./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/fermat1-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_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/config/AutomizerReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/fermat1-ll_unwindbound50.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya --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 Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash ca2134f8a32f49a0943527ee47fd89b4eb01286294fd09a8197c7c707de74c1d --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-11-29 00:44:28,824 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-29 00:44:28,892 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/config/svcomp-Reach-32bit-Automizer_Default.epf [2023-11-29 00:44:28,896 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-29 00:44:28,897 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-29 00:44:28,919 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-29 00:44:28,919 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-29 00:44:28,920 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-29 00:44:28,921 INFO L151 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2023-11-29 00:44:28,921 INFO L153 SettingsManager]: * Use memory slicer=true [2023-11-29 00:44:28,922 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-29 00:44:28,922 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-29 00:44:28,923 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-29 00:44:28,923 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-29 00:44:28,924 INFO L153 SettingsManager]: * Use SBE=true [2023-11-29 00:44:28,924 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-29 00:44:28,925 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-29 00:44:28,925 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-29 00:44:28,926 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-29 00:44:28,926 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-29 00:44:28,927 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-29 00:44:28,929 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-29 00:44:28,930 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-29 00:44:28,930 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-29 00:44:28,930 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-29 00:44:28,931 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-29 00:44:28,931 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-29 00:44:28,932 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-29 00:44:28,932 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-11-29 00:44:28,932 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-29 00:44:28,933 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-29 00:44:28,933 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2023-11-29 00:44:28,933 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-29 00:44:28,934 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-29 00:44:28,934 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-29 00:44:28,935 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2023-11-29 00:44:28,935 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-29 00:44:28,936 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-29 00:44:28,936 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-11-29 00:44:28,936 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-29 00:44:28,937 INFO L153 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2023-11-29 00:44:28,937 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-29 00:44:28,937 INFO L153 SettingsManager]: * Looper check in Petri net analysis=SEMANTIC 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_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> ca2134f8a32f49a0943527ee47fd89b4eb01286294fd09a8197c7c707de74c1d [2023-11-29 00:44:29,172 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-29 00:44:29,191 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-29 00:44:29,193 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-29 00:44:29,194 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-29 00:44:29,194 INFO L274 PluginConnector]: CDTParser initialized [2023-11-29 00:44:29,195 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/../../sv-benchmarks/c/nla-digbench-scaling/fermat1-ll_unwindbound50.c [2023-11-29 00:44:31,919 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-29 00:44:32,084 INFO L384 CDTParser]: Found 1 translation units. [2023-11-29 00:44:32,084 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/sv-benchmarks/c/nla-digbench-scaling/fermat1-ll_unwindbound50.c [2023-11-29 00:44:32,092 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/data/3bd027b68/468406119297402a8441f8dc74b04eb3/FLAGd036eddbf [2023-11-29 00:44:32,106 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/data/3bd027b68/468406119297402a8441f8dc74b04eb3 [2023-11-29 00:44:32,109 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-29 00:44:32,110 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-29 00:44:32,111 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-29 00:44:32,112 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-29 00:44:32,116 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-29 00:44:32,117 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 29.11 12:44:32" (1/1) ... [2023-11-29 00:44:32,118 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@389a3b66 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 12:44:32, skipping insertion in model container [2023-11-29 00:44:32,118 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 29.11 12:44:32" (1/1) ... [2023-11-29 00:44:32,140 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-29 00:44:32,279 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_ab9bfcd8-bf10-4392-be34-66f0e190a733/sv-benchmarks/c/nla-digbench-scaling/fermat1-ll_unwindbound50.c[535,548] [2023-11-29 00:44:32,297 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-29 00:44:32,305 INFO L202 MainTranslator]: Completed pre-run [2023-11-29 00:44:32,316 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_ab9bfcd8-bf10-4392-be34-66f0e190a733/sv-benchmarks/c/nla-digbench-scaling/fermat1-ll_unwindbound50.c[535,548] [2023-11-29 00:44:32,326 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-29 00:44:32,337 INFO L206 MainTranslator]: Completed translation [2023-11-29 00:44:32,337 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 12:44:32 WrapperNode [2023-11-29 00:44:32,337 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-29 00:44:32,338 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-29 00:44:32,339 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-29 00:44:32,339 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-29 00:44:32,345 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 12:44:32" (1/1) ... [2023-11-29 00:44:32,351 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 12:44:32" (1/1) ... [2023-11-29 00:44:32,366 INFO L138 Inliner]: procedures = 14, calls = 13, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 68 [2023-11-29 00:44:32,367 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-29 00:44:32,367 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-29 00:44:32,367 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-29 00:44:32,367 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-29 00:44:32,375 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 12:44:32" (1/1) ... [2023-11-29 00:44:32,376 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 12:44:32" (1/1) ... [2023-11-29 00:44:32,377 INFO L184 PluginConnector]: Executing the observer MemorySlicer from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 12:44:32" (1/1) ... [2023-11-29 00:44:32,386 INFO L175 MemorySlicer]: Split 2 memory accesses to 1 slices as follows [2]. 100 percent of accesses are in the largest equivalence class. The 2 initializations are split as follows [2]. The 0 writes are split as follows [0]. [2023-11-29 00:44:32,386 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 12:44:32" (1/1) ... [2023-11-29 00:44:32,386 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 12:44:32" (1/1) ... [2023-11-29 00:44:32,390 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 12:44:32" (1/1) ... [2023-11-29 00:44:32,393 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 12:44:32" (1/1) ... [2023-11-29 00:44:32,394 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 12:44:32" (1/1) ... [2023-11-29 00:44:32,395 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 12:44:32" (1/1) ... [2023-11-29 00:44:32,396 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-29 00:44:32,397 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-29 00:44:32,398 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-29 00:44:32,398 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-29 00:44:32,398 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 12:44:32" (1/1) ... [2023-11-29 00:44:32,403 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2023-11-29 00:44:32,414 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 [2023-11-29 00:44:32,425 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 (exit command is (exit), workingDir is null) [2023-11-29 00:44:32,441 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 (1)] Waiting until timeout for monitored process [2023-11-29 00:44:32,460 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-29 00:44:32,460 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-11-29 00:44:32,461 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-11-29 00:44:32,461 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#0 [2023-11-29 00:44:32,461 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-29 00:44:32,461 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-29 00:44:32,461 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-11-29 00:44:32,461 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-11-29 00:44:32,530 INFO L241 CfgBuilder]: Building ICFG [2023-11-29 00:44:32,533 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-29 00:44:32,697 INFO L282 CfgBuilder]: Performing block encoding [2023-11-29 00:44:32,719 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-29 00:44:32,719 INFO L309 CfgBuilder]: Removed 3 assume(true) statements. [2023-11-29 00:44:32,720 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 29.11 12:44:32 BoogieIcfgContainer [2023-11-29 00:44:32,720 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-29 00:44:32,723 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-29 00:44:32,723 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-29 00:44:32,725 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-29 00:44:32,726 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 29.11 12:44:32" (1/3) ... [2023-11-29 00:44:32,726 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1f13880a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 29.11 12:44:32, skipping insertion in model container [2023-11-29 00:44:32,727 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 12:44:32" (2/3) ... [2023-11-29 00:44:32,727 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1f13880a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 29.11 12:44:32, skipping insertion in model container [2023-11-29 00:44:32,727 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 29.11 12:44:32" (3/3) ... [2023-11-29 00:44:32,728 INFO L112 eAbstractionObserver]: Analyzing ICFG fermat1-ll_unwindbound50.c [2023-11-29 00:44:32,743 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-29 00:44:32,743 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-29 00:44:32,784 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-29 00:44:32,790 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=PETRI_NET, 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;@3a6a6063, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-29 00:44:32,790 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-29 00:44:32,794 INFO L276 IsEmpty]: Start isEmpty. Operand has 29 states, 19 states have (on average 1.631578947368421) internal successors, (31), 20 states have internal predecessors, (31), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-11-29 00:44:32,800 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-11-29 00:44:32,800 INFO L187 NwaCegarLoop]: Found error trace [2023-11-29 00:44:32,801 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-29 00:44:32,802 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-29 00:44:32,806 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-29 00:44:32,806 INFO L85 PathProgramCache]: Analyzing trace with hash -1287337846, now seen corresponding path program 1 times [2023-11-29 00:44:32,813 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-29 00:44:32,813 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1645192552] [2023-11-29 00:44:32,814 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-29 00:44:32,814 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-29 00:44:32,889 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-29 00:44:32,889 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1576053679] [2023-11-29 00:44:32,889 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-29 00:44:32,890 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-29 00:44:32,890 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 [2023-11-29 00:44:32,891 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-29 00:44:32,899 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-29 00:44:32,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-29 00:44:32,966 INFO L262 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 1 conjunts are in the unsatisfiable core [2023-11-29 00:44:32,971 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-29 00:44:32,989 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-29 00:44:32,989 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-29 00:44:32,989 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-29 00:44:32,990 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1645192552] [2023-11-29 00:44:32,990 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-29 00:44:32,990 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1576053679] [2023-11-29 00:44:32,990 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1576053679] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-29 00:44:32,991 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-29 00:44:32,992 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-29 00:44:32,994 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1375402306] [2023-11-29 00:44:32,994 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-29 00:44:32,998 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-11-29 00:44:32,998 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-29 00:44:33,022 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-11-29 00:44:33,022 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-11-29 00:44:33,024 INFO L87 Difference]: Start difference. First operand has 29 states, 19 states have (on average 1.631578947368421) internal successors, (31), 20 states have internal predecessors, (31), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Second operand has 2 states, 2 states have (on average 5.5) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-29 00:44:33,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-29 00:44:33,049 INFO L93 Difference]: Finished difference Result 56 states and 89 transitions. [2023-11-29 00:44:33,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-11-29 00:44:33,051 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 5.5) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 17 [2023-11-29 00:44:33,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-29 00:44:33,059 INFO L225 Difference]: With dead ends: 56 [2023-11-29 00:44:33,059 INFO L226 Difference]: Without dead ends: 27 [2023-11-29 00:44:33,062 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-11-29 00:44:33,065 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 2 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 2 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 2 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-29 00:44:33,066 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 36 Invalid, 2 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 2 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-29 00:44:33,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2023-11-29 00:44:33,097 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2023-11-29 00:44:33,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 19 states have internal predecessors, (25), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2023-11-29 00:44:33,099 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 36 transitions. [2023-11-29 00:44:33,100 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 36 transitions. Word has length 17 [2023-11-29 00:44:33,100 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-29 00:44:33,101 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 36 transitions. [2023-11-29 00:44:33,101 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 5.5) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-29 00:44:33,101 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 36 transitions. [2023-11-29 00:44:33,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-11-29 00:44:33,102 INFO L187 NwaCegarLoop]: Found error trace [2023-11-29 00:44:33,102 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-29 00:44:33,108 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-29 00:44:33,303 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2023-11-29 00:44:33,303 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-29 00:44:33,304 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-29 00:44:33,304 INFO L85 PathProgramCache]: Analyzing trace with hash -138178001, now seen corresponding path program 1 times [2023-11-29 00:44:33,304 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-29 00:44:33,304 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1119361619] [2023-11-29 00:44:33,305 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-29 00:44:33,305 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-29 00:44:33,318 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-29 00:44:33,319 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [245337158] [2023-11-29 00:44:33,319 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-29 00:44:33,319 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-29 00:44:33,319 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 [2023-11-29 00:44:33,320 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-29 00:44:33,322 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-29 00:44:33,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-29 00:44:33,379 INFO L262 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-29 00:44:33,381 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-29 00:44:33,444 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-29 00:44:33,444 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-29 00:44:33,445 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-29 00:44:33,445 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1119361619] [2023-11-29 00:44:33,445 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-29 00:44:33,445 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [245337158] [2023-11-29 00:44:33,445 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [245337158] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-29 00:44:33,446 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-29 00:44:33,446 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-29 00:44:33,446 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [380098124] [2023-11-29 00:44:33,446 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-29 00:44:33,447 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-29 00:44:33,447 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-29 00:44:33,448 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-29 00:44:33,448 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-29 00:44:33,449 INFO L87 Difference]: Start difference. First operand 27 states and 36 transitions. Second operand has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 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) [2023-11-29 00:44:33,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-29 00:44:33,471 INFO L93 Difference]: Finished difference Result 36 states and 45 transitions. [2023-11-29 00:44:33,472 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-29 00:44:33,472 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 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 18 [2023-11-29 00:44:33,472 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-29 00:44:33,473 INFO L225 Difference]: With dead ends: 36 [2023-11-29 00:44:33,473 INFO L226 Difference]: Without dead ends: 29 [2023-11-29 00:44:33,474 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-29 00:44:33,475 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 0 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-29 00:44:33,476 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 88 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-29 00:44:33,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2023-11-29 00:44:33,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2023-11-29 00:44:33,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 20 states have (on average 1.35) internal successors, (27), 21 states have internal predecessors, (27), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2023-11-29 00:44:33,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 38 transitions. [2023-11-29 00:44:33,484 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 38 transitions. Word has length 18 [2023-11-29 00:44:33,485 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-29 00:44:33,486 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 38 transitions. [2023-11-29 00:44:33,486 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 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) [2023-11-29 00:44:33,486 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 38 transitions. [2023-11-29 00:44:33,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-11-29 00:44:33,487 INFO L187 NwaCegarLoop]: Found error trace [2023-11-29 00:44:33,487 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-29 00:44:33,493 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-11-29 00:44:33,691 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-29 00:44:33,691 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-29 00:44:33,692 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-29 00:44:33,692 INFO L85 PathProgramCache]: Analyzing trace with hash -136509705, now seen corresponding path program 1 times [2023-11-29 00:44:33,692 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-29 00:44:33,692 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1078349139] [2023-11-29 00:44:33,692 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-29 00:44:33,693 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-29 00:44:33,704 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-29 00:44:33,704 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [3568404] [2023-11-29 00:44:33,704 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-29 00:44:33,704 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-29 00:44:33,704 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 [2023-11-29 00:44:33,705 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-29 00:44:33,706 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-29 00:44:33,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-29 00:44:33,760 INFO L262 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 12 conjunts are in the unsatisfiable core [2023-11-29 00:44:33,762 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-29 00:44:33,955 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-29 00:44:33,955 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-29 00:44:33,956 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-29 00:44:33,956 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1078349139] [2023-11-29 00:44:33,956 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-29 00:44:33,956 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [3568404] [2023-11-29 00:44:33,957 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [3568404] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-29 00:44:33,957 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-29 00:44:33,957 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-29 00:44:33,957 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1905440465] [2023-11-29 00:44:33,957 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-29 00:44:33,958 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-29 00:44:33,958 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-29 00:44:33,959 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-29 00:44:33,959 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-29 00:44:33,959 INFO L87 Difference]: Start difference. First operand 29 states and 38 transitions. Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 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) [2023-11-29 00:44:36,940 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.94s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-11-29 00:44:37,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-29 00:44:37,922 INFO L93 Difference]: Finished difference Result 48 states and 65 transitions. [2023-11-29 00:44:37,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-29 00:44:37,922 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 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 18 [2023-11-29 00:44:37,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-29 00:44:37,924 INFO L225 Difference]: With dead ends: 48 [2023-11-29 00:44:37,924 INFO L226 Difference]: Without dead ends: 46 [2023-11-29 00:44:37,924 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-29 00:44:37,926 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 16 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 94 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.9s IncrementalHoareTripleChecker+Time [2023-11-29 00:44:37,926 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 94 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 3.9s Time] [2023-11-29 00:44:37,927 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2023-11-29 00:44:37,938 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2023-11-29 00:44:37,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 32 states have (on average 1.40625) internal successors, (45), 33 states have internal predecessors, (45), 9 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2023-11-29 00:44:37,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 62 transitions. [2023-11-29 00:44:37,940 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 62 transitions. Word has length 18 [2023-11-29 00:44:37,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-29 00:44:37,941 INFO L495 AbstractCegarLoop]: Abstraction has 45 states and 62 transitions. [2023-11-29 00:44:37,941 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 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) [2023-11-29 00:44:37,941 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 62 transitions. [2023-11-29 00:44:37,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-11-29 00:44:37,942 INFO L187 NwaCegarLoop]: Found error trace [2023-11-29 00:44:37,942 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-29 00:44:37,947 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-11-29 00:44:38,142 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2023-11-29 00:44:38,143 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-29 00:44:38,143 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-29 00:44:38,143 INFO L85 PathProgramCache]: Analyzing trace with hash -99991460, now seen corresponding path program 1 times [2023-11-29 00:44:38,143 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-29 00:44:38,144 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1693930463] [2023-11-29 00:44:38,144 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-29 00:44:38,144 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-29 00:44:38,153 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-29 00:44:38,153 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1818116131] [2023-11-29 00:44:38,153 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-29 00:44:38,153 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-29 00:44:38,153 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 [2023-11-29 00:44:38,154 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-29 00:44:38,155 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-29 00:44:38,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-29 00:44:38,197 INFO L262 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 13 conjunts are in the unsatisfiable core [2023-11-29 00:44:38,199 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-29 00:44:38,276 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-29 00:44:38,276 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-29 00:44:38,394 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-29 00:44:38,394 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-29 00:44:38,394 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1693930463] [2023-11-29 00:44:38,395 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-29 00:44:38,395 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1818116131] [2023-11-29 00:44:38,395 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1818116131] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-29 00:44:38,395 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-29 00:44:38,395 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 11 [2023-11-29 00:44:38,396 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [781382695] [2023-11-29 00:44:38,396 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-29 00:44:38,396 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-11-29 00:44:38,397 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-29 00:44:38,397 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-11-29 00:44:38,398 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2023-11-29 00:44:38,398 INFO L87 Difference]: Start difference. First operand 45 states and 62 transitions. Second operand has 11 states, 10 states have (on average 1.9) internal successors, (19), 8 states have internal predecessors, (19), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) [2023-11-29 00:44:38,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-29 00:44:38,550 INFO L93 Difference]: Finished difference Result 52 states and 68 transitions. [2023-11-29 00:44:38,551 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-29 00:44:38,551 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 1.9) internal successors, (19), 8 states have internal predecessors, (19), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) Word has length 24 [2023-11-29 00:44:38,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-29 00:44:38,552 INFO L225 Difference]: With dead ends: 52 [2023-11-29 00:44:38,553 INFO L226 Difference]: Without dead ends: 47 [2023-11-29 00:44:38,553 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2023-11-29 00:44:38,554 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 38 mSDsluCounter, 120 mSDsCounter, 0 mSdLazyCounter, 90 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 143 SdHoareTripleChecker+Invalid, 105 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 90 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-29 00:44:38,555 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [40 Valid, 143 Invalid, 105 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 90 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-29 00:44:38,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2023-11-29 00:44:38,568 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 31. [2023-11-29 00:44:38,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 22 states have (on average 1.2272727272727273) internal successors, (27), 22 states have internal predecessors, (27), 6 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2023-11-29 00:44:38,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 38 transitions. [2023-11-29 00:44:38,569 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 38 transitions. Word has length 24 [2023-11-29 00:44:38,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-29 00:44:38,570 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 38 transitions. [2023-11-29 00:44:38,570 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 1.9) internal successors, (19), 8 states have internal predecessors, (19), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) [2023-11-29 00:44:38,570 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 38 transitions. [2023-11-29 00:44:38,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2023-11-29 00:44:38,571 INFO L187 NwaCegarLoop]: Found error trace [2023-11-29 00:44:38,572 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-29 00:44:38,576 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-11-29 00:44:38,772 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-29 00:44:38,772 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-29 00:44:38,773 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-29 00:44:38,773 INFO L85 PathProgramCache]: Analyzing trace with hash -1981880857, now seen corresponding path program 1 times [2023-11-29 00:44:38,773 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-29 00:44:38,773 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [569806164] [2023-11-29 00:44:38,773 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-29 00:44:38,773 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-29 00:44:38,783 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-29 00:44:38,783 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [164580369] [2023-11-29 00:44:38,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-29 00:44:38,783 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-29 00:44:38,783 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 [2023-11-29 00:44:38,784 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-29 00:44:38,786 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-29 00:44:38,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-29 00:44:38,835 INFO L262 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-29 00:44:38,837 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-29 00:44:38,882 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-29 00:44:38,882 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-29 00:44:38,883 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-29 00:44:38,883 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [569806164] [2023-11-29 00:44:38,883 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-29 00:44:38,883 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [164580369] [2023-11-29 00:44:38,883 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [164580369] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-29 00:44:38,883 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-29 00:44:38,883 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-29 00:44:38,884 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [968731134] [2023-11-29 00:44:38,884 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-29 00:44:38,884 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-29 00:44:38,884 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-29 00:44:38,885 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-29 00:44:38,885 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-29 00:44:38,885 INFO L87 Difference]: Start difference. First operand 31 states and 38 transitions. Second operand has 5 states, 5 states have (on average 4.0) internal successors, (20), 4 states have internal predecessors, (20), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-29 00:44:38,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-29 00:44:38,923 INFO L93 Difference]: Finished difference Result 60 states and 74 transitions. [2023-11-29 00:44:38,923 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-29 00:44:38,923 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.0) internal successors, (20), 4 states have internal predecessors, (20), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 30 [2023-11-29 00:44:38,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-29 00:44:38,924 INFO L225 Difference]: With dead ends: 60 [2023-11-29 00:44:38,925 INFO L226 Difference]: Without dead ends: 39 [2023-11-29 00:44:38,925 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-29 00:44:38,926 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 0 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-29 00:44:38,927 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 88 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-29 00:44:38,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2023-11-29 00:44:38,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2023-11-29 00:44:38,944 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 28 states have (on average 1.1785714285714286) internal successors, (33), 28 states have internal predecessors, (33), 7 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-11-29 00:44:38,945 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 46 transitions. [2023-11-29 00:44:38,945 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 46 transitions. Word has length 30 [2023-11-29 00:44:38,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-29 00:44:38,945 INFO L495 AbstractCegarLoop]: Abstraction has 39 states and 46 transitions. [2023-11-29 00:44:38,946 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.0) internal successors, (20), 4 states have internal predecessors, (20), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-29 00:44:38,946 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 46 transitions. [2023-11-29 00:44:38,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2023-11-29 00:44:38,947 INFO L187 NwaCegarLoop]: Found error trace [2023-11-29 00:44:38,947 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-29 00:44:38,953 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-11-29 00:44:39,151 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-29 00:44:39,151 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-29 00:44:39,152 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-29 00:44:39,152 INFO L85 PathProgramCache]: Analyzing trace with hash 2089520544, now seen corresponding path program 1 times [2023-11-29 00:44:39,152 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-29 00:44:39,152 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1428032334] [2023-11-29 00:44:39,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-29 00:44:39,152 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-29 00:44:39,162 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-29 00:44:39,162 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1294484603] [2023-11-29 00:44:39,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-29 00:44:39,162 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-29 00:44:39,162 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 [2023-11-29 00:44:39,163 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-29 00:44:39,164 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-29 00:44:39,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-29 00:44:39,212 INFO L262 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 7 conjunts are in the unsatisfiable core [2023-11-29 00:44:39,215 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-29 00:44:39,296 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-29 00:44:39,296 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-29 00:44:39,368 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-29 00:44:39,368 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-29 00:44:39,368 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1428032334] [2023-11-29 00:44:39,368 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-29 00:44:39,369 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1294484603] [2023-11-29 00:44:39,369 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1294484603] provided 1 perfect and 1 imperfect interpolant sequences [2023-11-29 00:44:39,369 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-29 00:44:39,369 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5] total 10 [2023-11-29 00:44:39,369 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [205015550] [2023-11-29 00:44:39,369 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-29 00:44:39,370 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-29 00:44:39,370 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-29 00:44:39,370 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-29 00:44:39,371 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2023-11-29 00:44:39,371 INFO L87 Difference]: Start difference. First operand 39 states and 46 transitions. Second operand has 6 states, 6 states have (on average 3.5) internal successors, (21), 6 states have internal predecessors, (21), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2023-11-29 00:44:39,421 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-29 00:44:39,421 INFO L93 Difference]: Finished difference Result 69 states and 84 transitions. [2023-11-29 00:44:39,421 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-29 00:44:39,422 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 6 states have internal predecessors, (21), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 36 [2023-11-29 00:44:39,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-29 00:44:39,423 INFO L225 Difference]: With dead ends: 69 [2023-11-29 00:44:39,423 INFO L226 Difference]: Without dead ends: 48 [2023-11-29 00:44:39,423 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2023-11-29 00:44:39,424 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 17 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 105 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-29 00:44:39,425 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 105 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-29 00:44:39,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2023-11-29 00:44:39,441 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2023-11-29 00:44:39,442 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 34 states have (on average 1.1764705882352942) internal successors, (40), 34 states have internal predecessors, (40), 8 states have call successors, (8), 5 states have call predecessors, (8), 4 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2023-11-29 00:44:39,442 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 55 transitions. [2023-11-29 00:44:39,443 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 55 transitions. Word has length 36 [2023-11-29 00:44:39,443 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-29 00:44:39,443 INFO L495 AbstractCegarLoop]: Abstraction has 47 states and 55 transitions. [2023-11-29 00:44:39,443 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 6 states have internal predecessors, (21), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2023-11-29 00:44:39,443 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 55 transitions. [2023-11-29 00:44:39,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2023-11-29 00:44:39,445 INFO L187 NwaCegarLoop]: Found error trace [2023-11-29 00:44:39,445 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-29 00:44:39,450 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-11-29 00:44:39,645 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-29 00:44:39,646 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-29 00:44:39,646 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-29 00:44:39,646 INFO L85 PathProgramCache]: Analyzing trace with hash 1409797157, now seen corresponding path program 1 times [2023-11-29 00:44:39,646 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-29 00:44:39,646 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [844024846] [2023-11-29 00:44:39,646 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-29 00:44:39,646 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-29 00:44:39,654 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-29 00:44:39,654 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1554080955] [2023-11-29 00:44:39,655 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-29 00:44:39,655 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-29 00:44:39,655 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 [2023-11-29 00:44:39,656 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-29 00:44:39,657 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-29 00:44:39,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-29 00:44:39,703 INFO L262 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 7 conjunts are in the unsatisfiable core [2023-11-29 00:44:39,705 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-29 00:44:39,766 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-29 00:44:39,766 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-29 00:44:39,845 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-29 00:44:39,845 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-29 00:44:39,845 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [844024846] [2023-11-29 00:44:39,845 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-29 00:44:39,845 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1554080955] [2023-11-29 00:44:39,846 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1554080955] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-29 00:44:39,846 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-29 00:44:39,846 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6] total 10 [2023-11-29 00:44:39,846 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1992468554] [2023-11-29 00:44:39,846 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-29 00:44:39,847 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-11-29 00:44:39,847 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-29 00:44:39,847 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-11-29 00:44:39,847 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2023-11-29 00:44:39,848 INFO L87 Difference]: Start difference. First operand 47 states and 55 transitions. Second operand has 10 states, 10 states have (on average 4.2) internal successors, (42), 10 states have internal predecessors, (42), 7 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) [2023-11-29 00:44:40,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-29 00:44:40,016 INFO L93 Difference]: Finished difference Result 124 states and 155 transitions. [2023-11-29 00:44:40,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-11-29 00:44:40,017 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 4.2) internal successors, (42), 10 states have internal predecessors, (42), 7 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) Word has length 38 [2023-11-29 00:44:40,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-29 00:44:40,018 INFO L225 Difference]: With dead ends: 124 [2023-11-29 00:44:40,018 INFO L226 Difference]: Without dead ends: 103 [2023-11-29 00:44:40,019 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=119, Unknown=0, NotChecked=0, Total=182 [2023-11-29 00:44:40,020 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 62 mSDsluCounter, 117 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 62 SdHoareTripleChecker+Valid, 147 SdHoareTripleChecker+Invalid, 77 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-29 00:44:40,020 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [62 Valid, 147 Invalid, 77 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-29 00:44:40,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2023-11-29 00:44:40,054 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 90. [2023-11-29 00:44:40,054 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 66 states have (on average 1.2272727272727273) internal successors, (81), 67 states have internal predecessors, (81), 16 states have call successors, (16), 8 states have call predecessors, (16), 7 states have return successors, (15), 14 states have call predecessors, (15), 15 states have call successors, (15) [2023-11-29 00:44:40,055 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 112 transitions. [2023-11-29 00:44:40,056 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 112 transitions. Word has length 38 [2023-11-29 00:44:40,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-29 00:44:40,056 INFO L495 AbstractCegarLoop]: Abstraction has 90 states and 112 transitions. [2023-11-29 00:44:40,056 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 4.2) internal successors, (42), 10 states have internal predecessors, (42), 7 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) [2023-11-29 00:44:40,056 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 112 transitions. [2023-11-29 00:44:40,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2023-11-29 00:44:40,058 INFO L187 NwaCegarLoop]: Found error trace [2023-11-29 00:44:40,058 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-29 00:44:40,064 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2023-11-29 00:44:40,263 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-29 00:44:40,264 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-29 00:44:40,264 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-29 00:44:40,264 INFO L85 PathProgramCache]: Analyzing trace with hash -1072156249, now seen corresponding path program 1 times [2023-11-29 00:44:40,264 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-29 00:44:40,264 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [859652828] [2023-11-29 00:44:40,264 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-29 00:44:40,264 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-29 00:44:40,273 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-29 00:44:40,274 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [463849098] [2023-11-29 00:44:40,274 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-29 00:44:40,274 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-29 00:44:40,274 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 [2023-11-29 00:44:40,275 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-29 00:44:40,276 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-29 00:44:40,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-29 00:44:40,323 INFO L262 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-29 00:44:40,325 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-29 00:44:40,357 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-11-29 00:44:40,357 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-29 00:44:40,357 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-29 00:44:40,357 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [859652828] [2023-11-29 00:44:40,358 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-29 00:44:40,358 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [463849098] [2023-11-29 00:44:40,358 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [463849098] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-29 00:44:40,358 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-29 00:44:40,358 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-29 00:44:40,358 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1851187550] [2023-11-29 00:44:40,358 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-29 00:44:40,359 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-29 00:44:40,359 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-29 00:44:40,359 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-29 00:44:40,359 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-29 00:44:40,360 INFO L87 Difference]: Start difference. First operand 90 states and 112 transitions. Second operand has 4 states, 4 states have (on average 5.5) internal successors, (22), 4 states have internal predecessors, (22), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2023-11-29 00:44:40,429 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-29 00:44:40,430 INFO L93 Difference]: Finished difference Result 153 states and 197 transitions. [2023-11-29 00:44:40,430 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-29 00:44:40,430 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.5) internal successors, (22), 4 states have internal predecessors, (22), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 42 [2023-11-29 00:44:40,430 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-29 00:44:40,433 INFO L225 Difference]: With dead ends: 153 [2023-11-29 00:44:40,433 INFO L226 Difference]: Without dead ends: 114 [2023-11-29 00:44:40,434 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-29 00:44:40,435 INFO L413 NwaCegarLoop]: 45 mSDtfsCounter, 16 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 113 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-29 00:44:40,435 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 113 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-29 00:44:40,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2023-11-29 00:44:40,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 104. [2023-11-29 00:44:40,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 77 states have (on average 1.2337662337662338) internal successors, (95), 78 states have internal predecessors, (95), 19 states have call successors, (19), 8 states have call predecessors, (19), 7 states have return successors, (18), 17 states have call predecessors, (18), 18 states have call successors, (18) [2023-11-29 00:44:40,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 132 transitions. [2023-11-29 00:44:40,484 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 132 transitions. Word has length 42 [2023-11-29 00:44:40,485 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-29 00:44:40,485 INFO L495 AbstractCegarLoop]: Abstraction has 104 states and 132 transitions. [2023-11-29 00:44:40,485 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 5.5) internal successors, (22), 4 states have internal predecessors, (22), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2023-11-29 00:44:40,485 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 132 transitions. [2023-11-29 00:44:40,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2023-11-29 00:44:40,487 INFO L187 NwaCegarLoop]: Found error trace [2023-11-29 00:44:40,487 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-29 00:44:40,492 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2023-11-29 00:44:40,691 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-29 00:44:40,691 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-29 00:44:40,692 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-29 00:44:40,692 INFO L85 PathProgramCache]: Analyzing trace with hash 2142553388, now seen corresponding path program 1 times [2023-11-29 00:44:40,692 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-29 00:44:40,692 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [760865077] [2023-11-29 00:44:40,692 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-29 00:44:40,692 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-29 00:44:40,700 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-29 00:44:40,701 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1016118165] [2023-11-29 00:44:40,701 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-29 00:44:40,701 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-29 00:44:40,701 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 [2023-11-29 00:44:40,702 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-29 00:44:40,705 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-29 00:44:40,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-29 00:44:40,752 INFO L262 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 9 conjunts are in the unsatisfiable core [2023-11-29 00:44:40,755 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-29 00:44:40,830 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 8 proven. 14 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-29 00:44:40,831 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-29 00:44:40,913 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-11-29 00:44:40,913 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-29 00:44:40,913 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [760865077] [2023-11-29 00:44:40,913 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-29 00:44:40,913 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1016118165] [2023-11-29 00:44:40,913 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1016118165] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-29 00:44:40,913 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-29 00:44:40,913 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 12 [2023-11-29 00:44:40,914 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [919810918] [2023-11-29 00:44:40,914 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-29 00:44:40,914 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-11-29 00:44:40,914 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-29 00:44:40,915 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-11-29 00:44:40,915 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=82, Unknown=0, NotChecked=0, Total=132 [2023-11-29 00:44:40,916 INFO L87 Difference]: Start difference. First operand 104 states and 132 transitions. Second operand has 12 states, 12 states have (on average 4.083333333333333) internal successors, (49), 12 states have internal predecessors, (49), 9 states have call successors, (11), 6 states have call predecessors, (11), 5 states have return successors, (10), 8 states have call predecessors, (10), 8 states have call successors, (10) [2023-11-29 00:44:41,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-29 00:44:41,152 INFO L93 Difference]: Finished difference Result 214 states and 278 transitions. [2023-11-29 00:44:41,152 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-11-29 00:44:41,153 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 4.083333333333333) internal successors, (49), 12 states have internal predecessors, (49), 9 states have call successors, (11), 6 states have call predecessors, (11), 5 states have return successors, (10), 8 states have call predecessors, (10), 8 states have call successors, (10) Word has length 44 [2023-11-29 00:44:41,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-29 00:44:41,155 INFO L225 Difference]: With dead ends: 214 [2023-11-29 00:44:41,155 INFO L226 Difference]: Without dead ends: 167 [2023-11-29 00:44:41,156 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=92, Invalid=180, Unknown=0, NotChecked=0, Total=272 [2023-11-29 00:44:41,156 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 88 mSDsluCounter, 169 mSDsCounter, 0 mSdLazyCounter, 90 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 199 SdHoareTripleChecker+Invalid, 108 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 90 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-29 00:44:41,157 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [88 Valid, 199 Invalid, 108 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 90 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-29 00:44:41,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2023-11-29 00:44:41,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 148. [2023-11-29 00:44:41,204 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 148 states, 110 states have (on average 1.2454545454545454) internal successors, (137), 111 states have internal predecessors, (137), 28 states have call successors, (28), 10 states have call predecessors, (28), 9 states have return successors, (27), 26 states have call predecessors, (27), 27 states have call successors, (27) [2023-11-29 00:44:41,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 192 transitions. [2023-11-29 00:44:41,206 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 192 transitions. Word has length 44 [2023-11-29 00:44:41,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-29 00:44:41,207 INFO L495 AbstractCegarLoop]: Abstraction has 148 states and 192 transitions. [2023-11-29 00:44:41,207 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 4.083333333333333) internal successors, (49), 12 states have internal predecessors, (49), 9 states have call successors, (11), 6 states have call predecessors, (11), 5 states have return successors, (10), 8 states have call predecessors, (10), 8 states have call successors, (10) [2023-11-29 00:44:41,207 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 192 transitions. [2023-11-29 00:44:41,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2023-11-29 00:44:41,209 INFO L187 NwaCegarLoop]: Found error trace [2023-11-29 00:44:41,209 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-29 00:44:41,215 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-11-29 00:44:41,411 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-29 00:44:41,411 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-29 00:44:41,411 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-29 00:44:41,412 INFO L85 PathProgramCache]: Analyzing trace with hash 1696895027, now seen corresponding path program 1 times [2023-11-29 00:44:41,412 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-29 00:44:41,412 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1178671297] [2023-11-29 00:44:41,412 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-29 00:44:41,412 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-29 00:44:41,420 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-29 00:44:41,420 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1840931840] [2023-11-29 00:44:41,420 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-29 00:44:41,420 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-29 00:44:41,421 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 [2023-11-29 00:44:41,421 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-29 00:44:41,447 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-11-29 00:44:41,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-29 00:44:41,479 INFO L262 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 11 conjunts are in the unsatisfiable core [2023-11-29 00:44:41,481 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-29 00:44:41,598 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 8 proven. 30 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-29 00:44:41,598 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-29 00:44:41,702 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 8 proven. 6 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2023-11-29 00:44:41,702 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-29 00:44:41,702 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1178671297] [2023-11-29 00:44:41,702 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-29 00:44:41,702 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1840931840] [2023-11-29 00:44:41,702 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1840931840] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-29 00:44:41,702 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-29 00:44:41,703 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 14 [2023-11-29 00:44:41,703 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1305468650] [2023-11-29 00:44:41,703 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-29 00:44:41,704 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-11-29 00:44:41,704 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-29 00:44:41,705 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-11-29 00:44:41,705 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=111, Unknown=0, NotChecked=0, Total=182 [2023-11-29 00:44:41,705 INFO L87 Difference]: Start difference. First operand 148 states and 192 transitions. Second operand has 14 states, 14 states have (on average 4.0) internal successors, (56), 14 states have internal predecessors, (56), 11 states have call successors, (13), 7 states have call predecessors, (13), 6 states have return successors, (12), 10 states have call predecessors, (12), 10 states have call successors, (12) [2023-11-29 00:44:42,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-29 00:44:42,009 INFO L93 Difference]: Finished difference Result 206 states and 273 transitions. [2023-11-29 00:44:42,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2023-11-29 00:44:42,010 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 4.0) internal successors, (56), 14 states have internal predecessors, (56), 11 states have call successors, (13), 7 states have call predecessors, (13), 6 states have return successors, (12), 10 states have call predecessors, (12), 10 states have call successors, (12) Word has length 50 [2023-11-29 00:44:42,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-29 00:44:42,012 INFO L225 Difference]: With dead ends: 206 [2023-11-29 00:44:42,013 INFO L226 Difference]: Without dead ends: 201 [2023-11-29 00:44:42,013 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=130, Invalid=250, Unknown=0, NotChecked=0, Total=380 [2023-11-29 00:44:42,014 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 116 mSDsluCounter, 201 mSDsCounter, 0 mSdLazyCounter, 109 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 116 SdHoareTripleChecker+Valid, 231 SdHoareTripleChecker+Invalid, 140 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 109 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-29 00:44:42,014 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [116 Valid, 231 Invalid, 140 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 109 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-29 00:44:42,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2023-11-29 00:44:42,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 193. [2023-11-29 00:44:42,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 193 states, 143 states have (on average 1.2377622377622377) internal successors, (177), 147 states have internal predecessors, (177), 38 states have call successors, (38), 12 states have call predecessors, (38), 11 states have return successors, (37), 33 states have call predecessors, (37), 37 states have call successors, (37) [2023-11-29 00:44:42,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 252 transitions. [2023-11-29 00:44:42,075 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 252 transitions. Word has length 50 [2023-11-29 00:44:42,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-29 00:44:42,075 INFO L495 AbstractCegarLoop]: Abstraction has 193 states and 252 transitions. [2023-11-29 00:44:42,075 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 4.0) internal successors, (56), 14 states have internal predecessors, (56), 11 states have call successors, (13), 7 states have call predecessors, (13), 6 states have return successors, (12), 10 states have call predecessors, (12), 10 states have call successors, (12) [2023-11-29 00:44:42,076 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 252 transitions. [2023-11-29 00:44:42,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2023-11-29 00:44:42,079 INFO L187 NwaCegarLoop]: Found error trace [2023-11-29 00:44:42,079 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 5, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-29 00:44:42,084 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2023-11-29 00:44:42,283 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-11-29 00:44:42,283 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-29 00:44:42,283 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-29 00:44:42,283 INFO L85 PathProgramCache]: Analyzing trace with hash -1904373439, now seen corresponding path program 1 times [2023-11-29 00:44:42,284 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-29 00:44:42,284 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [257401918] [2023-11-29 00:44:42,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-29 00:44:42,284 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-29 00:44:42,296 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-29 00:44:42,296 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [22936622] [2023-11-29 00:44:42,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-29 00:44:42,296 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-29 00:44:42,296 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 [2023-11-29 00:44:42,297 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-29 00:44:42,298 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-11-29 00:44:42,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-29 00:44:42,369 INFO L262 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-29 00:44:42,371 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-29 00:44:42,426 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 64 proven. 12 refuted. 0 times theorem prover too weak. 104 trivial. 0 not checked. [2023-11-29 00:44:42,427 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-29 00:44:42,494 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 38 proven. 12 refuted. 0 times theorem prover too weak. 130 trivial. 0 not checked. [2023-11-29 00:44:42,495 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-29 00:44:42,495 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [257401918] [2023-11-29 00:44:42,495 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-29 00:44:42,495 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [22936622] [2023-11-29 00:44:42,495 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [22936622] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-29 00:44:42,495 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-29 00:44:42,495 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2023-11-29 00:44:42,496 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [507196295] [2023-11-29 00:44:42,496 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-29 00:44:42,496 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-29 00:44:42,496 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-29 00:44:42,497 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-29 00:44:42,497 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-29 00:44:42,497 INFO L87 Difference]: Start difference. First operand 193 states and 252 transitions. Second operand has 4 states, 4 states have (on average 8.75) internal successors, (35), 4 states have internal predecessors, (35), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2023-11-29 00:44:42,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-29 00:44:42,658 INFO L93 Difference]: Finished difference Result 497 states and 692 transitions. [2023-11-29 00:44:42,658 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-29 00:44:42,658 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 8.75) internal successors, (35), 4 states have internal predecessors, (35), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 86 [2023-11-29 00:44:42,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-29 00:44:42,661 INFO L225 Difference]: With dead ends: 497 [2023-11-29 00:44:42,662 INFO L226 Difference]: Without dead ends: 354 [2023-11-29 00:44:42,663 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 167 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-11-29 00:44:42,664 INFO L413 NwaCegarLoop]: 63 mSDtfsCounter, 15 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 141 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-29 00:44:42,664 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 141 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-29 00:44:42,665 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 354 states. [2023-11-29 00:44:42,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 354 to 337. [2023-11-29 00:44:42,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 337 states, 253 states have (on average 1.2687747035573123) internal successors, (321), 259 states have internal predecessors, (321), 72 states have call successors, (72), 12 states have call predecessors, (72), 11 states have return successors, (71), 65 states have call predecessors, (71), 71 states have call successors, (71) [2023-11-29 00:44:42,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 337 states to 337 states and 464 transitions. [2023-11-29 00:44:42,747 INFO L78 Accepts]: Start accepts. Automaton has 337 states and 464 transitions. Word has length 86 [2023-11-29 00:44:42,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-29 00:44:42,747 INFO L495 AbstractCegarLoop]: Abstraction has 337 states and 464 transitions. [2023-11-29 00:44:42,748 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 8.75) internal successors, (35), 4 states have internal predecessors, (35), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2023-11-29 00:44:42,748 INFO L276 IsEmpty]: Start isEmpty. Operand 337 states and 464 transitions. [2023-11-29 00:44:42,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2023-11-29 00:44:42,750 INFO L187 NwaCegarLoop]: Found error trace [2023-11-29 00:44:42,751 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-29 00:44:42,756 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2023-11-29 00:44:42,951 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2023-11-29 00:44:42,951 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-29 00:44:42,952 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-29 00:44:42,952 INFO L85 PathProgramCache]: Analyzing trace with hash 1715119347, now seen corresponding path program 2 times [2023-11-29 00:44:42,952 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-29 00:44:42,952 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1836331233] [2023-11-29 00:44:42,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-29 00:44:42,952 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-29 00:44:42,960 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-29 00:44:42,960 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [940460256] [2023-11-29 00:44:42,960 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2023-11-29 00:44:42,960 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-29 00:44:42,961 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 [2023-11-29 00:44:42,961 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-29 00:44:42,963 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-11-29 00:44:43,027 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2023-11-29 00:44:43,027 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-29 00:44:43,028 INFO L262 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 17 conjunts are in the unsatisfiable core [2023-11-29 00:44:43,031 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-29 00:44:43,164 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 58 proven. 110 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-29 00:44:43,164 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-29 00:44:43,352 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 32 proven. 26 refuted. 0 times theorem prover too weak. 118 trivial. 0 not checked. [2023-11-29 00:44:43,353 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-29 00:44:43,353 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1836331233] [2023-11-29 00:44:43,353 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-29 00:44:43,353 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [940460256] [2023-11-29 00:44:43,353 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [940460256] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-29 00:44:43,353 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-29 00:44:43,353 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11] total 20 [2023-11-29 00:44:43,353 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [83118584] [2023-11-29 00:44:43,354 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-29 00:44:43,354 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-11-29 00:44:43,354 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-29 00:44:43,355 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-11-29 00:44:43,355 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=222, Unknown=0, NotChecked=0, Total=380 [2023-11-29 00:44:43,355 INFO L87 Difference]: Start difference. First operand 337 states and 464 transitions. Second operand has 20 states, 20 states have (on average 4.55) internal successors, (91), 20 states have internal predecessors, (91), 17 states have call successors, (21), 10 states have call predecessors, (21), 10 states have return successors, (20), 17 states have call predecessors, (20), 17 states have call successors, (20) [2023-11-29 00:44:44,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-29 00:44:44,012 INFO L93 Difference]: Finished difference Result 980 states and 1418 transitions. [2023-11-29 00:44:44,012 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2023-11-29 00:44:44,012 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 4.55) internal successors, (91), 20 states have internal predecessors, (91), 17 states have call successors, (21), 10 states have call predecessors, (21), 10 states have return successors, (20), 17 states have call predecessors, (20), 17 states have call successors, (20) Word has length 86 [2023-11-29 00:44:44,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-29 00:44:44,019 INFO L225 Difference]: With dead ends: 980 [2023-11-29 00:44:44,019 INFO L226 Difference]: Without dead ends: 837 [2023-11-29 00:44:44,020 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 184 GetRequests, 152 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 134 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=403, Invalid=719, Unknown=0, NotChecked=0, Total=1122 [2023-11-29 00:44:44,021 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 258 mSDsluCounter, 266 mSDsCounter, 0 mSdLazyCounter, 174 mSolverCounterSat, 74 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 258 SdHoareTripleChecker+Valid, 296 SdHoareTripleChecker+Invalid, 248 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 74 IncrementalHoareTripleChecker+Valid, 174 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-29 00:44:44,021 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [258 Valid, 296 Invalid, 248 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [74 Valid, 174 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-29 00:44:44,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 837 states. [2023-11-29 00:44:44,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 837 to 788. [2023-11-29 00:44:44,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 788 states, 595 states have (on average 1.26890756302521) internal successors, (755), 604 states have internal predecessors, (755), 175 states have call successors, (175), 18 states have call predecessors, (175), 17 states have return successors, (174), 165 states have call predecessors, (174), 174 states have call successors, (174) [2023-11-29 00:44:44,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 788 states to 788 states and 1104 transitions. [2023-11-29 00:44:44,221 INFO L78 Accepts]: Start accepts. Automaton has 788 states and 1104 transitions. Word has length 86 [2023-11-29 00:44:44,221 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-29 00:44:44,221 INFO L495 AbstractCegarLoop]: Abstraction has 788 states and 1104 transitions. [2023-11-29 00:44:44,222 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 4.55) internal successors, (91), 20 states have internal predecessors, (91), 17 states have call successors, (21), 10 states have call predecessors, (21), 10 states have return successors, (20), 17 states have call predecessors, (20), 17 states have call successors, (20) [2023-11-29 00:44:44,222 INFO L276 IsEmpty]: Start isEmpty. Operand 788 states and 1104 transitions. [2023-11-29 00:44:44,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2023-11-29 00:44:44,225 INFO L187 NwaCegarLoop]: Found error trace [2023-11-29 00:44:44,225 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-29 00:44:44,230 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2023-11-29 00:44:44,426 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2023-11-29 00:44:44,426 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-29 00:44:44,426 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-29 00:44:44,426 INFO L85 PathProgramCache]: Analyzing trace with hash 1117496236, now seen corresponding path program 1 times [2023-11-29 00:44:44,426 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-29 00:44:44,427 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [670593654] [2023-11-29 00:44:44,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-29 00:44:44,427 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-29 00:44:44,436 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-29 00:44:44,436 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1985994175] [2023-11-29 00:44:44,436 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-29 00:44:44,437 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-29 00:44:44,437 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 [2023-11-29 00:44:44,438 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-29 00:44:44,439 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-11-29 00:44:44,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-29 00:44:44,509 INFO L262 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 21 conjunts are in the unsatisfiable core [2023-11-29 00:44:44,513 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-29 00:44:44,686 INFO L134 CoverageAnalysis]: Checked inductivity of 216 backedges. 22 proven. 190 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-29 00:44:44,686 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-29 00:44:44,932 INFO L134 CoverageAnalysis]: Checked inductivity of 216 backedges. 22 proven. 46 refuted. 0 times theorem prover too weak. 148 trivial. 0 not checked. [2023-11-29 00:44:44,932 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-29 00:44:44,932 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [670593654] [2023-11-29 00:44:44,933 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-29 00:44:44,933 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1985994175] [2023-11-29 00:44:44,933 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1985994175] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-29 00:44:44,933 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-29 00:44:44,933 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 24 [2023-11-29 00:44:44,933 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [834744158] [2023-11-29 00:44:44,933 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-29 00:44:44,934 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2023-11-29 00:44:44,934 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-29 00:44:44,935 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2023-11-29 00:44:44,935 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=236, Invalid=316, Unknown=0, NotChecked=0, Total=552 [2023-11-29 00:44:44,936 INFO L87 Difference]: Start difference. First operand 788 states and 1104 transitions. Second operand has 24 states, 24 states have (on average 4.291666666666667) internal successors, (103), 24 states have internal predecessors, (103), 21 states have call successors, (23), 12 states have call predecessors, (23), 11 states have return successors, (22), 20 states have call predecessors, (22), 20 states have call successors, (22) [2023-11-29 00:44:45,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-29 00:44:45,676 INFO L93 Difference]: Finished difference Result 1280 states and 1794 transitions. [2023-11-29 00:44:45,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2023-11-29 00:44:45,677 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 4.291666666666667) internal successors, (103), 24 states have internal predecessors, (103), 21 states have call successors, (23), 12 states have call predecessors, (23), 11 states have return successors, (22), 20 states have call predecessors, (22), 20 states have call successors, (22) Word has length 92 [2023-11-29 00:44:45,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-29 00:44:45,683 INFO L225 Difference]: With dead ends: 1280 [2023-11-29 00:44:45,683 INFO L226 Difference]: Without dead ends: 790 [2023-11-29 00:44:45,685 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 160 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 200 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=584, Invalid=1056, Unknown=0, NotChecked=0, Total=1640 [2023-11-29 00:44:45,686 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 370 mSDsluCounter, 300 mSDsCounter, 0 mSdLazyCounter, 206 mSolverCounterSat, 122 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 370 SdHoareTripleChecker+Valid, 330 SdHoareTripleChecker+Invalid, 328 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 122 IncrementalHoareTripleChecker+Valid, 206 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-29 00:44:45,686 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [370 Valid, 330 Invalid, 328 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [122 Valid, 206 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-29 00:44:45,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 790 states. [2023-11-29 00:44:45,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 790 to 735. [2023-11-29 00:44:45,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 735 states, 551 states have (on average 1.221415607985481) internal successors, (673), 555 states have internal predecessors, (673), 162 states have call successors, (162), 22 states have call predecessors, (162), 21 states have return successors, (161), 157 states have call predecessors, (161), 161 states have call successors, (161) [2023-11-29 00:44:45,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 735 states to 735 states and 996 transitions. [2023-11-29 00:44:45,895 INFO L78 Accepts]: Start accepts. Automaton has 735 states and 996 transitions. Word has length 92 [2023-11-29 00:44:45,896 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-29 00:44:45,896 INFO L495 AbstractCegarLoop]: Abstraction has 735 states and 996 transitions. [2023-11-29 00:44:45,896 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 4.291666666666667) internal successors, (103), 24 states have internal predecessors, (103), 21 states have call successors, (23), 12 states have call predecessors, (23), 11 states have return successors, (22), 20 states have call predecessors, (22), 20 states have call successors, (22) [2023-11-29 00:44:45,896 INFO L276 IsEmpty]: Start isEmpty. Operand 735 states and 996 transitions. [2023-11-29 00:44:45,898 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2023-11-29 00:44:45,898 INFO L187 NwaCegarLoop]: Found error trace [2023-11-29 00:44:45,899 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-29 00:44:45,904 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2023-11-29 00:44:46,099 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-11-29 00:44:46,099 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-29 00:44:46,100 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-29 00:44:46,100 INFO L85 PathProgramCache]: Analyzing trace with hash -32862541, now seen corresponding path program 1 times [2023-11-29 00:44:46,100 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-29 00:44:46,100 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [485694204] [2023-11-29 00:44:46,100 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-29 00:44:46,100 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-29 00:44:46,110 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-29 00:44:46,110 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1947130297] [2023-11-29 00:44:46,110 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-29 00:44:46,111 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-29 00:44:46,111 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 [2023-11-29 00:44:46,112 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-29 00:44:46,113 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2023-11-29 00:44:46,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-29 00:44:46,185 INFO L262 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 23 conjunts are in the unsatisfiable core [2023-11-29 00:44:46,188 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-29 00:44:46,381 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 20 proven. 236 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-29 00:44:46,381 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-29 00:44:46,667 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 20 proven. 56 refuted. 0 times theorem prover too weak. 184 trivial. 0 not checked. [2023-11-29 00:44:46,667 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-29 00:44:46,667 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [485694204] [2023-11-29 00:44:46,667 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-29 00:44:46,667 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1947130297] [2023-11-29 00:44:46,667 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1947130297] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-29 00:44:46,667 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-29 00:44:46,667 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 26 [2023-11-29 00:44:46,668 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2147451048] [2023-11-29 00:44:46,668 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-29 00:44:46,668 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2023-11-29 00:44:46,668 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-29 00:44:46,669 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2023-11-29 00:44:46,670 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=281, Invalid=369, Unknown=0, NotChecked=0, Total=650 [2023-11-29 00:44:46,670 INFO L87 Difference]: Start difference. First operand 735 states and 996 transitions. Second operand has 26 states, 26 states have (on average 4.230769230769231) internal successors, (110), 26 states have internal predecessors, (110), 23 states have call successors, (25), 13 states have call predecessors, (25), 12 states have return successors, (24), 22 states have call predecessors, (24), 22 states have call successors, (24) [2023-11-29 00:44:47,640 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-29 00:44:47,641 INFO L93 Difference]: Finished difference Result 845 states and 1156 transitions. [2023-11-29 00:44:47,641 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2023-11-29 00:44:47,642 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 4.230769230769231) internal successors, (110), 26 states have internal predecessors, (110), 23 states have call successors, (25), 13 states have call predecessors, (25), 12 states have return successors, (24), 22 states have call predecessors, (24), 22 states have call successors, (24) Word has length 98 [2023-11-29 00:44:47,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-29 00:44:47,647 INFO L225 Difference]: With dead ends: 845 [2023-11-29 00:44:47,647 INFO L226 Difference]: Without dead ends: 840 [2023-11-29 00:44:47,648 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 212 GetRequests, 170 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 229 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=670, Invalid=1222, Unknown=0, NotChecked=0, Total=1892 [2023-11-29 00:44:47,649 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 359 mSDsluCounter, 305 mSDsCounter, 0 mSdLazyCounter, 217 mSolverCounterSat, 143 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 359 SdHoareTripleChecker+Valid, 335 SdHoareTripleChecker+Invalid, 360 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 143 IncrementalHoareTripleChecker+Valid, 217 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-29 00:44:47,649 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [359 Valid, 335 Invalid, 360 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [143 Valid, 217 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-29 00:44:47,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 840 states. [2023-11-29 00:44:47,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 840 to 825. [2023-11-29 00:44:47,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 825 states, 619 states have (on average 1.2003231017770597) internal successors, (743), 625 states have internal predecessors, (743), 182 states have call successors, (182), 24 states have call predecessors, (182), 23 states have return successors, (181), 175 states have call predecessors, (181), 181 states have call successors, (181) [2023-11-29 00:44:47,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 825 states to 825 states and 1106 transitions. [2023-11-29 00:44:47,870 INFO L78 Accepts]: Start accepts. Automaton has 825 states and 1106 transitions. Word has length 98 [2023-11-29 00:44:47,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-29 00:44:47,871 INFO L495 AbstractCegarLoop]: Abstraction has 825 states and 1106 transitions. [2023-11-29 00:44:47,871 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 4.230769230769231) internal successors, (110), 26 states have internal predecessors, (110), 23 states have call successors, (25), 13 states have call predecessors, (25), 12 states have return successors, (24), 22 states have call predecessors, (24), 22 states have call successors, (24) [2023-11-29 00:44:47,871 INFO L276 IsEmpty]: Start isEmpty. Operand 825 states and 1106 transitions. [2023-11-29 00:44:47,876 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2023-11-29 00:44:47,876 INFO L187 NwaCegarLoop]: Found error trace [2023-11-29 00:44:47,877 INFO L195 NwaCegarLoop]: trace histogram [20, 19, 19, 9, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 5, 4, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-29 00:44:47,881 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2023-11-29 00:44:48,077 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2023-11-29 00:44:48,077 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-29 00:44:48,078 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-29 00:44:48,078 INFO L85 PathProgramCache]: Analyzing trace with hash -1211281524, now seen corresponding path program 3 times [2023-11-29 00:44:48,078 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-29 00:44:48,078 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1846716779] [2023-11-29 00:44:48,078 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-29 00:44:48,078 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-29 00:44:48,088 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-29 00:44:48,088 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1870218781] [2023-11-29 00:44:48,088 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-29 00:44:48,088 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-29 00:44:48,088 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 [2023-11-29 00:44:48,089 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-29 00:44:48,090 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2023-11-29 00:44:48,164 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-11-29 00:44:48,164 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-29 00:44:48,165 INFO L262 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-29 00:44:48,168 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-29 00:44:48,188 INFO L134 CoverageAnalysis]: Checked inductivity of 984 backedges. 255 proven. 0 refuted. 0 times theorem prover too weak. 729 trivial. 0 not checked. [2023-11-29 00:44:48,188 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-29 00:44:48,188 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-29 00:44:48,188 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1846716779] [2023-11-29 00:44:48,188 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-29 00:44:48,188 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1870218781] [2023-11-29 00:44:48,188 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1870218781] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-29 00:44:48,188 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-29 00:44:48,189 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-29 00:44:48,189 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [117450385] [2023-11-29 00:44:48,189 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-29 00:44:48,189 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-29 00:44:48,189 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-29 00:44:48,190 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-29 00:44:48,190 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-29 00:44:48,190 INFO L87 Difference]: Start difference. First operand 825 states and 1106 transitions. Second operand has 5 states, 5 states have (on average 7.4) internal successors, (37), 5 states have internal predecessors, (37), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-29 00:44:48,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-29 00:44:48,458 INFO L93 Difference]: Finished difference Result 1123 states and 1527 transitions. [2023-11-29 00:44:48,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-29 00:44:48,459 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 7.4) internal successors, (37), 5 states have internal predecessors, (37), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 176 [2023-11-29 00:44:48,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-29 00:44:48,465 INFO L225 Difference]: With dead ends: 1123 [2023-11-29 00:44:48,465 INFO L226 Difference]: Without dead ends: 904 [2023-11-29 00:44:48,466 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 172 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2023-11-29 00:44:48,466 INFO L413 NwaCegarLoop]: 42 mSDtfsCounter, 17 mSDsluCounter, 103 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 145 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-29 00:44:48,467 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 145 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-29 00:44:48,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 904 states. [2023-11-29 00:44:48,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 904 to 837. [2023-11-29 00:44:48,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 837 states, 630 states have (on average 1.1857142857142857) internal successors, (747), 636 states have internal predecessors, (747), 182 states have call successors, (182), 25 states have call predecessors, (182), 24 states have return successors, (181), 175 states have call predecessors, (181), 181 states have call successors, (181) [2023-11-29 00:44:48,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 837 states to 837 states and 1110 transitions. [2023-11-29 00:44:48,640 INFO L78 Accepts]: Start accepts. Automaton has 837 states and 1110 transitions. Word has length 176 [2023-11-29 00:44:48,641 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-29 00:44:48,641 INFO L495 AbstractCegarLoop]: Abstraction has 837 states and 1110 transitions. [2023-11-29 00:44:48,641 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 7.4) internal successors, (37), 5 states have internal predecessors, (37), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-29 00:44:48,641 INFO L276 IsEmpty]: Start isEmpty. Operand 837 states and 1110 transitions. [2023-11-29 00:44:48,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 183 [2023-11-29 00:44:48,644 INFO L187 NwaCegarLoop]: Found error trace [2023-11-29 00:44:48,645 INFO L195 NwaCegarLoop]: trace histogram [21, 20, 20, 11, 10, 10, 10, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-29 00:44:48,650 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2023-11-29 00:44:48,845 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2023-11-29 00:44:48,846 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-29 00:44:48,846 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-29 00:44:48,846 INFO L85 PathProgramCache]: Analyzing trace with hash 658813895, now seen corresponding path program 4 times [2023-11-29 00:44:48,846 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-29 00:44:48,846 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1531437797] [2023-11-29 00:44:48,846 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-29 00:44:48,847 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-29 00:44:48,858 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-29 00:44:48,859 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1056990232] [2023-11-29 00:44:48,859 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-29 00:44:48,859 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-29 00:44:48,859 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 [2023-11-29 00:44:48,860 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-29 00:44:48,861 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2023-11-29 00:44:48,941 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-29 00:44:48,941 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-29 00:44:48,942 INFO L262 TraceCheckSpWp]: Trace formula consists of 355 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-29 00:44:48,945 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-29 00:44:48,967 INFO L134 CoverageAnalysis]: Checked inductivity of 1104 backedges. 612 proven. 0 refuted. 0 times theorem prover too weak. 492 trivial. 0 not checked. [2023-11-29 00:44:48,967 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-29 00:44:48,967 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-29 00:44:48,967 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1531437797] [2023-11-29 00:44:48,967 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-29 00:44:48,967 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1056990232] [2023-11-29 00:44:48,967 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1056990232] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-29 00:44:48,967 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-29 00:44:48,968 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-29 00:44:48,968 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [872163948] [2023-11-29 00:44:48,968 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-29 00:44:48,968 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-29 00:44:48,968 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-29 00:44:48,969 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-29 00:44:48,969 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-29 00:44:48,969 INFO L87 Difference]: Start difference. First operand 837 states and 1110 transitions. Second operand has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 3 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-11-29 00:44:49,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-29 00:44:49,179 INFO L93 Difference]: Finished difference Result 1422 states and 1886 transitions. [2023-11-29 00:44:49,179 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-29 00:44:49,179 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 3 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 182 [2023-11-29 00:44:49,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-29 00:44:49,185 INFO L225 Difference]: With dead ends: 1422 [2023-11-29 00:44:49,185 INFO L226 Difference]: Without dead ends: 898 [2023-11-29 00:44:49,187 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 180 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-29 00:44:49,187 INFO L413 NwaCegarLoop]: 44 mSDtfsCounter, 3 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-29 00:44:49,188 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 75 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-29 00:44:49,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 898 states. [2023-11-29 00:44:49,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 898 to 829. [2023-11-29 00:44:49,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 829 states, 625 states have (on average 1.1792) internal successors, (737), 633 states have internal predecessors, (737), 179 states have call successors, (179), 25 states have call predecessors, (179), 24 states have return successors, (178), 170 states have call predecessors, (178), 178 states have call successors, (178) [2023-11-29 00:44:49,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 829 states to 829 states and 1094 transitions. [2023-11-29 00:44:49,356 INFO L78 Accepts]: Start accepts. Automaton has 829 states and 1094 transitions. Word has length 182 [2023-11-29 00:44:49,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-29 00:44:49,357 INFO L495 AbstractCegarLoop]: Abstraction has 829 states and 1094 transitions. [2023-11-29 00:44:49,357 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 3 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-11-29 00:44:49,357 INFO L276 IsEmpty]: Start isEmpty. Operand 829 states and 1094 transitions. [2023-11-29 00:44:49,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 183 [2023-11-29 00:44:49,361 INFO L187 NwaCegarLoop]: Found error trace [2023-11-29 00:44:49,361 INFO L195 NwaCegarLoop]: trace histogram [21, 20, 20, 9, 8, 8, 8, 8, 7, 7, 7, 6, 5, 5, 5, 5, 4, 4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-29 00:44:49,365 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2023-11-29 00:44:49,561 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2023-11-29 00:44:49,561 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-29 00:44:49,562 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-29 00:44:49,562 INFO L85 PathProgramCache]: Analyzing trace with hash -1813901725, now seen corresponding path program 5 times [2023-11-29 00:44:49,562 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-29 00:44:49,562 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [575141780] [2023-11-29 00:44:49,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-29 00:44:49,562 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-29 00:44:49,575 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-29 00:44:49,576 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1686494577] [2023-11-29 00:44:49,576 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2023-11-29 00:44:49,576 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-29 00:44:49,576 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 [2023-11-29 00:44:49,577 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-29 00:44:49,579 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2023-11-29 00:44:49,757 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 14 check-sat command(s) [2023-11-29 00:44:49,757 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-29 00:44:49,759 INFO L262 TraceCheckSpWp]: Trace formula consists of 349 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-29 00:44:49,761 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-29 00:44:49,783 INFO L134 CoverageAnalysis]: Checked inductivity of 1080 backedges. 120 proven. 0 refuted. 0 times theorem prover too weak. 960 trivial. 0 not checked. [2023-11-29 00:44:49,783 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-29 00:44:49,784 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-29 00:44:49,784 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [575141780] [2023-11-29 00:44:49,784 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-29 00:44:49,784 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1686494577] [2023-11-29 00:44:49,784 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1686494577] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-29 00:44:49,784 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-29 00:44:49,784 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-29 00:44:49,784 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [841319962] [2023-11-29 00:44:49,784 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-29 00:44:49,785 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-29 00:44:49,785 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-29 00:44:49,785 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-29 00:44:49,786 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-29 00:44:49,786 INFO L87 Difference]: Start difference. First operand 829 states and 1094 transitions. Second operand has 4 states, 4 states have (on average 8.75) internal successors, (35), 4 states have internal predecessors, (35), 4 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2023-11-29 00:44:50,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-29 00:44:50,040 INFO L93 Difference]: Finished difference Result 882 states and 1152 transitions. [2023-11-29 00:44:50,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-29 00:44:50,040 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 8.75) internal successors, (35), 4 states have internal predecessors, (35), 4 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) Word has length 182 [2023-11-29 00:44:50,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-29 00:44:50,046 INFO L225 Difference]: With dead ends: 882 [2023-11-29 00:44:50,046 INFO L226 Difference]: Without dead ends: 797 [2023-11-29 00:44:50,046 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 179 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-29 00:44:50,047 INFO L413 NwaCegarLoop]: 47 mSDtfsCounter, 9 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 117 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-29 00:44:50,047 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 117 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-29 00:44:50,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 797 states. [2023-11-29 00:44:50,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 797 to 776. [2023-11-29 00:44:50,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 776 states, 585 states have (on average 1.170940170940171) internal successors, (685), 592 states have internal predecessors, (685), 166 states have call successors, (166), 25 states have call predecessors, (166), 24 states have return successors, (165), 158 states have call predecessors, (165), 165 states have call successors, (165) [2023-11-29 00:44:50,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 776 states to 776 states and 1016 transitions. [2023-11-29 00:44:50,277 INFO L78 Accepts]: Start accepts. Automaton has 776 states and 1016 transitions. Word has length 182 [2023-11-29 00:44:50,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-29 00:44:50,278 INFO L495 AbstractCegarLoop]: Abstraction has 776 states and 1016 transitions. [2023-11-29 00:44:50,278 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 8.75) internal successors, (35), 4 states have internal predecessors, (35), 4 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2023-11-29 00:44:50,278 INFO L276 IsEmpty]: Start isEmpty. Operand 776 states and 1016 transitions. [2023-11-29 00:44:50,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 183 [2023-11-29 00:44:50,282 INFO L187 NwaCegarLoop]: Found error trace [2023-11-29 00:44:50,282 INFO L195 NwaCegarLoop]: trace histogram [21, 20, 20, 11, 10, 10, 10, 7, 7, 6, 6, 6, 5, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-29 00:44:50,288 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2023-11-29 00:44:50,483 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2023-11-29 00:44:50,483 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-29 00:44:50,483 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-29 00:44:50,483 INFO L85 PathProgramCache]: Analyzing trace with hash 1819818917, now seen corresponding path program 6 times [2023-11-29 00:44:50,483 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-29 00:44:50,483 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2139228739] [2023-11-29 00:44:50,483 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-29 00:44:50,484 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-29 00:44:50,494 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-29 00:44:50,494 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1784260145] [2023-11-29 00:44:50,494 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2023-11-29 00:44:50,494 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-29 00:44:50,494 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 [2023-11-29 00:44:50,495 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-29 00:44:50,496 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2023-11-29 00:44:53,777 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 12 check-sat command(s) [2023-11-29 00:44:53,777 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-29 00:44:53,781 INFO L262 TraceCheckSpWp]: Trace formula consists of 415 conjuncts, 26 conjunts are in the unsatisfiable core [2023-11-29 00:44:53,785 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-29 00:44:54,339 INFO L134 CoverageAnalysis]: Checked inductivity of 1108 backedges. 104 proven. 240 refuted. 0 times theorem prover too weak. 764 trivial. 0 not checked. [2023-11-29 00:44:54,339 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-29 00:44:54,890 INFO L134 CoverageAnalysis]: Checked inductivity of 1108 backedges. 88 proven. 256 refuted. 0 times theorem prover too weak. 764 trivial. 0 not checked. [2023-11-29 00:44:54,891 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-29 00:44:54,891 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2139228739] [2023-11-29 00:44:54,891 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-29 00:44:54,891 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1784260145] [2023-11-29 00:44:54,891 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1784260145] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-29 00:44:54,891 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-29 00:44:54,891 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 22 [2023-11-29 00:44:54,891 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1699605250] [2023-11-29 00:44:54,892 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-29 00:44:54,892 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2023-11-29 00:44:54,892 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-29 00:44:54,893 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2023-11-29 00:44:54,893 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=385, Unknown=0, NotChecked=0, Total=462 [2023-11-29 00:44:54,894 INFO L87 Difference]: Start difference. First operand 776 states and 1016 transitions. Second operand has 22 states, 22 states have (on average 6.2727272727272725) internal successors, (138), 22 states have internal predecessors, (138), 22 states have call successors, (43), 2 states have call predecessors, (43), 1 states have return successors, (42), 21 states have call predecessors, (42), 21 states have call successors, (42) [2023-11-29 00:44:59,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-29 00:44:59,870 INFO L93 Difference]: Finished difference Result 3287 states and 4525 transitions. [2023-11-29 00:44:59,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2023-11-29 00:44:59,870 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 6.2727272727272725) internal successors, (138), 22 states have internal predecessors, (138), 22 states have call successors, (43), 2 states have call predecessors, (43), 1 states have return successors, (42), 21 states have call predecessors, (42), 21 states have call successors, (42) Word has length 182 [2023-11-29 00:44:59,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-29 00:44:59,888 INFO L225 Difference]: With dead ends: 3287 [2023-11-29 00:44:59,888 INFO L226 Difference]: Without dead ends: 2960 [2023-11-29 00:44:59,892 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 408 GetRequests, 342 SyntacticMatches, 0 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1091 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=803, Invalid=3753, Unknown=0, NotChecked=0, Total=4556 [2023-11-29 00:44:59,893 INFO L413 NwaCegarLoop]: 318 mSDtfsCounter, 350 mSDsluCounter, 2484 mSDsCounter, 0 mSdLazyCounter, 1199 mSolverCounterSat, 87 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 357 SdHoareTripleChecker+Valid, 2802 SdHoareTripleChecker+Invalid, 1286 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 87 IncrementalHoareTripleChecker+Valid, 1199 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2023-11-29 00:44:59,893 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [357 Valid, 2802 Invalid, 1286 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [87 Valid, 1199 Invalid, 0 Unknown, 0 Unchecked, 2.5s Time] [2023-11-29 00:44:59,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2960 states. [2023-11-29 00:45:00,518 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2960 to 2163. [2023-11-29 00:45:00,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2163 states, 1636 states have (on average 1.2145476772616137) internal successors, (1987), 1670 states have internal predecessors, (1987), 502 states have call successors, (502), 25 states have call predecessors, (502), 24 states have return successors, (501), 467 states have call predecessors, (501), 501 states have call successors, (501) [2023-11-29 00:45:00,529 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2163 states to 2163 states and 2990 transitions. [2023-11-29 00:45:00,529 INFO L78 Accepts]: Start accepts. Automaton has 2163 states and 2990 transitions. Word has length 182 [2023-11-29 00:45:00,529 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-29 00:45:00,529 INFO L495 AbstractCegarLoop]: Abstraction has 2163 states and 2990 transitions. [2023-11-29 00:45:00,529 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 6.2727272727272725) internal successors, (138), 22 states have internal predecessors, (138), 22 states have call successors, (43), 2 states have call predecessors, (43), 1 states have return successors, (42), 21 states have call predecessors, (42), 21 states have call successors, (42) [2023-11-29 00:45:00,530 INFO L276 IsEmpty]: Start isEmpty. Operand 2163 states and 2990 transitions. [2023-11-29 00:45:00,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 183 [2023-11-29 00:45:00,536 INFO L187 NwaCegarLoop]: Found error trace [2023-11-29 00:45:00,536 INFO L195 NwaCegarLoop]: trace histogram [21, 20, 20, 10, 9, 9, 9, 8, 7, 7, 7, 6, 5, 4, 4, 4, 4, 4, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-29 00:45:00,543 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2023-11-29 00:45:00,737 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2023-11-29 00:45:00,737 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-29 00:45:00,737 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-29 00:45:00,737 INFO L85 PathProgramCache]: Analyzing trace with hash 1389015027, now seen corresponding path program 7 times [2023-11-29 00:45:00,737 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-29 00:45:00,737 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [924917707] [2023-11-29 00:45:00,737 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-29 00:45:00,738 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-29 00:45:00,748 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-29 00:45:00,748 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [91941049] [2023-11-29 00:45:00,748 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-29 00:45:00,748 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-29 00:45:00,748 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 [2023-11-29 00:45:00,749 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-29 00:45:00,751 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2023-11-29 00:45:00,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-29 00:45:00,847 INFO L262 TraceCheckSpWp]: Trace formula consists of 415 conjuncts, 13 conjunts are in the unsatisfiable core [2023-11-29 00:45:00,851 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-29 00:45:00,985 INFO L134 CoverageAnalysis]: Checked inductivity of 1096 backedges. 516 proven. 84 refuted. 0 times theorem prover too weak. 496 trivial. 0 not checked. [2023-11-29 00:45:00,986 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-29 00:45:01,182 INFO L134 CoverageAnalysis]: Checked inductivity of 1096 backedges. 226 proven. 84 refuted. 0 times theorem prover too weak. 786 trivial. 0 not checked. [2023-11-29 00:45:01,183 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-29 00:45:01,183 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [924917707] [2023-11-29 00:45:01,183 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-29 00:45:01,183 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [91941049] [2023-11-29 00:45:01,183 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [91941049] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-29 00:45:01,183 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-29 00:45:01,183 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 14 [2023-11-29 00:45:01,183 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1503707863] [2023-11-29 00:45:01,183 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-29 00:45:01,184 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-11-29 00:45:01,184 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-29 00:45:01,185 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-11-29 00:45:01,185 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2023-11-29 00:45:01,185 INFO L87 Difference]: Start difference. First operand 2163 states and 2990 transitions. Second operand has 14 states, 14 states have (on average 7.642857142857143) internal successors, (107), 14 states have internal predecessors, (107), 14 states have call successors, (36), 2 states have call predecessors, (36), 2 states have return successors, (35), 14 states have call predecessors, (35), 14 states have call successors, (35) [2023-11-29 00:45:03,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-29 00:45:03,223 INFO L93 Difference]: Finished difference Result 4335 states and 6051 transitions. [2023-11-29 00:45:03,223 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2023-11-29 00:45:03,224 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 7.642857142857143) internal successors, (107), 14 states have internal predecessors, (107), 14 states have call successors, (36), 2 states have call predecessors, (36), 2 states have return successors, (35), 14 states have call predecessors, (35), 14 states have call successors, (35) Word has length 182 [2023-11-29 00:45:03,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-29 00:45:03,241 INFO L225 Difference]: With dead ends: 4335 [2023-11-29 00:45:03,241 INFO L226 Difference]: Without dead ends: 3867 [2023-11-29 00:45:03,243 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 412 GetRequests, 375 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 264 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=385, Invalid=1097, Unknown=0, NotChecked=0, Total=1482 [2023-11-29 00:45:03,244 INFO L413 NwaCegarLoop]: 137 mSDtfsCounter, 210 mSDsluCounter, 801 mSDsCounter, 0 mSdLazyCounter, 377 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 215 SdHoareTripleChecker+Valid, 938 SdHoareTripleChecker+Invalid, 432 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 377 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-29 00:45:03,244 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [215 Valid, 938 Invalid, 432 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 377 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-29 00:45:03,247 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3867 states. [2023-11-29 00:45:04,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3867 to 3116. [2023-11-29 00:45:04,313 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3116 states, 2353 states have (on average 1.199320016999575) internal successors, (2822), 2406 states have internal predecessors, (2822), 738 states have call successors, (738), 25 states have call predecessors, (738), 24 states have return successors, (737), 684 states have call predecessors, (737), 737 states have call successors, (737) [2023-11-29 00:45:04,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3116 states to 3116 states and 4297 transitions. [2023-11-29 00:45:04,323 INFO L78 Accepts]: Start accepts. Automaton has 3116 states and 4297 transitions. Word has length 182 [2023-11-29 00:45:04,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-29 00:45:04,324 INFO L495 AbstractCegarLoop]: Abstraction has 3116 states and 4297 transitions. [2023-11-29 00:45:04,324 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 7.642857142857143) internal successors, (107), 14 states have internal predecessors, (107), 14 states have call successors, (36), 2 states have call predecessors, (36), 2 states have return successors, (35), 14 states have call predecessors, (35), 14 states have call successors, (35) [2023-11-29 00:45:04,324 INFO L276 IsEmpty]: Start isEmpty. Operand 3116 states and 4297 transitions. [2023-11-29 00:45:04,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 183 [2023-11-29 00:45:04,335 INFO L187 NwaCegarLoop]: Found error trace [2023-11-29 00:45:04,335 INFO L195 NwaCegarLoop]: trace histogram [21, 20, 20, 11, 10, 10, 10, 7, 7, 6, 6, 6, 5, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-29 00:45:04,340 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2023-11-29 00:45:04,536 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-29 00:45:04,536 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-29 00:45:04,536 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-29 00:45:04,536 INFO L85 PathProgramCache]: Analyzing trace with hash -998111323, now seen corresponding path program 8 times [2023-11-29 00:45:04,536 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-29 00:45:04,537 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [458755963] [2023-11-29 00:45:04,537 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-29 00:45:04,537 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-29 00:45:04,546 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-29 00:45:04,547 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [973506114] [2023-11-29 00:45:04,547 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2023-11-29 00:45:04,547 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-29 00:45:04,547 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 [2023-11-29 00:45:04,548 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-29 00:45:04,552 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2023-11-29 00:45:04,642 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2023-11-29 00:45:04,642 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-29 00:45:04,644 INFO L262 TraceCheckSpWp]: Trace formula consists of 415 conjuncts, 16 conjunts are in the unsatisfiable core [2023-11-29 00:45:04,647 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-29 00:45:04,793 INFO L134 CoverageAnalysis]: Checked inductivity of 1108 backedges. 80 proven. 252 refuted. 0 times theorem prover too weak. 776 trivial. 0 not checked. [2023-11-29 00:45:04,793 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-29 00:45:05,091 INFO L134 CoverageAnalysis]: Checked inductivity of 1108 backedges. 80 proven. 252 refuted. 0 times theorem prover too weak. 776 trivial. 0 not checked. [2023-11-29 00:45:05,091 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-29 00:45:05,091 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [458755963] [2023-11-29 00:45:05,091 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-29 00:45:05,091 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [973506114] [2023-11-29 00:45:05,091 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [973506114] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-29 00:45:05,091 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-29 00:45:05,091 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 20 [2023-11-29 00:45:05,092 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1727809560] [2023-11-29 00:45:05,092 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-29 00:45:05,092 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-11-29 00:45:05,092 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-29 00:45:05,093 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-11-29 00:45:05,093 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=330, Unknown=0, NotChecked=0, Total=380 [2023-11-29 00:45:05,094 INFO L87 Difference]: Start difference. First operand 3116 states and 4297 transitions. Second operand has 20 states, 20 states have (on average 6.2) internal successors, (124), 20 states have internal predecessors, (124), 20 states have call successors, (37), 2 states have call predecessors, (37), 1 states have return successors, (36), 19 states have call predecessors, (36), 19 states have call successors, (36) [2023-11-29 00:45:10,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-29 00:45:10,437 INFO L93 Difference]: Finished difference Result 6793 states and 9463 transitions. [2023-11-29 00:45:10,438 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2023-11-29 00:45:10,438 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 6.2) internal successors, (124), 20 states have internal predecessors, (124), 20 states have call successors, (37), 2 states have call predecessors, (37), 1 states have return successors, (36), 19 states have call predecessors, (36), 19 states have call successors, (36) Word has length 182 [2023-11-29 00:45:10,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-29 00:45:10,469 INFO L225 Difference]: With dead ends: 6793 [2023-11-29 00:45:10,469 INFO L226 Difference]: Without dead ends: 6381 [2023-11-29 00:45:10,474 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 437 GetRequests, 344 SyntacticMatches, 0 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2695 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1163, Invalid=7767, Unknown=0, NotChecked=0, Total=8930 [2023-11-29 00:45:10,475 INFO L413 NwaCegarLoop]: 356 mSDtfsCounter, 429 mSDsluCounter, 3046 mSDsCounter, 0 mSdLazyCounter, 1474 mSolverCounterSat, 130 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 435 SdHoareTripleChecker+Valid, 3402 SdHoareTripleChecker+Invalid, 1604 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 130 IncrementalHoareTripleChecker+Valid, 1474 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2023-11-29 00:45:10,475 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [435 Valid, 3402 Invalid, 1604 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [130 Valid, 1474 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2023-11-29 00:45:10,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6381 states. [2023-11-29 00:45:12,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6381 to 4342. [2023-11-29 00:45:12,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4342 states, 3272 states have (on average 1.2062958435207825) internal successors, (3947), 3349 states have internal predecessors, (3947), 1045 states have call successors, (1045), 25 states have call predecessors, (1045), 24 states have return successors, (1044), 967 states have call predecessors, (1044), 1044 states have call successors, (1044) [2023-11-29 00:45:12,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4342 states to 4342 states and 6036 transitions. [2023-11-29 00:45:12,060 INFO L78 Accepts]: Start accepts. Automaton has 4342 states and 6036 transitions. Word has length 182 [2023-11-29 00:45:12,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-29 00:45:12,060 INFO L495 AbstractCegarLoop]: Abstraction has 4342 states and 6036 transitions. [2023-11-29 00:45:12,061 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 6.2) internal successors, (124), 20 states have internal predecessors, (124), 20 states have call successors, (37), 2 states have call predecessors, (37), 1 states have return successors, (36), 19 states have call predecessors, (36), 19 states have call successors, (36) [2023-11-29 00:45:12,061 INFO L276 IsEmpty]: Start isEmpty. Operand 4342 states and 6036 transitions. [2023-11-29 00:45:12,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 183 [2023-11-29 00:45:12,081 INFO L187 NwaCegarLoop]: Found error trace [2023-11-29 00:45:12,081 INFO L195 NwaCegarLoop]: trace histogram [21, 20, 20, 11, 10, 10, 10, 7, 7, 6, 6, 6, 5, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-29 00:45:12,087 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2023-11-29 00:45:12,282 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-29 00:45:12,282 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-29 00:45:12,282 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-29 00:45:12,282 INFO L85 PathProgramCache]: Analyzing trace with hash -115879003, now seen corresponding path program 9 times [2023-11-29 00:45:12,282 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-29 00:45:12,282 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1984660197] [2023-11-29 00:45:12,282 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-29 00:45:12,283 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-29 00:45:12,293 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-29 00:45:12,293 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [926328416] [2023-11-29 00:45:12,293 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-29 00:45:12,294 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-29 00:45:12,294 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 [2023-11-29 00:45:12,295 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-29 00:45:12,307 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2023-11-29 00:45:12,864 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2023-11-29 00:45:12,864 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-29 00:45:12,867 INFO L262 TraceCheckSpWp]: Trace formula consists of 415 conjuncts, 43 conjunts are in the unsatisfiable core [2023-11-29 00:45:12,870 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-29 00:45:13,232 INFO L134 CoverageAnalysis]: Checked inductivity of 1108 backedges. 60 proven. 1044 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-29 00:45:13,232 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-29 00:45:13,806 INFO L134 CoverageAnalysis]: Checked inductivity of 1108 backedges. 60 proven. 284 refuted. 0 times theorem prover too weak. 764 trivial. 0 not checked. [2023-11-29 00:45:13,806 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-29 00:45:13,806 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1984660197] [2023-11-29 00:45:13,806 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-29 00:45:13,806 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [926328416] [2023-11-29 00:45:13,807 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [926328416] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-29 00:45:13,807 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-29 00:45:13,807 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 24] total 46 [2023-11-29 00:45:13,807 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1389752706] [2023-11-29 00:45:13,807 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-29 00:45:13,808 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2023-11-29 00:45:13,808 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-29 00:45:13,809 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2023-11-29 00:45:13,810 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=951, Invalid=1119, Unknown=0, NotChecked=0, Total=2070 [2023-11-29 00:45:13,811 INFO L87 Difference]: Start difference. First operand 4342 states and 6036 transitions. Second operand has 46 states, 46 states have (on average 4.434782608695652) internal successors, (204), 46 states have internal predecessors, (204), 43 states have call successors, (45), 23 states have call predecessors, (45), 22 states have return successors, (44), 42 states have call predecessors, (44), 42 states have call successors, (44) [2023-11-29 00:45:22,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-29 00:45:22,180 INFO L93 Difference]: Finished difference Result 18451 states and 28297 transitions. [2023-11-29 00:45:22,181 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2023-11-29 00:45:22,181 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 4.434782608695652) internal successors, (204), 46 states have internal predecessors, (204), 43 states have call successors, (45), 23 states have call predecessors, (45), 22 states have return successors, (44), 42 states have call predecessors, (44), 42 states have call successors, (44) Word has length 182 [2023-11-29 00:45:22,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-29 00:45:22,244 INFO L225 Difference]: With dead ends: 18451 [2023-11-29 00:45:22,244 INFO L226 Difference]: Without dead ends: 18312 [2023-11-29 00:45:22,250 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 402 GetRequests, 318 SyntacticMatches, 0 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1031 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=2691, Invalid=4619, Unknown=0, NotChecked=0, Total=7310 [2023-11-29 00:45:22,250 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 832 mSDsluCounter, 626 mSDsCounter, 0 mSdLazyCounter, 472 mSolverCounterSat, 263 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 832 SdHoareTripleChecker+Valid, 656 SdHoareTripleChecker+Invalid, 735 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 263 IncrementalHoareTripleChecker+Valid, 472 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-11-29 00:45:22,251 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [832 Valid, 656 Invalid, 735 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [263 Valid, 472 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-11-29 00:45:22,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18312 states. [2023-11-29 00:45:29,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18312 to 17977. [2023-11-29 00:45:29,078 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17977 states, 13509 states have (on average 1.284477015323118) internal successors, (17352), 13607 states have internal predecessors, (17352), 4423 states have call successors, (4423), 45 states have call predecessors, (4423), 44 states have return successors, (4422), 4324 states have call predecessors, (4422), 4422 states have call successors, (4422) [2023-11-29 00:45:29,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17977 states to 17977 states and 26197 transitions. [2023-11-29 00:45:29,128 INFO L78 Accepts]: Start accepts. Automaton has 17977 states and 26197 transitions. Word has length 182 [2023-11-29 00:45:29,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-29 00:45:29,128 INFO L495 AbstractCegarLoop]: Abstraction has 17977 states and 26197 transitions. [2023-11-29 00:45:29,129 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 4.434782608695652) internal successors, (204), 46 states have internal predecessors, (204), 43 states have call successors, (45), 23 states have call predecessors, (45), 22 states have return successors, (44), 42 states have call predecessors, (44), 42 states have call successors, (44) [2023-11-29 00:45:29,129 INFO L276 IsEmpty]: Start isEmpty. Operand 17977 states and 26197 transitions. [2023-11-29 00:45:29,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 189 [2023-11-29 00:45:29,142 INFO L187 NwaCegarLoop]: Found error trace [2023-11-29 00:45:29,143 INFO L195 NwaCegarLoop]: trace histogram [22, 21, 21, 10, 10, 10, 10, 8, 7, 7, 7, 6, 5, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-29 00:45:29,148 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2023-11-29 00:45:29,343 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-29 00:45:29,343 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-29 00:45:29,343 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-29 00:45:29,344 INFO L85 PathProgramCache]: Analyzing trace with hash -1351327572, now seen corresponding path program 2 times [2023-11-29 00:45:29,344 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-29 00:45:29,344 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [990051028] [2023-11-29 00:45:29,344 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-29 00:45:29,344 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-29 00:45:29,353 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-29 00:45:29,354 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1852108307] [2023-11-29 00:45:29,354 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2023-11-29 00:45:29,354 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-29 00:45:29,354 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 [2023-11-29 00:45:29,355 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-29 00:45:29,356 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2023-11-29 00:45:29,445 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2023-11-29 00:45:29,446 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-29 00:45:29,448 INFO L262 TraceCheckSpWp]: Trace formula consists of 425 conjuncts, 45 conjunts are in the unsatisfiable core [2023-11-29 00:45:29,452 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-29 00:45:29,785 INFO L134 CoverageAnalysis]: Checked inductivity of 1196 backedges. 50 proven. 1142 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-29 00:45:29,785 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-29 00:45:30,412 INFO L134 CoverageAnalysis]: Checked inductivity of 1196 backedges. 50 proven. 302 refuted. 0 times theorem prover too weak. 844 trivial. 0 not checked. [2023-11-29 00:45:30,412 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-29 00:45:30,412 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [990051028] [2023-11-29 00:45:30,412 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-29 00:45:30,412 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1852108307] [2023-11-29 00:45:30,413 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1852108307] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-29 00:45:30,413 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-29 00:45:30,413 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 25] total 48 [2023-11-29 00:45:30,413 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1011252329] [2023-11-29 00:45:30,413 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-29 00:45:30,414 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2023-11-29 00:45:30,414 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-29 00:45:30,415 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2023-11-29 00:45:30,416 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1040, Invalid=1216, Unknown=0, NotChecked=0, Total=2256 [2023-11-29 00:45:30,417 INFO L87 Difference]: Start difference. First operand 17977 states and 26197 transitions. Second operand has 48 states, 48 states have (on average 4.395833333333333) internal successors, (211), 48 states have internal predecessors, (211), 45 states have call successors, (47), 24 states have call predecessors, (47), 23 states have return successors, (46), 44 states have call predecessors, (46), 44 states have call successors, (46) [2023-11-29 00:45:37,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-29 00:45:37,510 INFO L93 Difference]: Finished difference Result 26990 states and 39801 transitions. [2023-11-29 00:45:37,510 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2023-11-29 00:45:37,511 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 4.395833333333333) internal successors, (211), 48 states have internal predecessors, (211), 45 states have call successors, (47), 24 states have call predecessors, (47), 23 states have return successors, (46), 44 states have call predecessors, (46), 44 states have call successors, (46) Word has length 188 [2023-11-29 00:45:37,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-29 00:45:37,553 INFO L225 Difference]: With dead ends: 26990 [2023-11-29 00:45:37,553 INFO L226 Difference]: Without dead ends: 13466 [2023-11-29 00:45:37,584 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 415 GetRequests, 328 SyntacticMatches, 0 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1094 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=2864, Invalid=4968, Unknown=0, NotChecked=0, Total=7832 [2023-11-29 00:45:37,585 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 899 mSDsluCounter, 554 mSDsCounter, 0 mSdLazyCounter, 456 mSolverCounterSat, 310 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 899 SdHoareTripleChecker+Valid, 584 SdHoareTripleChecker+Invalid, 766 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 310 IncrementalHoareTripleChecker+Valid, 456 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-11-29 00:45:37,585 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [899 Valid, 584 Invalid, 766 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [310 Valid, 456 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-11-29 00:45:37,600 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13466 states. [2023-11-29 00:45:42,564 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13466 to 13198. [2023-11-29 00:45:42,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13198 states, 9907 states have (on average 1.2020793378419299) internal successors, (11909), 9964 states have internal predecessors, (11909), 3244 states have call successors, (3244), 47 states have call predecessors, (3244), 46 states have return successors, (3243), 3186 states have call predecessors, (3243), 3243 states have call successors, (3243) [2023-11-29 00:45:42,615 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13198 states to 13198 states and 18396 transitions. [2023-11-29 00:45:42,617 INFO L78 Accepts]: Start accepts. Automaton has 13198 states and 18396 transitions. Word has length 188 [2023-11-29 00:45:42,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-29 00:45:42,618 INFO L495 AbstractCegarLoop]: Abstraction has 13198 states and 18396 transitions. [2023-11-29 00:45:42,618 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 4.395833333333333) internal successors, (211), 48 states have internal predecessors, (211), 45 states have call successors, (47), 24 states have call predecessors, (47), 23 states have return successors, (46), 44 states have call predecessors, (46), 44 states have call successors, (46) [2023-11-29 00:45:42,619 INFO L276 IsEmpty]: Start isEmpty. Operand 13198 states and 18396 transitions. [2023-11-29 00:45:42,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 195 [2023-11-29 00:45:42,633 INFO L187 NwaCegarLoop]: Found error trace [2023-11-29 00:45:42,633 INFO L195 NwaCegarLoop]: trace histogram [23, 22, 22, 10, 10, 10, 10, 8, 8, 8, 8, 6, 5, 4, 4, 4, 4, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-29 00:45:42,638 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2023-11-29 00:45:42,833 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-29 00:45:42,834 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-29 00:45:42,834 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-29 00:45:42,834 INFO L85 PathProgramCache]: Analyzing trace with hash 1654754227, now seen corresponding path program 2 times [2023-11-29 00:45:42,834 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-29 00:45:42,834 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [785242712] [2023-11-29 00:45:42,834 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-29 00:45:42,834 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-29 00:45:42,845 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-29 00:45:42,845 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [117786598] [2023-11-29 00:45:42,845 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2023-11-29 00:45:42,845 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-29 00:45:42,845 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 [2023-11-29 00:45:42,846 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-29 00:45:42,847 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2023-11-29 00:45:42,952 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2023-11-29 00:45:42,952 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-29 00:45:42,954 INFO L262 TraceCheckSpWp]: Trace formula consists of 435 conjuncts, 47 conjunts are in the unsatisfiable core [2023-11-29 00:45:42,957 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-29 00:45:43,422 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 44 proven. 1248 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-29 00:45:43,422 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-29 00:45:44,138 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 44 proven. 324 refuted. 0 times theorem prover too weak. 928 trivial. 0 not checked. [2023-11-29 00:45:44,138 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-29 00:45:44,139 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [785242712] [2023-11-29 00:45:44,139 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-29 00:45:44,139 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [117786598] [2023-11-29 00:45:44,139 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [117786598] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-29 00:45:44,139 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-29 00:45:44,139 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 26] total 50 [2023-11-29 00:45:44,139 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [134122827] [2023-11-29 00:45:44,139 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-29 00:45:44,140 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2023-11-29 00:45:44,140 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-29 00:45:44,141 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2023-11-29 00:45:44,142 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1133, Invalid=1317, Unknown=0, NotChecked=0, Total=2450 [2023-11-29 00:45:44,143 INFO L87 Difference]: Start difference. First operand 13198 states and 18396 transitions. Second operand has 50 states, 50 states have (on average 4.36) internal successors, (218), 50 states have internal predecessors, (218), 47 states have call successors, (49), 25 states have call predecessors, (49), 24 states have return successors, (48), 46 states have call predecessors, (48), 46 states have call successors, (48) [2023-11-29 00:45:51,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-29 00:45:51,314 INFO L93 Difference]: Finished difference Result 14257 states and 19984 transitions. [2023-11-29 00:45:51,315 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2023-11-29 00:45:51,315 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 4.36) internal successors, (218), 50 states have internal predecessors, (218), 47 states have call successors, (49), 25 states have call predecessors, (49), 24 states have return successors, (48), 46 states have call predecessors, (48), 46 states have call successors, (48) Word has length 194 [2023-11-29 00:45:51,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-29 00:45:51,341 INFO L225 Difference]: With dead ends: 14257 [2023-11-29 00:45:51,341 INFO L226 Difference]: Without dead ends: 14108 [2023-11-29 00:45:51,346 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 428 GetRequests, 338 SyntacticMatches, 0 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1159 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=3046, Invalid=5326, Unknown=0, NotChecked=0, Total=8372 [2023-11-29 00:45:51,346 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 847 mSDsluCounter, 537 mSDsCounter, 0 mSdLazyCounter, 462 mSolverCounterSat, 372 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 847 SdHoareTripleChecker+Valid, 567 SdHoareTripleChecker+Invalid, 834 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 372 IncrementalHoareTripleChecker+Valid, 462 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-11-29 00:45:51,347 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [847 Valid, 567 Invalid, 834 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [372 Valid, 462 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-11-29 00:45:51,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14108 states. [2023-11-29 00:45:56,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14108 to 13324. [2023-11-29 00:45:56,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13324 states, 10008 states have (on average 1.1423860911270982) internal successors, (11433), 10087 states have internal predecessors, (11433), 3267 states have call successors, (3267), 49 states have call predecessors, (3267), 48 states have return successors, (3266), 3187 states have call predecessors, (3266), 3266 states have call successors, (3266) [2023-11-29 00:45:56,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13324 states to 13324 states and 17966 transitions. [2023-11-29 00:45:56,365 INFO L78 Accepts]: Start accepts. Automaton has 13324 states and 17966 transitions. Word has length 194 [2023-11-29 00:45:56,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-29 00:45:56,365 INFO L495 AbstractCegarLoop]: Abstraction has 13324 states and 17966 transitions. [2023-11-29 00:45:56,366 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 4.36) internal successors, (218), 50 states have internal predecessors, (218), 47 states have call successors, (49), 25 states have call predecessors, (49), 24 states have return successors, (48), 46 states have call predecessors, (48), 46 states have call successors, (48) [2023-11-29 00:45:56,366 INFO L276 IsEmpty]: Start isEmpty. Operand 13324 states and 17966 transitions. [2023-11-29 00:45:56,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 375 [2023-11-29 00:45:56,400 INFO L187 NwaCegarLoop]: Found error trace [2023-11-29 00:45:56,401 INFO L195 NwaCegarLoop]: trace histogram [45, 44, 44, 20, 19, 19, 19, 17, 16, 16, 16, 11, 10, 9, 9, 9, 9, 8, 8, 8, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-29 00:45:56,405 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2023-11-29 00:45:56,601 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-29 00:45:56,601 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-29 00:45:56,601 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-29 00:45:56,602 INFO L85 PathProgramCache]: Analyzing trace with hash 1553063089, now seen corresponding path program 10 times [2023-11-29 00:45:56,602 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-29 00:45:56,602 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [700365216] [2023-11-29 00:45:56,602 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-29 00:45:56,602 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-29 00:45:56,624 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-29 00:45:56,624 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [39200864] [2023-11-29 00:45:56,624 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-29 00:45:56,625 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-29 00:45:56,625 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 [2023-11-29 00:45:56,626 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-29 00:45:56,627 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2023-11-29 00:45:56,772 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-29 00:45:56,772 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-29 00:45:56,775 INFO L262 TraceCheckSpWp]: Trace formula consists of 739 conjuncts, 32 conjunts are in the unsatisfiable core [2023-11-29 00:45:56,783 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-29 00:45:57,246 INFO L134 CoverageAnalysis]: Checked inductivity of 5272 backedges. 416 proven. 1164 refuted. 0 times theorem prover too weak. 3692 trivial. 0 not checked. [2023-11-29 00:45:57,246 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-29 00:45:57,934 INFO L134 CoverageAnalysis]: Checked inductivity of 5272 backedges. 266 proven. 1204 refuted. 0 times theorem prover too weak. 3802 trivial. 0 not checked. [2023-11-29 00:45:57,934 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-29 00:45:57,934 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [700365216] [2023-11-29 00:45:57,934 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-29 00:45:57,934 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [39200864] [2023-11-29 00:45:57,935 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [39200864] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-29 00:45:57,935 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-29 00:45:57,935 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 32 [2023-11-29 00:45:57,935 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1256642091] [2023-11-29 00:45:57,935 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-29 00:45:57,936 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2023-11-29 00:45:57,936 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-29 00:45:57,937 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2023-11-29 00:45:57,938 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=888, Unknown=0, NotChecked=0, Total=992 [2023-11-29 00:45:57,938 INFO L87 Difference]: Start difference. First operand 13324 states and 17966 transitions. Second operand has 32 states, 32 states have (on average 7.40625) internal successors, (237), 32 states have internal predecessors, (237), 32 states have call successors, (75), 2 states have call predecessors, (75), 2 states have return successors, (74), 32 states have call predecessors, (74), 32 states have call successors, (74) [2023-11-29 00:46:06,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-29 00:46:06,171 INFO L93 Difference]: Finished difference Result 17391 states and 23399 transitions. [2023-11-29 00:46:06,171 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2023-11-29 00:46:06,171 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 7.40625) internal successors, (237), 32 states have internal predecessors, (237), 32 states have call successors, (75), 2 states have call predecessors, (75), 2 states have return successors, (74), 32 states have call predecessors, (74), 32 states have call successors, (74) Word has length 374 [2023-11-29 00:46:06,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-29 00:46:06,209 INFO L225 Difference]: With dead ends: 17391 [2023-11-29 00:46:06,210 INFO L226 Difference]: Without dead ends: 15454 [2023-11-29 00:46:06,220 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 778 GetRequests, 716 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 606 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=623, Invalid=3409, Unknown=0, NotChecked=0, Total=4032 [2023-11-29 00:46:06,221 INFO L413 NwaCegarLoop]: 270 mSDtfsCounter, 371 mSDsluCounter, 3986 mSDsCounter, 0 mSdLazyCounter, 1801 mSolverCounterSat, 111 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 377 SdHoareTripleChecker+Valid, 4256 SdHoareTripleChecker+Invalid, 1912 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 111 IncrementalHoareTripleChecker+Valid, 1801 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2023-11-29 00:46:06,221 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [377 Valid, 4256 Invalid, 1912 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [111 Valid, 1801 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2023-11-29 00:46:06,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15454 states. [2023-11-29 00:46:11,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15454 to 13449. [2023-11-29 00:46:11,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13449 states, 10102 states have (on average 1.1424470401900613) internal successors, (11541), 10182 states have internal predecessors, (11541), 3298 states have call successors, (3298), 49 states have call predecessors, (3298), 48 states have return successors, (3297), 3217 states have call predecessors, (3297), 3297 states have call successors, (3297) [2023-11-29 00:46:11,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13449 states to 13449 states and 18136 transitions. [2023-11-29 00:46:11,562 INFO L78 Accepts]: Start accepts. Automaton has 13449 states and 18136 transitions. Word has length 374 [2023-11-29 00:46:11,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-29 00:46:11,563 INFO L495 AbstractCegarLoop]: Abstraction has 13449 states and 18136 transitions. [2023-11-29 00:46:11,563 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 7.40625) internal successors, (237), 32 states have internal predecessors, (237), 32 states have call successors, (75), 2 states have call predecessors, (75), 2 states have return successors, (74), 32 states have call predecessors, (74), 32 states have call successors, (74) [2023-11-29 00:46:11,563 INFO L276 IsEmpty]: Start isEmpty. Operand 13449 states and 18136 transitions. [2023-11-29 00:46:11,586 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 375 [2023-11-29 00:46:11,586 INFO L187 NwaCegarLoop]: Found error trace [2023-11-29 00:46:11,587 INFO L195 NwaCegarLoop]: trace histogram [45, 44, 44, 20, 19, 19, 19, 17, 16, 16, 16, 11, 10, 9, 9, 9, 9, 8, 8, 8, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-29 00:46:11,592 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2023-11-29 00:46:11,787 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-29 00:46:11,787 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-29 00:46:11,787 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-29 00:46:11,788 INFO L85 PathProgramCache]: Analyzing trace with hash -217013071, now seen corresponding path program 11 times [2023-11-29 00:46:11,788 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-29 00:46:11,788 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1297706705] [2023-11-29 00:46:11,788 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-29 00:46:11,788 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-29 00:46:11,804 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-29 00:46:11,804 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [157765743] [2023-11-29 00:46:11,804 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2023-11-29 00:46:11,804 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-29 00:46:11,805 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 [2023-11-29 00:46:11,806 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-29 00:46:11,807 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2023-11-29 00:46:12,607 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 25 check-sat command(s) [2023-11-29 00:46:12,607 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-29 00:46:12,613 INFO L262 TraceCheckSpWp]: Trace formula consists of 811 conjuncts, 34 conjunts are in the unsatisfiable core [2023-11-29 00:46:12,618 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-29 00:46:13,051 INFO L134 CoverageAnalysis]: Checked inductivity of 5272 backedges. 176 proven. 1296 refuted. 0 times theorem prover too weak. 3800 trivial. 0 not checked. [2023-11-29 00:46:13,051 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-29 00:46:13,960 INFO L134 CoverageAnalysis]: Checked inductivity of 5272 backedges. 376 proven. 1096 refuted. 0 times theorem prover too weak. 3800 trivial. 0 not checked. [2023-11-29 00:46:13,960 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-29 00:46:13,960 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1297706705] [2023-11-29 00:46:13,960 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-29 00:46:13,960 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [157765743] [2023-11-29 00:46:13,960 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [157765743] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-29 00:46:13,960 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-29 00:46:13,961 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 35 [2023-11-29 00:46:13,961 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [522344043] [2023-11-29 00:46:13,961 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-29 00:46:13,962 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2023-11-29 00:46:13,962 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-29 00:46:13,963 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2023-11-29 00:46:13,963 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=162, Invalid=1028, Unknown=0, NotChecked=0, Total=1190 [2023-11-29 00:46:13,964 INFO L87 Difference]: Start difference. First operand 13449 states and 18136 transitions. Second operand has 35 states, 35 states have (on average 7.257142857142857) internal successors, (254), 35 states have internal predecessors, (254), 35 states have call successors, (80), 2 states have call predecessors, (80), 1 states have return successors, (79), 34 states have call predecessors, (79), 34 states have call successors, (79) [2023-11-29 00:46:30,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-29 00:46:30,284 INFO L93 Difference]: Finished difference Result 23382 states and 31390 transitions. [2023-11-29 00:46:30,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 106 states. [2023-11-29 00:46:30,284 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 7.257142857142857) internal successors, (254), 35 states have internal predecessors, (254), 35 states have call successors, (80), 2 states have call predecessors, (80), 1 states have return successors, (79), 34 states have call predecessors, (79), 34 states have call successors, (79) Word has length 374 [2023-11-29 00:46:30,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-29 00:46:30,334 INFO L225 Difference]: With dead ends: 23382 [2023-11-29 00:46:30,334 INFO L226 Difference]: Without dead ends: 21728 [2023-11-29 00:46:30,343 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 828 GetRequests, 711 SyntacticMatches, 2 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3277 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=2059, Invalid=11513, Unknown=0, NotChecked=0, Total=13572 [2023-11-29 00:46:30,344 INFO L413 NwaCegarLoop]: 361 mSDtfsCounter, 636 mSDsluCounter, 6427 mSDsCounter, 0 mSdLazyCounter, 3066 mSolverCounterSat, 174 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 650 SdHoareTripleChecker+Valid, 6788 SdHoareTripleChecker+Invalid, 3240 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 174 IncrementalHoareTripleChecker+Valid, 3066 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2023-11-29 00:46:30,344 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [650 Valid, 6788 Invalid, 3240 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [174 Valid, 3066 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2023-11-29 00:46:30,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21728 states. [2023-11-29 00:46:37,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21728 to 17218. [2023-11-29 00:46:37,917 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17218 states, 12929 states have (on average 1.1346585196070849) internal successors, (14670), 13042 states have internal predecessors, (14670), 4240 states have call successors, (4240), 49 states have call predecessors, (4240), 48 states have return successors, (4239), 4126 states have call predecessors, (4239), 4239 states have call successors, (4239) [2023-11-29 00:46:37,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17218 states to 17218 states and 23149 transitions. [2023-11-29 00:46:37,949 INFO L78 Accepts]: Start accepts. Automaton has 17218 states and 23149 transitions. Word has length 374 [2023-11-29 00:46:37,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-29 00:46:37,950 INFO L495 AbstractCegarLoop]: Abstraction has 17218 states and 23149 transitions. [2023-11-29 00:46:37,950 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 7.257142857142857) internal successors, (254), 35 states have internal predecessors, (254), 35 states have call successors, (80), 2 states have call predecessors, (80), 1 states have return successors, (79), 34 states have call predecessors, (79), 34 states have call successors, (79) [2023-11-29 00:46:37,950 INFO L276 IsEmpty]: Start isEmpty. Operand 17218 states and 23149 transitions. [2023-11-29 00:46:37,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 375 [2023-11-29 00:46:37,993 INFO L187 NwaCegarLoop]: Found error trace [2023-11-29 00:46:37,993 INFO L195 NwaCegarLoop]: trace histogram [45, 44, 44, 20, 19, 19, 19, 17, 16, 16, 16, 11, 10, 9, 9, 9, 9, 8, 8, 8, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-29 00:46:37,999 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2023-11-29 00:46:38,194 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2023-11-29 00:46:38,194 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-29 00:46:38,194 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-29 00:46:38,194 INFO L85 PathProgramCache]: Analyzing trace with hash -29226831, now seen corresponding path program 12 times [2023-11-29 00:46:38,194 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-29 00:46:38,194 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [805658547] [2023-11-29 00:46:38,194 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-29 00:46:38,194 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-29 00:46:38,216 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-29 00:46:38,217 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [535030606] [2023-11-29 00:46:38,217 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2023-11-29 00:46:38,217 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-29 00:46:38,217 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 [2023-11-29 00:46:38,218 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-29 00:46:38,219 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9bfcd8-bf10-4392-be34-66f0e190a733/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process