:18,187 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-24 23:53:18,188 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-24 23:53:18,188 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-24 23:53:18,189 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-24 23:53:18,189 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-24 23:53:18,190 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-24 23:53:18,190 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-24 23:53:18,191 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-24 23:53:18,191 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-24 23:53:18,192 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-24 23:53:18,192 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-24 23:53:18,193 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-24 23:53:18,194 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-24 23:53:18,194 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-24 23:53:18,195 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-24 23:53:18,195 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-24 23:53:18,195 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-24 23:53:18,196 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-24 23:53:18,196 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-24 23:53:18,197 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-24 23:53:18,197 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-24 23:53:18,221 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-24 23:53:18,222 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-24 23:53:18,222 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-24 23:53:18,222 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-24 23:53:18,222 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-24 23:53:18,223 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-24 23:53:18,223 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-24 23:53:18,223 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-24 23:53:18,223 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-24 23:53:18,224 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-24 23:53:18,224 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-24 23:53:18,224 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-24 23:53:18,224 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-24 23:53:18,225 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-24 23:53:18,225 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-24 23:53:18,226 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-24 23:53:18,226 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_8d4b6c12-64be-4156-b759-b0a6a05b133f/bin/utaipan-verify-SwPr7d2a91/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d4b6c12-64be-4156-b759-b0a6a05b133f/bin/utaipan-verify-SwPr7d2a91 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 2d26d8e14d33b8c29eaf9ffa7603dd26966f962451e6c0726b154a73bf65f3d2 [2023-11-24 23:53:18,551 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-24 23:53:18,576 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-24 23:53:18,579 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-24 23:53:18,580 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-24 23:53:18,581 INFO L274 PluginConnector]: CDTParser initialized [2023-11-24 23:53:18,582 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d4b6c12-64be-4156-b759-b0a6a05b133f/bin/utaipan-verify-SwPr7d2a91/../../sv-benchmarks/c/nla-digbench-scaling/egcd-ll_unwindbound50.c [2023-11-24 23:53:21,558 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-24 23:53:21,831 INFO L384 CDTParser]: Found 1 translation units. [2023-11-24 23:53:21,832 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d4b6c12-64be-4156-b759-b0a6a05b133f/sv-benchmarks/c/nla-digbench-scaling/egcd-ll_unwindbound50.c [2023-11-24 23:53:21,842 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d4b6c12-64be-4156-b759-b0a6a05b133f/bin/utaipan-verify-SwPr7d2a91/data/35fc51c80/775f01dec1104cb781a92122ba7ca117/FLAG939d22656 [2023-11-24 23:53:21,861 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d4b6c12-64be-4156-b759-b0a6a05b133f/bin/utaipan-verify-SwPr7d2a91/data/35fc51c80/775f01dec1104cb781a92122ba7ca117 [2023-11-24 23:53:21,868 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-24 23:53:21,869 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-24 23:53:21,871 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-24 23:53:21,871 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-24 23:53:21,877 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-24 23:53:21,878 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 11:53:21" (1/1) ... [2023-11-24 23:53:21,880 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@41e1accc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:53:21, skipping insertion in model container [2023-11-24 23:53:21,880 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 11:53:21" (1/1) ... [2023-11-24 23:53:21,919 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-24 23:53:22,127 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_8d4b6c12-64be-4156-b759-b0a6a05b133f/sv-benchmarks/c/nla-digbench-scaling/egcd-ll_unwindbound50.c[489,502] [2023-11-24 23:53:22,166 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-24 23:53:22,180 INFO L202 MainTranslator]: Completed pre-run [2023-11-24 23:53:22,196 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_8d4b6c12-64be-4156-b759-b0a6a05b133f/sv-benchmarks/c/nla-digbench-scaling/egcd-ll_unwindbound50.c[489,502] [2023-11-24 23:53:22,224 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-24 23:53:22,242 INFO L206 MainTranslator]: Completed translation [2023-11-24 23:53:22,243 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:53:22 WrapperNode [2023-11-24 23:53:22,243 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-24 23:53:22,244 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-24 23:53:22,244 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-24 23:53:22,245 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-24 23:53:22,252 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:53:22" (1/1) ... [2023-11-24 23:53:22,261 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:53:22" (1/1) ... [2023-11-24 23:53:22,288 INFO L138 Inliner]: procedures = 14, calls = 16, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 60 [2023-11-24 23:53:22,288 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-24 23:53:22,289 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-24 23:53:22,289 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-24 23:53:22,289 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-24 23:53:22,298 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:53:22" (1/1) ... [2023-11-24 23:53:22,299 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:53:22" (1/1) ... [2023-11-24 23:53:22,311 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:53:22" (1/1) ... [2023-11-24 23:53:22,312 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:53:22" (1/1) ... [2023-11-24 23:53:22,315 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:53:22" (1/1) ... [2023-11-24 23:53:22,321 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:53:22" (1/1) ... [2023-11-24 23:53:22,327 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:53:22" (1/1) ... [2023-11-24 23:53:22,333 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:53:22" (1/1) ... [2023-11-24 23:53:22,335 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-24 23:53:22,337 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-24 23:53:22,337 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-24 23:53:22,337 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-24 23:53:22,339 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:53:22" (1/1) ... [2023-11-24 23:53:22,345 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-24 23:53:22,364 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d4b6c12-64be-4156-b759-b0a6a05b133f/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:53:22,381 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d4b6c12-64be-4156-b759-b0a6a05b133f/bin/utaipan-verify-SwPr7d2a91/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-24 23:53:22,451 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d4b6c12-64be-4156-b759-b0a6a05b133f/bin/utaipan-verify-SwPr7d2a91/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-24 23:53:22,490 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-24 23:53:22,491 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-11-24 23:53:22,491 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-11-24 23:53:22,491 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-24 23:53:22,491 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-24 23:53:22,491 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-24 23:53:22,491 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-11-24 23:53:22,491 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-11-24 23:53:22,564 INFO L241 CfgBuilder]: Building ICFG [2023-11-24 23:53:22,567 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-24 23:53:22,723 INFO L282 CfgBuilder]: Performing block encoding [2023-11-24 23:53:22,771 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-24 23:53:22,772 INFO L309 CfgBuilder]: Removed 1 assume(true) statements. [2023-11-24 23:53:22,774 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 11:53:22 BoogieIcfgContainer [2023-11-24 23:53:22,774 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-24 23:53:22,776 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-24 23:53:22,777 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-24 23:53:22,780 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-24 23:53:22,780 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.11 11:53:21" (1/3) ... [2023-11-24 23:53:22,781 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6429901f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.11 11:53:22, skipping insertion in model container [2023-11-24 23:53:22,782 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:53:22" (2/3) ... [2023-11-24 23:53:22,782 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6429901f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.11 11:53:22, skipping insertion in model container [2023-11-24 23:53:22,782 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 11:53:22" (3/3) ... [2023-11-24 23:53:22,783 INFO L112 eAbstractionObserver]: Analyzing ICFG egcd-ll_unwindbound50.c [2023-11-24 23:53:22,803 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-24 23:53:22,803 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-24 23:53:22,854 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-24 23:53:22,862 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;@65cb36c, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-24 23:53:22,862 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-24 23:53:22,866 INFO L276 IsEmpty]: Start isEmpty. Operand has 24 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-11-24 23:53:22,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-11-24 23:53:22,875 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:53:22,876 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:53:22,877 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:53:22,881 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:53:22,882 INFO L85 PathProgramCache]: Analyzing trace with hash 1798315609, now seen corresponding path program 1 times [2023-11-24 23:53:22,890 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:53:22,890 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1274062178] [2023-11-24 23:53:22,891 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:53:22,891 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:53:22,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:53:23,059 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-24 23:53:23,060 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:53:23,060 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1274062178] [2023-11-24 23:53:23,061 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1274062178] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:53:23,062 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 23:53:23,062 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-24 23:53:23,063 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1769142531] [2023-11-24 23:53:23,065 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:53:23,071 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-11-24 23:53:23,073 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:53:23,118 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-11-24 23:53:23,119 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-11-24 23:53:23,122 INFO L87 Difference]: Start difference. First operand has 24 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) Second operand has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-24 23:53:23,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:53:23,195 INFO L93 Difference]: Finished difference Result 42 states and 68 transitions. [2023-11-24 23:53:23,198 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-11-24 23:53:23,199 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 13 [2023-11-24 23:53:23,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:53:23,208 INFO L225 Difference]: With dead ends: 42 [2023-11-24 23:53:23,209 INFO L226 Difference]: Without dead ends: 22 [2023-11-24 23:53:23,213 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-11-24 23:53:23,218 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 4 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-24 23:53:23,220 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 28 Invalid, 4 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-24 23:53:23,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2023-11-24 23:53:23,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2023-11-24 23:53:23,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 10 states have (on average 1.3) internal successors, (13), 11 states have internal predecessors, (13), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2023-11-24 23:53:23,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 30 transitions. [2023-11-24 23:53:23,273 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 30 transitions. Word has length 13 [2023-11-24 23:53:23,275 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:53:23,276 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 30 transitions. [2023-11-24 23:53:23,276 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-24 23:53:23,277 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 30 transitions. [2023-11-24 23:53:23,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-11-24 23:53:23,279 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:53:23,279 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:53:23,280 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-24 23:53:23,280 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:53:23,281 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:53:23,282 INFO L85 PathProgramCache]: Analyzing trace with hash -740021117, now seen corresponding path program 1 times [2023-11-24 23:53:23,282 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:53:23,282 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [494955595] [2023-11-24 23:53:23,282 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:53:23,283 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:53:23,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:53:23,548 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-24 23:53:23,549 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:53:23,549 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [494955595] [2023-11-24 23:53:23,550 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [494955595] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:53:23,550 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 23:53:23,550 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-24 23:53:23,550 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1934863394] [2023-11-24 23:53:23,551 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:53:23,552 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-24 23:53:23,553 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:53:23,555 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-24 23:53:23,555 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-24 23:53:23,555 INFO L87 Difference]: Start difference. First operand 22 states and 30 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-24 23:53:23,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:53:23,604 INFO L93 Difference]: Finished difference Result 34 states and 45 transitions. [2023-11-24 23:53:23,612 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-24 23:53:23,612 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 14 [2023-11-24 23:53:23,613 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:53:23,615 INFO L225 Difference]: With dead ends: 34 [2023-11-24 23:53:23,616 INFO L226 Difference]: Without dead ends: 24 [2023-11-24 23:53:23,619 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-24 23:53:23,622 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 3 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 69 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-24 23:53:23,623 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 69 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-24 23:53:23,626 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2023-11-24 23:53:23,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2023-11-24 23:53:23,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 12 states have (on average 1.25) internal successors, (15), 13 states have internal predecessors, (15), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2023-11-24 23:53:23,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 32 transitions. [2023-11-24 23:53:23,644 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 32 transitions. Word has length 14 [2023-11-24 23:53:23,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:53:23,644 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 32 transitions. [2023-11-24 23:53:23,645 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-24 23:53:23,645 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 32 transitions. [2023-11-24 23:53:23,645 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-11-24 23:53:23,646 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:53:23,646 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:53:23,646 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-24 23:53:23,646 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:53:23,648 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:53:23,648 INFO L85 PathProgramCache]: Analyzing trace with hash -738352821, now seen corresponding path program 1 times [2023-11-24 23:53:23,649 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:53:23,649 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1109455389] [2023-11-24 23:53:23,650 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:53:23,650 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:53:23,687 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-24 23:53:23,688 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1284948325] [2023-11-24 23:53:23,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:53:23,688 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:53:23,689 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d4b6c12-64be-4156-b759-b0a6a05b133f/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:53:23,698 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d4b6c12-64be-4156-b759-b0a6a05b133f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:53:23,731 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d4b6c12-64be-4156-b759-b0a6a05b133f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-24 23:53:23,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:53:23,806 INFO L262 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 17 conjunts are in the unsatisfiable core [2023-11-24 23:53:23,814 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:53:23,995 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-24 23:53:23,996 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-24 23:53:23,996 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:53:23,997 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1109455389] [2023-11-24 23:53:23,997 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-24 23:53:23,998 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1284948325] [2023-11-24 23:53:24,003 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1284948325] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:53:24,004 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 23:53:24,005 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-24 23:53:24,006 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1593554429] [2023-11-24 23:53:24,007 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:53:24,008 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-24 23:53:24,009 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:53:24,012 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-24 23:53:24,013 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-24 23:53:24,014 INFO L87 Difference]: Start difference. First operand 24 states and 32 transitions. Second operand has 6 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-24 23:53:24,126 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:53:24,128 INFO L93 Difference]: Finished difference Result 38 states and 52 transitions. [2023-11-24 23:53:24,128 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-24 23:53:24,129 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 14 [2023-11-24 23:53:24,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:53:24,134 INFO L225 Difference]: With dead ends: 38 [2023-11-24 23:53:24,134 INFO L226 Difference]: Without dead ends: 36 [2023-11-24 23:53:24,135 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-11-24 23:53:24,137 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 6 mSDsluCounter, 76 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 97 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-24 23:53:24,139 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 97 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-24 23:53:24,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2023-11-24 23:53:24,152 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2023-11-24 23:53:24,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 16 states have (on average 1.25) internal successors, (20), 18 states have internal predecessors, (20), 15 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (14), 13 states have call predecessors, (14), 14 states have call successors, (14) [2023-11-24 23:53:24,162 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 49 transitions. [2023-11-24 23:53:24,163 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 49 transitions. Word has length 14 [2023-11-24 23:53:24,163 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:53:24,164 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 49 transitions. [2023-11-24 23:53:24,164 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-24 23:53:24,164 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 49 transitions. [2023-11-24 23:53:24,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-24 23:53:24,166 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:53:24,166 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:53:24,176 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d4b6c12-64be-4156-b759-b0a6a05b133f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-11-24 23:53:24,371 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d4b6c12-64be-4156-b759-b0a6a05b133f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:53:24,371 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:53:24,372 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:53:24,372 INFO L85 PathProgramCache]: Analyzing trace with hash 1930727335, now seen corresponding path program 1 times [2023-11-24 23:53:24,372 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:53:24,373 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [260360183] [2023-11-24 23:53:24,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:53:24,373 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:53:24,386 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-24 23:53:24,386 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1035223380] [2023-11-24 23:53:24,387 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:53:24,387 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:53:24,387 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d4b6c12-64be-4156-b759-b0a6a05b133f/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:53:24,388 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d4b6c12-64be-4156-b759-b0a6a05b133f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:53:24,411 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d4b6c12-64be-4156-b759-b0a6a05b133f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-24 23:53:24,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:53:24,466 INFO L262 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 23 conjunts are in the unsatisfiable core [2023-11-24 23:53:24,469 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:53:24,741 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-24 23:53:24,741 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:53:24,913 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:53:24,914 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [260360183] [2023-11-24 23:53:24,914 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-24 23:53:24,916 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1035223380] [2023-11-24 23:53:24,916 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1035223380] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:53:24,920 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [201906167] [2023-11-24 23:53:24,946 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-11-24 23:53:24,946 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:53:24,950 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-24 23:53:24,955 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-24 23:53:24,955 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-24 23:53:25,562 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 36 for LOIs [2023-11-24 23:53:25,595 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 64 for LOIs [2023-11-24 23:53:25,673 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-24 23:53:26,990 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [201906167] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:53:26,990 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-24 23:53:26,990 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [10] total 20 [2023-11-24 23:53:26,991 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2109687291] [2023-11-24 23:53:26,991 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:53:26,992 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-11-24 23:53:26,992 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:53:26,993 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-11-24 23:53:26,993 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=419, Unknown=0, NotChecked=0, Total=506 [2023-11-24 23:53:26,993 INFO L87 Difference]: Start difference. First operand 35 states and 49 transitions. Second operand has 12 states, 8 states have (on average 1.25) internal successors, (10), 7 states have internal predecessors, (10), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-24 23:53:27,326 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:53:27,326 INFO L93 Difference]: Finished difference Result 42 states and 55 transitions. [2023-11-24 23:53:27,327 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-11-24 23:53:27,327 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 8 states have (on average 1.25) internal successors, (10), 7 states have internal predecessors, (10), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 19 [2023-11-24 23:53:27,328 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:53:27,330 INFO L225 Difference]: With dead ends: 42 [2023-11-24 23:53:27,331 INFO L226 Difference]: Without dead ends: 38 [2023-11-24 23:53:27,332 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=87, Invalid=419, Unknown=0, NotChecked=0, Total=506 [2023-11-24 23:53:27,334 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 1 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 164 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 167 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 164 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-24 23:53:27,336 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 46 Invalid, 167 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 164 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-24 23:53:27,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2023-11-24 23:53:27,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2023-11-24 23:53:27,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 19 states have (on average 1.2105263157894737) internal successors, (23), 21 states have internal predecessors, (23), 14 states have call successors, (14), 4 states have call predecessors, (14), 4 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2023-11-24 23:53:27,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 49 transitions. [2023-11-24 23:53:27,367 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 49 transitions. Word has length 19 [2023-11-24 23:53:27,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:53:27,368 INFO L495 AbstractCegarLoop]: Abstraction has 38 states and 49 transitions. [2023-11-24 23:53:27,369 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 8 states have (on average 1.25) internal successors, (10), 7 states have internal predecessors, (10), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-24 23:53:27,369 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 49 transitions. [2023-11-24 23:53:27,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2023-11-24 23:53:27,370 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:53:27,370 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:53:27,382 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d4b6c12-64be-4156-b759-b0a6a05b133f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-24 23:53:27,576 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d4b6c12-64be-4156-b759-b0a6a05b133f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2023-11-24 23:53:27,577 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:53:27,577 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:53:27,578 INFO L85 PathProgramCache]: Analyzing trace with hash -1385830456, now seen corresponding path program 1 times [2023-11-24 23:53:27,578 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:53:27,578 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1621887401] [2023-11-24 23:53:27,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:53:27,578 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:53:27,589 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-24 23:53:27,590 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1109944427] [2023-11-24 23:53:27,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:53:27,590 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:53:27,590 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d4b6c12-64be-4156-b759-b0a6a05b133f/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:53:27,591 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d4b6c12-64be-4156-b759-b0a6a05b133f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:53:27,596 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d4b6c12-64be-4156-b759-b0a6a05b133f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-24 23:53:27,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:53:27,655 INFO L262 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-24 23:53:27,659 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:53:27,705 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-11-24 23:53:27,706 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-24 23:53:27,706 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:53:27,706 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1621887401] [2023-11-24 23:53:27,706 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-24 23:53:27,706 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1109944427] [2023-11-24 23:53:27,707 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1109944427] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:53:27,707 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 23:53:27,707 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-24 23:53:27,707 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [315938323] [2023-11-24 23:53:27,708 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:53:27,708 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-24 23:53:27,708 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:53:27,709 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-24 23:53:27,709 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-24 23:53:27,710 INFO L87 Difference]: Start difference. First operand 38 states and 49 transitions. Second operand has 5 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) [2023-11-24 23:53:27,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:53:27,786 INFO L93 Difference]: Finished difference Result 48 states and 61 transitions. [2023-11-24 23:53:27,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-24 23:53:27,788 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) Word has length 30 [2023-11-24 23:53:27,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:53:27,795 INFO L225 Difference]: With dead ends: 48 [2023-11-24 23:53:27,795 INFO L226 Difference]: Without dead ends: 46 [2023-11-24 23:53:27,796 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-24 23:53:27,797 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 5 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 106 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-24 23:53:27,798 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 106 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-24 23:53:27,798 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2023-11-24 23:53:27,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 43. [2023-11-24 23:53:27,812 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 22 states have (on average 1.1818181818181819) internal successors, (26), 25 states have internal predecessors, (26), 15 states have call successors, (15), 5 states have call predecessors, (15), 5 states have return successors, (13), 12 states have call predecessors, (13), 13 states have call successors, (13) [2023-11-24 23:53:27,814 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 54 transitions. [2023-11-24 23:53:27,814 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 54 transitions. Word has length 30 [2023-11-24 23:53:27,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:53:27,815 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 54 transitions. [2023-11-24 23:53:27,815 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) [2023-11-24 23:53:27,816 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 54 transitions. [2023-11-24 23:53:27,817 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2023-11-24 23:53:27,817 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:53:27,818 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:53:27,828 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d4b6c12-64be-4156-b759-b0a6a05b133f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-11-24 23:53:28,023 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d4b6c12-64be-4156-b759-b0a6a05b133f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:53:28,023 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:53:28,023 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:53:28,024 INFO L85 PathProgramCache]: Analyzing trace with hash -1128008437, now seen corresponding path program 1 times [2023-11-24 23:53:28,024 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:53:28,024 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1080980827] [2023-11-24 23:53:28,024 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:53:28,024 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:53:28,035 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-24 23:53:28,043 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [265939750] [2023-11-24 23:53:28,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:53:28,043 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:53:28,043 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d4b6c12-64be-4156-b759-b0a6a05b133f/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:53:28,044 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d4b6c12-64be-4156-b759-b0a6a05b133f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:53:28,067 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d4b6c12-64be-4156-b759-b0a6a05b133f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-24 23:53:28,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:53:28,114 INFO L262 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-24 23:53:28,117 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:53:28,168 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-11-24 23:53:28,168 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:53:28,223 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-11-24 23:53:28,223 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:53:28,223 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1080980827] [2023-11-24 23:53:28,224 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-24 23:53:28,224 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [265939750] [2023-11-24 23:53:28,224 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [265939750] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 23:53:28,224 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1496072238] [2023-11-24 23:53:28,227 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-11-24 23:53:28,227 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:53:28,228 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-24 23:53:28,229 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-24 23:53:28,229 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-24 23:53:29,957 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2023-11-24 23:53:29,963 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 64 for LOIs [2023-11-24 23:53:30,002 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-24 23:53:38,863 WARN L293 SmtUtils]: Spent 8.06s on a formula simplification. DAG size of input: 106 DAG size of output: 103 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-11-24 23:53:52,908 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1020#(and (<= 1 |#StackHeapBarrier|) (<= 1 ~counter~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-11-24 23:53:52,908 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-24 23:53:52,908 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-24 23:53:52,909 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 8 [2023-11-24 23:53:52,909 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [513182362] [2023-11-24 23:53:52,909 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-24 23:53:52,910 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-24 23:53:52,910 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:53:52,911 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-24 23:53:52,911 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=410, Unknown=2, NotChecked=0, Total=506 [2023-11-24 23:53:52,912 INFO L87 Difference]: Start difference. First operand 43 states and 54 transitions. Second operand has 8 states, 8 states have (on average 3.125) internal successors, (25), 8 states have internal predecessors, (25), 5 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2023-11-24 23:53:53,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:53:53,138 INFO L93 Difference]: Finished difference Result 105 states and 129 transitions. [2023-11-24 23:53:53,138 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-24 23:53:53,139 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.125) internal successors, (25), 8 states have internal predecessors, (25), 5 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) Word has length 32 [2023-11-24 23:53:53,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:53:53,142 INFO L225 Difference]: With dead ends: 105 [2023-11-24 23:53:53,143 INFO L226 Difference]: Without dead ends: 93 [2023-11-24 23:53:53,144 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 195 ImplicationChecksByTransitivity, 23.0s TimeCoverageRelationStatistics Valid=114, Invalid=534, Unknown=2, NotChecked=0, Total=650 [2023-11-24 23:53:53,145 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 43 mSDsluCounter, 95 mSDsCounter, 0 mSdLazyCounter, 68 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 122 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 68 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-24 23:53:53,145 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [43 Valid, 122 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 68 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-24 23:53:53,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2023-11-24 23:53:53,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 87. [2023-11-24 23:53:53,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 47 states have (on average 1.1702127659574468) internal successors, (55), 51 states have internal predecessors, (55), 29 states have call successors, (29), 11 states have call predecessors, (29), 10 states have return successors, (25), 24 states have call predecessors, (25), 25 states have call successors, (25) [2023-11-24 23:53:53,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 109 transitions. [2023-11-24 23:53:53,167 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 109 transitions. Word has length 32 [2023-11-24 23:53:53,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:53:53,168 INFO L495 AbstractCegarLoop]: Abstraction has 87 states and 109 transitions. [2023-11-24 23:53:53,168 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 3.125) internal successors, (25), 8 states have internal predecessors, (25), 5 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2023-11-24 23:53:53,168 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 109 transitions. [2023-11-24 23:53:53,169 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2023-11-24 23:53:53,169 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:53:53,170 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:53:53,175 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d4b6c12-64be-4156-b759-b0a6a05b133f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-24 23:53:53,371 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d4b6c12-64be-4156-b759-b0a6a05b133f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-11-24 23:53:53,371 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:53:53,372 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:53:53,372 INFO L85 PathProgramCache]: Analyzing trace with hash -1126340141, now seen corresponding path program 1 times [2023-11-24 23:53:53,372 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:53:53,372 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1088277426] [2023-11-24 23:53:53,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:53:53,373 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:53:53,383 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-24 23:53:53,391 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [619289293] [2023-11-24 23:53:53,391 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:53:53,391 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:53:53,392 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d4b6c12-64be-4156-b759-b0a6a05b133f/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:53:53,393 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d4b6c12-64be-4156-b759-b0a6a05b133f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:53:53,431 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d4b6c12-64be-4156-b759-b0a6a05b133f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-24 23:53:53,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:53:53,511 INFO L262 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 20 conjunts are in the unsatisfiable core [2023-11-24 23:53:53,514 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:53:53,839 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2023-11-24 23:53:53,839 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:53:54,192 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2023-11-24 23:53:54,192 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:53:54,193 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1088277426] [2023-11-24 23:53:54,193 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-24 23:53:54,193 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [619289293] [2023-11-24 23:53:54,193 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [619289293] provided 1 perfect and 1 imperfect interpolant sequences [2023-11-24 23:53:54,194 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-24 23:53:54,194 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [7] total 10 [2023-11-24 23:53:54,194 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [391130223] [2023-11-24 23:53:54,195 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:53:54,195 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-24 23:53:54,195 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:53:54,196 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-24 23:53:54,197 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2023-11-24 23:53:54,197 INFO L87 Difference]: Start difference. First operand 87 states and 109 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, (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) [2023-11-24 23:53:54,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:53:54,293 INFO L93 Difference]: Finished difference Result 101 states and 122 transitions. [2023-11-24 23:53:54,294 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-24 23:53:54,295 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, (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 32 [2023-11-24 23:53:54,295 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:53:54,297 INFO L225 Difference]: With dead ends: 101 [2023-11-24 23:53:54,298 INFO L226 Difference]: Without dead ends: 99 [2023-11-24 23:53:54,298 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2023-11-24 23:53:54,300 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 8 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-24 23:53:54,300 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 75 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-24 23:53:54,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2023-11-24 23:53:54,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2023-11-24 23:53:54,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 56 states have (on average 1.1428571428571428) internal successors, (64), 60 states have internal predecessors, (64), 29 states have call successors, (29), 14 states have call predecessors, (29), 13 states have return successors, (25), 24 states have call predecessors, (25), 25 states have call successors, (25) [2023-11-24 23:53:54,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 118 transitions. [2023-11-24 23:53:54,349 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 118 transitions. Word has length 32 [2023-11-24 23:53:54,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:53:54,350 INFO L495 AbstractCegarLoop]: Abstraction has 99 states and 118 transitions. [2023-11-24 23:53:54,350 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, (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) [2023-11-24 23:53:54,350 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 118 transitions. [2023-11-24 23:53:54,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2023-11-24 23:53:54,351 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:53:54,352 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:53:54,363 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d4b6c12-64be-4156-b759-b0a6a05b133f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-24 23:53:54,557 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d4b6c12-64be-4156-b759-b0a6a05b133f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-11-24 23:53:54,558 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:53:54,558 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:53:54,558 INFO L85 PathProgramCache]: Analyzing trace with hash -2087905654, now seen corresponding path program 1 times [2023-11-24 23:53:54,558 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:53:54,558 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2010161547] [2023-11-24 23:53:54,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:53:54,559 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:53:54,567 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-24 23:53:54,568 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [418428583] [2023-11-24 23:53:54,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:53:54,568 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:53:54,568 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d4b6c12-64be-4156-b759-b0a6a05b133f/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:53:54,569 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d4b6c12-64be-4156-b759-b0a6a05b133f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:53:54,595 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d4b6c12-64be-4156-b759-b0a6a05b133f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-24 23:53:54,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:53:54,629 INFO L262 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 18 conjunts are in the unsatisfiable core [2023-11-24 23:53:54,635 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:53:54,763 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 15 proven. 5 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-11-24 23:53:54,764 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:53:54,959 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 15 proven. 5 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-11-24 23:53:54,959 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:53:54,959 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2010161547] [2023-11-24 23:53:54,959 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-24 23:53:54,960 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [418428583] [2023-11-24 23:53:54,960 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [418428583] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 23:53:54,960 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1654183807] [2023-11-24 23:53:54,963 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2023-11-24 23:53:54,965 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:53:54,966 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-24 23:53:54,966 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-24 23:53:54,966 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-24 23:53:55,605 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 36 for LOIs [2023-11-24 23:53:55,621 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 64 for LOIs [2023-11-24 23:53:55,662 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-24 23:53:57,242 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [1654183807] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:53:57,242 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-11-24 23:53:57,243 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [9, 8] total 23 [2023-11-24 23:53:57,243 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2098288139] [2023-11-24 23:53:57,243 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:53:57,244 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-11-24 23:53:57,244 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:53:57,245 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-11-24 23:53:57,245 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=424, Unknown=0, NotChecked=0, Total=506 [2023-11-24 23:53:57,246 INFO L87 Difference]: Start difference. First operand 99 states and 118 transitions. Second operand has 13 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 8 states have internal predecessors, (11), 4 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) [2023-11-24 23:53:57,610 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:53:57,611 INFO L93 Difference]: Finished difference Result 101 states and 119 transitions. [2023-11-24 23:53:57,611 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-11-24 23:53:57,611 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 8 states have internal predecessors, (11), 4 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 35 [2023-11-24 23:53:57,612 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:53:57,613 INFO L225 Difference]: With dead ends: 101 [2023-11-24 23:53:57,613 INFO L226 Difference]: Without dead ends: 91 [2023-11-24 23:53:57,614 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 79 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 155 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=82, Invalid=424, Unknown=0, NotChecked=0, Total=506 [2023-11-24 23:53:57,615 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 0 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 166 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 166 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 166 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-24 23:53:57,616 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 75 Invalid, 166 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 166 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-24 23:53:57,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2023-11-24 23:53:57,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2023-11-24 23:53:57,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 51 states have (on average 1.1372549019607843) internal successors, (58), 55 states have internal predecessors, (58), 27 states have call successors, (27), 12 states have call predecessors, (27), 12 states have return successors, (24), 23 states have call predecessors, (24), 24 states have call successors, (24) [2023-11-24 23:53:57,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 109 transitions. [2023-11-24 23:53:57,638 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 109 transitions. Word has length 35 [2023-11-24 23:53:57,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:53:57,638 INFO L495 AbstractCegarLoop]: Abstraction has 91 states and 109 transitions. [2023-11-24 23:53:57,638 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 8 states have internal predecessors, (11), 4 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) [2023-11-24 23:53:57,639 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 109 transitions. [2023-11-24 23:53:57,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2023-11-24 23:53:57,640 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:53:57,640 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:53:57,653 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d4b6c12-64be-4156-b759-b0a6a05b133f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-24 23:53:57,846 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d4b6c12-64be-4156-b759-b0a6a05b133f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2023-11-24 23:53:57,846 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:53:57,847 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:53:57,847 INFO L85 PathProgramCache]: Analyzing trace with hash 1860492319, now seen corresponding path program 2 times [2023-11-24 23:53:57,847 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:53:57,847 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1239707426] [2023-11-24 23:53:57,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:53:57,847 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:53:57,856 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-24 23:53:57,857 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1072307027] [2023-11-24 23:53:57,857 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-24 23:53:57,857 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:53:57,857 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d4b6c12-64be-4156-b759-b0a6a05b133f/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:53:57,859 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d4b6c12-64be-4156-b759-b0a6a05b133f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:53:57,879 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d4b6c12-64be-4156-b759-b0a6a05b133f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-24 23:53:57,933 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-24 23:53:57,933 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-24 23:53:57,935 INFO L262 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 24 conjunts are in the unsatisfiable core [2023-11-24 23:53:57,938 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:53:58,434 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-11-24 23:53:58,434 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:53:58,810 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 8 proven. 4 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-11-24 23:53:58,810 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:53:58,810 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1239707426] [2023-11-24 23:53:58,810 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-24 23:53:58,810 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1072307027] [2023-11-24 23:53:58,811 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1072307027] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 23:53:58,811 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1812194868] [2023-11-24 23:53:58,813 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-11-24 23:53:58,814 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:53:58,814 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-24 23:53:58,814 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-24 23:53:58,815 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-24 23:53:59,869 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2023-11-24 23:53:59,875 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 64 for LOIs [2023-11-24 23:53:59,898 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-24 23:54:19,794 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2561#(and (<= 1 |#StackHeapBarrier|) (<= 1 ~counter~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-11-24 23:54:19,794 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-24 23:54:19,794 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-24 23:54:19,795 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6] total 12 [2023-11-24 23:54:19,795 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [814229858] [2023-11-24 23:54:19,795 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-24 23:54:19,795 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-11-24 23:54:19,796 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:54:19,796 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-11-24 23:54:19,797 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=601, Unknown=3, NotChecked=0, Total=702 [2023-11-24 23:54:19,797 INFO L87 Difference]: Start difference. First operand 91 states and 109 transitions. Second operand has 12 states, 11 states have (on average 2.090909090909091) internal successors, (23), 9 states have internal predecessors, (23), 5 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (11), 6 states have call predecessors, (11), 5 states have call successors, (11) [2023-11-24 23:54:23,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:54:23,116 INFO L93 Difference]: Finished difference Result 101 states and 118 transitions. [2023-11-24 23:54:23,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-11-24 23:54:23,116 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.090909090909091) internal successors, (23), 9 states have internal predecessors, (23), 5 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (11), 6 states have call predecessors, (11), 5 states have call successors, (11) Word has length 37 [2023-11-24 23:54:23,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:54:23,118 INFO L225 Difference]: With dead ends: 101 [2023-11-24 23:54:23,118 INFO L226 Difference]: Without dead ends: 99 [2023-11-24 23:54:23,119 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 84 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 201 ImplicationChecksByTransitivity, 22.9s TimeCoverageRelationStatistics Valid=132, Invalid=795, Unknown=3, NotChecked=0, Total=930 [2023-11-24 23:54:23,120 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 25 mSDsluCounter, 119 mSDsCounter, 0 mSdLazyCounter, 115 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 144 SdHoareTripleChecker+Invalid, 151 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 115 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-24 23:54:23,120 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 144 Invalid, 151 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 115 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-24 23:54:23,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2023-11-24 23:54:23,143 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2023-11-24 23:54:23,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 57 states have (on average 1.1228070175438596) internal successors, (64), 61 states have internal predecessors, (64), 27 states have call successors, (27), 14 states have call predecessors, (27), 14 states have return successors, (24), 23 states have call predecessors, (24), 24 states have call successors, (24) [2023-11-24 23:54:23,145 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 115 transitions. [2023-11-24 23:54:23,146 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 115 transitions. Word has length 37 [2023-11-24 23:54:23,146 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:54:23,146 INFO L495 AbstractCegarLoop]: Abstraction has 99 states and 115 transitions. [2023-11-24 23:54:23,147 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 2.090909090909091) internal successors, (23), 9 states have internal predecessors, (23), 5 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (11), 6 states have call predecessors, (11), 5 states have call successors, (11) [2023-11-24 23:54:23,147 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 115 transitions. [2023-11-24 23:54:23,148 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2023-11-24 23:54:23,148 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:54:23,149 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:54:23,155 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d4b6c12-64be-4156-b759-b0a6a05b133f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-24 23:54:23,354 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d4b6c12-64be-4156-b759-b0a6a05b133f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2023-11-24 23:54:23,355 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:54:23,355 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:54:23,355 INFO L85 PathProgramCache]: Analyzing trace with hash -209579757, now seen corresponding path program 3 times [2023-11-24 23:54:23,355 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:54:23,355 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1958499954] [2023-11-24 23:54:23,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:54:23,356 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:54:23,364 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-24 23:54:23,364 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [320942782] [2023-11-24 23:54:23,364 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-24 23:54:23,364 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:54:23,365 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d4b6c12-64be-4156-b759-b0a6a05b133f/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:54:23,366 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d4b6c12-64be-4156-b759-b0a6a05b133f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:54:23,373 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d4b6c12-64be-4156-b759-b0a6a05b133f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-24 23:54:23,419 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-24 23:54:23,419 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-24 23:54:23,420 INFO L262 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 29 conjunts are in the unsatisfiable core [2023-11-24 23:54:23,423 INFO L285 TraceCheckSpWp]: Computing forward predicates...