./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_unwindbound10.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 527bcce2 Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_unwindbound10.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5 --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 76fd23ddcb7e8fff12decb053b84ed59e907e32bdbc4e822256bdb820e1311ef --- Real Ultimate output --- This is Ultimate 0.2.3-dev-527bcce [2023-11-21 19:44:58,574 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-21 19:44:58,687 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-21 19:44:58,694 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-21 19:44:58,695 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-21 19:44:58,731 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-21 19:44:58,732 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-21 19:44:58,732 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-21 19:44:58,733 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-21 19:44:58,738 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-21 19:44:58,739 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-21 19:44:58,739 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-21 19:44:58,740 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-21 19:44:58,742 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-21 19:44:58,742 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-21 19:44:58,742 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-21 19:44:58,743 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-21 19:44:58,743 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-21 19:44:58,744 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-21 19:44:58,744 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-21 19:44:58,745 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-21 19:44:58,745 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-21 19:44:58,747 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-21 19:44:58,747 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-21 19:44:58,748 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-21 19:44:58,748 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-21 19:44:58,748 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-21 19:44:58,749 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-21 19:44:58,749 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-21 19:44:58,750 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-21 19:44:58,751 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-21 19:44:58,751 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-21 19:44:58,752 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-21 19:44:58,752 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-21 19:44:58,752 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-21 19:44:58,753 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-21 19:44:58,753 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-21 19:44:58,753 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-21 19:44:58,754 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-21 19:44:58,754 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-21 19:44:58,754 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-21 19:44:58,755 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-21 19:44:58,755 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-21 19:44:58,755 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-21 19:44:58,756 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-21 19:44:58,756 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-21 19:44:58,756 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-21 19:44:58,757 INFO L153 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 76fd23ddcb7e8fff12decb053b84ed59e907e32bdbc4e822256bdb820e1311ef [2023-11-21 19:44:59,095 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-21 19:44:59,119 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-21 19:44:59,123 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-21 19:44:59,126 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-21 19:44:59,126 INFO L274 PluginConnector]: CDTParser initialized [2023-11-21 19:44:59,128 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_unwindbound10.c [2023-11-21 19:45:02,298 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-21 19:45:02,550 INFO L384 CDTParser]: Found 1 translation units. [2023-11-21 19:45:02,550 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_unwindbound10.c [2023-11-21 19:45:02,559 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/data/c0a47ad3c/44850454208b48a1a257462ea8d57b1b/FLAG42c453190 [2023-11-21 19:45:02,573 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/data/c0a47ad3c/44850454208b48a1a257462ea8d57b1b [2023-11-21 19:45:02,576 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-21 19:45:02,578 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-21 19:45:02,579 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-21 19:45:02,580 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-21 19:45:02,585 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-21 19:45:02,586 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 07:45:02" (1/1) ... [2023-11-21 19:45:02,587 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@331cd982 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:45:02, skipping insertion in model container [2023-11-21 19:45:02,587 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 07:45:02" (1/1) ... [2023-11-21 19:45:02,610 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-21 19:45:02,781 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_2add206e-df3b-49fa-bb49-776985d34b23/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_unwindbound10.c[490,503] [2023-11-21 19:45:02,803 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-21 19:45:02,817 INFO L202 MainTranslator]: Completed pre-run [2023-11-21 19:45:02,828 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_2add206e-df3b-49fa-bb49-776985d34b23/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_unwindbound10.c[490,503] [2023-11-21 19:45:02,839 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-21 19:45:02,854 INFO L206 MainTranslator]: Completed translation [2023-11-21 19:45:02,854 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:45:02 WrapperNode [2023-11-21 19:45:02,854 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-21 19:45:02,855 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-21 19:45:02,855 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-21 19:45:02,856 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-21 19:45:02,863 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:45:02" (1/1) ... [2023-11-21 19:45:02,869 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:45:02" (1/1) ... [2023-11-21 19:45:02,888 INFO L138 Inliner]: procedures = 14, calls = 14, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 94 [2023-11-21 19:45:02,888 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-21 19:45:02,889 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-21 19:45:02,889 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-21 19:45:02,889 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-21 19:45:02,898 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:45:02" (1/1) ... [2023-11-21 19:45:02,898 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:45:02" (1/1) ... [2023-11-21 19:45:02,900 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:45:02" (1/1) ... [2023-11-21 19:45:02,901 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:45:02" (1/1) ... [2023-11-21 19:45:02,905 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:45:02" (1/1) ... [2023-11-21 19:45:02,909 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:45:02" (1/1) ... [2023-11-21 19:45:02,910 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:45:02" (1/1) ... [2023-11-21 19:45:02,911 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:45:02" (1/1) ... [2023-11-21 19:45:02,914 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-21 19:45:02,915 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-21 19:45:02,915 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-21 19:45:02,915 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-21 19:45:02,916 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:45:02" (1/1) ... [2023-11-21 19:45:02,925 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-21 19:45:02,947 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:45:02,967 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-21 19:45:02,969 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-21 19:45:03,008 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-21 19:45:03,008 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-11-21 19:45:03,009 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-11-21 19:45:03,009 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-21 19:45:03,009 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-21 19:45:03,009 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-21 19:45:03,009 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-11-21 19:45:03,009 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-11-21 19:45:03,077 INFO L240 CfgBuilder]: Building ICFG [2023-11-21 19:45:03,079 INFO L266 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-21 19:45:03,349 INFO L281 CfgBuilder]: Performing block encoding [2023-11-21 19:45:03,380 INFO L303 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-21 19:45:03,381 INFO L308 CfgBuilder]: Removed 3 assume(true) statements. [2023-11-21 19:45:03,382 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 07:45:03 BoogieIcfgContainer [2023-11-21 19:45:03,383 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-21 19:45:03,386 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-21 19:45:03,386 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-21 19:45:03,390 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-21 19:45:03,390 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 07:45:02" (1/3) ... [2023-11-21 19:45:03,391 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@77feafad and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 07:45:03, skipping insertion in model container [2023-11-21 19:45:03,391 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:45:02" (2/3) ... [2023-11-21 19:45:03,392 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@77feafad and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 07:45:03, skipping insertion in model container [2023-11-21 19:45:03,392 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 07:45:03" (3/3) ... [2023-11-21 19:45:03,393 INFO L112 eAbstractionObserver]: Analyzing ICFG egcd3-ll_unwindbound10.c [2023-11-21 19:45:03,413 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-21 19:45:03,413 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-21 19:45:03,461 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-21 19:45:03,471 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopHeads, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@57f7fef, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-21 19:45:03,472 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-21 19:45:03,477 INFO L276 IsEmpty]: Start isEmpty. Operand has 30 states, 19 states have (on average 1.5789473684210527) internal successors, (30), 20 states have internal predecessors, (30), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2023-11-21 19:45:03,502 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-11-21 19:45:03,502 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:45:03,503 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:45:03,504 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:45:03,509 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:45:03,510 INFO L85 PathProgramCache]: Analyzing trace with hash 1826888722, now seen corresponding path program 1 times [2023-11-21 19:45:03,520 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:45:03,520 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [549755754] [2023-11-21 19:45:03,521 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:03,521 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:45:03,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:03,682 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:45:03,683 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [549755754] [2023-11-21 19:45:03,683 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2023-11-21 19:45:03,684 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1842404552] [2023-11-21 19:45:03,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:03,684 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:45:03,684 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:45:03,690 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:45:03,693 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-21 19:45:03,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:03,808 INFO L262 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 1 conjunts are in the unsatisfiable core [2023-11-21 19:45:03,813 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:45:03,844 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-21 19:45:03,844 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-21 19:45:03,846 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1842404552] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:45:03,846 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:45:03,846 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-21 19:45:03,850 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1752204440] [2023-11-21 19:45:03,851 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:45:03,856 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-11-21 19:45:03,856 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:45:03,898 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-11-21 19:45:03,899 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-11-21 19:45:03,901 INFO L87 Difference]: Start difference. First operand has 30 states, 19 states have (on average 1.5789473684210527) internal successors, (30), 20 states have internal predecessors, (30), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Second operand has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-21 19:45:03,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:45:03,935 INFO L93 Difference]: Finished difference Result 54 states and 86 transitions. [2023-11-21 19:45:03,937 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-11-21 19:45:03,938 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 13 [2023-11-21 19:45:03,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:45:03,946 INFO L225 Difference]: With dead ends: 54 [2023-11-21 19:45:03,947 INFO L226 Difference]: Without dead ends: 28 [2023-11-21 19:45:03,950 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-11-21 19:45:03,958 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 3 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-21 19:45:03,960 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 37 Invalid, 3 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-21 19:45:03,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2023-11-21 19:45:04,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2023-11-21 19:45:04,007 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 19 states have internal predecessors, (25), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-11-21 19:45:04,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 38 transitions. [2023-11-21 19:45:04,011 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 38 transitions. Word has length 13 [2023-11-21 19:45:04,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:45:04,014 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 38 transitions. [2023-11-21 19:45:04,015 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-21 19:45:04,016 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 38 transitions. [2023-11-21 19:45:04,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-11-21 19:45:04,018 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:45:04,019 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:45:04,049 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-21 19:45:04,240 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:45:04,241 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:45:04,242 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:45:04,242 INFO L85 PathProgramCache]: Analyzing trace with hash -828509657, now seen corresponding path program 1 times [2023-11-21 19:45:04,242 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:45:04,243 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1348853248] [2023-11-21 19:45:04,243 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:04,243 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:45:04,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:04,289 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:45:04,289 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1348853248] [2023-11-21 19:45:04,289 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2023-11-21 19:45:04,290 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1700520993] [2023-11-21 19:45:04,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:04,290 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:45:04,291 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:45:04,292 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:45:04,317 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-21 19:45:04,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:04,375 INFO L262 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-21 19:45:04,382 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:45:04,471 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-21 19:45:04,471 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-21 19:45:04,472 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1700520993] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:45:04,472 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:45:04,472 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-21 19:45:04,473 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [794523306] [2023-11-21 19:45:04,473 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:45:04,474 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-21 19:45:04,474 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:45:04,475 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-21 19:45:04,475 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-21 19:45:04,475 INFO L87 Difference]: Start difference. First operand 28 states and 38 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-21 19:45:04,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:45:04,503 INFO L93 Difference]: Finished difference Result 37 states and 47 transitions. [2023-11-21 19:45:04,503 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-21 19:45:04,504 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 14 [2023-11-21 19:45:04,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:45:04,505 INFO L225 Difference]: With dead ends: 37 [2023-11-21 19:45:04,506 INFO L226 Difference]: Without dead ends: 30 [2023-11-21 19:45:04,506 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-21 19:45:04,508 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 0 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 94 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-21 19:45:04,508 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 94 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-21 19:45:04,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2023-11-21 19:45:04,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2023-11-21 19:45:04,515 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 20 states have (on average 1.35) internal successors, (27), 21 states have internal predecessors, (27), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-11-21 19:45:04,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 40 transitions. [2023-11-21 19:45:04,517 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 40 transitions. Word has length 14 [2023-11-21 19:45:04,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:45:04,518 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 40 transitions. [2023-11-21 19:45:04,518 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-21 19:45:04,518 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 40 transitions. [2023-11-21 19:45:04,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-11-21 19:45:04,519 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:45:04,519 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:45:04,534 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-21 19:45:04,724 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:45:04,725 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:45:04,726 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:45:04,726 INFO L85 PathProgramCache]: Analyzing trace with hash 66369279, now seen corresponding path program 1 times [2023-11-21 19:45:04,726 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:45:04,726 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [983641394] [2023-11-21 19:45:04,726 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:04,727 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:45:04,753 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-21 19:45:04,758 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1216139222] [2023-11-21 19:45:04,759 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:04,760 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:45:04,760 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:45:04,761 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:45:04,786 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-21 19:45:04,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:04,840 INFO L262 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 17 conjunts are in the unsatisfiable core [2023-11-21 19:45:04,842 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:45:05,079 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-21 19:45:05,079 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-21 19:45:05,080 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:45:05,080 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [983641394] [2023-11-21 19:45:05,080 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-21 19:45:05,080 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1216139222] [2023-11-21 19:45:05,081 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1216139222] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:45:05,081 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:45:05,081 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-21 19:45:05,081 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1190531661] [2023-11-21 19:45:05,081 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:45:05,082 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-21 19:45:05,082 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:45:05,083 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-21 19:45:05,083 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-21 19:45:05,083 INFO L87 Difference]: Start difference. First operand 30 states and 40 transitions. Second operand has 6 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-21 19:45:05,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:45:05,221 INFO L93 Difference]: Finished difference Result 50 states and 68 transitions. [2023-11-21 19:45:05,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-21 19:45:05,222 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 15 [2023-11-21 19:45:05,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:45:05,223 INFO L225 Difference]: With dead ends: 50 [2023-11-21 19:45:05,224 INFO L226 Difference]: Without dead ends: 47 [2023-11-21 19:45:05,224 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2023-11-21 19:45:05,226 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 18 mSDsluCounter, 117 mSDsCounter, 0 mSdLazyCounter, 61 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 149 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 61 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-21 19:45:05,226 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 149 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 61 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-21 19:45:05,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2023-11-21 19:45:05,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 46. [2023-11-21 19:45:05,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 31 states have (on average 1.3548387096774193) internal successors, (42), 32 states have internal predecessors, (42), 11 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2023-11-21 19:45:05,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 63 transitions. [2023-11-21 19:45:05,242 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 63 transitions. Word has length 15 [2023-11-21 19:45:05,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:45:05,242 INFO L495 AbstractCegarLoop]: Abstraction has 46 states and 63 transitions. [2023-11-21 19:45:05,243 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-21 19:45:05,243 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 63 transitions. [2023-11-21 19:45:05,244 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-11-21 19:45:05,244 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:45:05,244 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:45:05,276 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-21 19:45:05,460 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:45:05,461 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:45:05,461 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:45:05,462 INFO L85 PathProgramCache]: Analyzing trace with hash -1737104877, now seen corresponding path program 1 times [2023-11-21 19:45:05,462 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:45:05,462 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [135138643] [2023-11-21 19:45:05,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:05,462 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:45:05,482 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-21 19:45:05,483 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [592864594] [2023-11-21 19:45:05,483 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:05,483 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:45:05,483 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:45:05,485 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:45:05,489 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-21 19:45:05,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:05,551 INFO L262 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-21 19:45:05,559 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:45:05,599 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-21 19:45:05,599 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-21 19:45:05,599 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:45:05,599 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [135138643] [2023-11-21 19:45:05,600 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-21 19:45:05,600 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [592864594] [2023-11-21 19:45:05,600 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [592864594] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:45:05,600 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:45:05,601 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-21 19:45:05,601 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [164825260] [2023-11-21 19:45:05,601 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:45:05,602 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-21 19:45:05,602 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:45:05,602 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-21 19:45:05,603 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-21 19:45:05,603 INFO L87 Difference]: Start difference. First operand 46 states and 63 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (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) [2023-11-21 19:45:05,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:45:05,631 INFO L93 Difference]: Finished difference Result 70 states and 97 transitions. [2023-11-21 19:45:05,631 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-21 19:45:05,632 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (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 20 [2023-11-21 19:45:05,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:45:05,634 INFO L225 Difference]: With dead ends: 70 [2023-11-21 19:45:05,634 INFO L226 Difference]: Without dead ends: 48 [2023-11-21 19:45:05,635 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-21 19:45:05,636 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 0 mSDsluCounter, 61 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 94 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 [2023-11-21 19:45:05,637 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 94 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-21 19:45:05,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2023-11-21 19:45:05,647 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2023-11-21 19:45:05,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 33 states have (on average 1.3333333333333333) internal successors, (44), 34 states have internal predecessors, (44), 11 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2023-11-21 19:45:05,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 65 transitions. [2023-11-21 19:45:05,650 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 65 transitions. Word has length 20 [2023-11-21 19:45:05,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:45:05,650 INFO L495 AbstractCegarLoop]: Abstraction has 48 states and 65 transitions. [2023-11-21 19:45:05,651 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (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) [2023-11-21 19:45:05,651 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 65 transitions. [2023-11-21 19:45:05,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-11-21 19:45:05,652 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:45:05,652 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:45:05,682 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-21 19:45:05,872 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:45:05,873 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:45:05,873 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:45:05,873 INFO L85 PathProgramCache]: Analyzing trace with hash -1894324762, now seen corresponding path program 1 times [2023-11-21 19:45:05,874 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:45:05,874 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [266087152] [2023-11-21 19:45:05,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:05,874 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:45:05,890 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-21 19:45:05,891 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1546819135] [2023-11-21 19:45:05,891 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:05,891 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:45:05,891 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:45:05,892 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:45:05,908 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-21 19:45:05,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:05,970 INFO L262 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 7 conjunts are in the unsatisfiable core [2023-11-21 19:45:05,972 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:45:06,026 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-21 19:45:06,026 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:45:06,096 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-21 19:45:06,096 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:45:06,096 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [266087152] [2023-11-21 19:45:06,097 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-21 19:45:06,097 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1546819135] [2023-11-21 19:45:06,097 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1546819135] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:45:06,097 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1165947314] [2023-11-21 19:45:06,118 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-11-21 19:45:06,118 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:45:06,122 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-21 19:45:06,128 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-21 19:45:06,128 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-21 19:45:07,779 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 11 iterations. Over-approximation may be very coarse. [2023-11-21 19:45:07,873 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 64 for LOIs [2023-11-21 19:45:07,941 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-21 19:45:09,949 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [1165947314] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:45:09,950 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-11-21 19:45:09,950 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [5, 6] total 22 [2023-11-21 19:45:09,951 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1838359659] [2023-11-21 19:45:09,951 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:45:09,952 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-11-21 19:45:09,952 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:45:09,953 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-11-21 19:45:09,954 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=340, Unknown=0, NotChecked=0, Total=462 [2023-11-21 19:45:09,955 INFO L87 Difference]: Start difference. First operand 48 states and 65 transitions. Second operand has 14 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 10 states have internal predecessors, (14), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-21 19:45:10,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:45:10,479 INFO L93 Difference]: Finished difference Result 80 states and 111 transitions. [2023-11-21 19:45:10,479 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-11-21 19:45:10,480 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 10 states have internal predecessors, (14), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 21 [2023-11-21 19:45:10,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:45:10,483 INFO L225 Difference]: With dead ends: 80 [2023-11-21 19:45:10,484 INFO L226 Difference]: Without dead ends: 58 [2023-11-21 19:45:10,485 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 165 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=142, Invalid=410, Unknown=0, NotChecked=0, Total=552 [2023-11-21 19:45:10,488 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 3 mSDsluCounter, 131 mSDsCounter, 0 mSdLazyCounter, 120 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 155 SdHoareTripleChecker+Invalid, 123 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 120 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-21 19:45:10,489 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 155 Invalid, 123 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 120 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-21 19:45:10,490 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2023-11-21 19:45:10,510 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 56. [2023-11-21 19:45:10,511 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 41 states have (on average 1.3170731707317074) internal successors, (54), 42 states have internal predecessors, (54), 11 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2023-11-21 19:45:10,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 75 transitions. [2023-11-21 19:45:10,515 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 75 transitions. Word has length 21 [2023-11-21 19:45:10,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:45:10,516 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 75 transitions. [2023-11-21 19:45:10,517 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 10 states have internal predecessors, (14), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-21 19:45:10,518 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 75 transitions. [2023-11-21 19:45:10,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-11-21 19:45:10,520 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:45:10,520 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:45:10,549 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-21 19:45:10,740 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:45:10,741 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:45:10,741 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:45:10,741 INFO L85 PathProgramCache]: Analyzing trace with hash 692243834, now seen corresponding path program 1 times [2023-11-21 19:45:10,742 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:45:10,742 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [736524687] [2023-11-21 19:45:10,742 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:10,742 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:45:10,757 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-21 19:45:10,757 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1051398108] [2023-11-21 19:45:10,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:10,757 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:45:10,758 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:45:10,758 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:45:10,780 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-21 19:45:10,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:10,819 INFO L262 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 7 conjunts are in the unsatisfiable core [2023-11-21 19:45:10,822 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:45:10,862 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-21 19:45:10,862 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-21 19:45:10,862 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:45:10,862 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [736524687] [2023-11-21 19:45:10,862 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-21 19:45:10,863 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1051398108] [2023-11-21 19:45:10,863 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1051398108] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:45:10,863 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:45:10,863 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-21 19:45:10,863 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1240044765] [2023-11-21 19:45:10,863 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:45:10,864 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-21 19:45:10,864 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:45:10,864 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-21 19:45:10,864 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2023-11-21 19:45:10,865 INFO L87 Difference]: Start difference. First operand 56 states and 75 transitions. Second operand has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 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) [2023-11-21 19:45:10,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:45:10,904 INFO L93 Difference]: Finished difference Result 97 states and 133 transitions. [2023-11-21 19:45:10,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-21 19:45:10,905 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 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 26 [2023-11-21 19:45:10,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:45:10,906 INFO L225 Difference]: With dead ends: 97 [2023-11-21 19:45:10,906 INFO L226 Difference]: Without dead ends: 60 [2023-11-21 19:45:10,907 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2023-11-21 19:45:10,908 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 2 mSDsluCounter, 112 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 144 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-21 19:45:10,908 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 144 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-21 19:45:10,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2023-11-21 19:45:10,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 58. [2023-11-21 19:45:10,936 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 43 states have (on average 1.302325581395349) internal successors, (56), 44 states have internal predecessors, (56), 11 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2023-11-21 19:45:10,937 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 77 transitions. [2023-11-21 19:45:10,937 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 77 transitions. Word has length 26 [2023-11-21 19:45:10,938 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:45:10,938 INFO L495 AbstractCegarLoop]: Abstraction has 58 states and 77 transitions. [2023-11-21 19:45:10,938 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 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) [2023-11-21 19:45:10,938 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 77 transitions. [2023-11-21 19:45:10,940 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2023-11-21 19:45:10,940 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:45:10,940 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:45:10,966 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-21 19:45:11,166 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-11-21 19:45:11,166 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:45:11,167 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:45:11,167 INFO L85 PathProgramCache]: Analyzing trace with hash -1856138177, now seen corresponding path program 1 times [2023-11-21 19:45:11,167 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:45:11,167 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1413218281] [2023-11-21 19:45:11,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:11,168 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:45:11,194 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-21 19:45:11,194 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1338842282] [2023-11-21 19:45:11,194 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:11,195 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:45:11,195 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:45:11,200 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:45:11,212 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-21 19:45:11,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:11,263 INFO L262 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 15 conjunts are in the unsatisfiable core [2023-11-21 19:45:11,265 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:45:11,391 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-21 19:45:11,391 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:45:11,538 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-21 19:45:11,538 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:45:11,538 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1413218281] [2023-11-21 19:45:11,538 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-21 19:45:11,538 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1338842282] [2023-11-21 19:45:11,539 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1338842282] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:45:11,539 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1241842589] [2023-11-21 19:45:11,542 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2023-11-21 19:45:11,542 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:45:11,542 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-21 19:45:11,543 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-21 19:45:11,543 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-21 19:45:12,627 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 11 iterations. Over-approximation may be very coarse. [2023-11-21 19:45:12,682 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 91 for LOIs [2023-11-21 19:45:12,830 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 64 for LOIs [2023-11-21 19:45:12,881 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-21 19:45:16,359 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [1241842589] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:45:16,360 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-11-21 19:45:16,360 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [6, 6] total 25 [2023-11-21 19:45:16,360 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [634578688] [2023-11-21 19:45:16,360 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:45:16,360 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2023-11-21 19:45:16,361 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:45:16,361 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2023-11-21 19:45:16,361 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=530, Unknown=0, NotChecked=0, Total=600 [2023-11-21 19:45:16,361 INFO L87 Difference]: Start difference. First operand 58 states and 77 transitions. Second operand has 19 states, 15 states have (on average 1.0666666666666667) internal successors, (16), 14 states have internal predecessors, (16), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-21 19:45:17,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:45:17,265 INFO L93 Difference]: Finished difference Result 102 states and 140 transitions. [2023-11-21 19:45:17,266 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2023-11-21 19:45:17,266 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 15 states have (on average 1.0666666666666667) internal successors, (16), 14 states have internal predecessors, (16), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 27 [2023-11-21 19:45:17,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:45:17,269 INFO L225 Difference]: With dead ends: 102 [2023-11-21 19:45:17,269 INFO L226 Difference]: Without dead ends: 80 [2023-11-21 19:45:17,271 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 54 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 126 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=80, Invalid=622, Unknown=0, NotChecked=0, Total=702 [2023-11-21 19:45:17,273 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 6 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 297 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 302 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 297 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-11-21 19:45:17,273 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 78 Invalid, 302 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 297 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-11-21 19:45:17,274 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2023-11-21 19:45:17,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 76. [2023-11-21 19:45:17,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 51 states have (on average 1.2549019607843137) internal successors, (64), 54 states have internal predecessors, (64), 19 states have call successors, (19), 5 states have call predecessors, (19), 5 states have return successors, (18), 16 states have call predecessors, (18), 18 states have call successors, (18) [2023-11-21 19:45:17,311 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 101 transitions. [2023-11-21 19:45:17,317 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 101 transitions. Word has length 27 [2023-11-21 19:45:17,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:45:17,318 INFO L495 AbstractCegarLoop]: Abstraction has 76 states and 101 transitions. [2023-11-21 19:45:17,318 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 15 states have (on average 1.0666666666666667) internal successors, (16), 14 states have internal predecessors, (16), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-21 19:45:17,318 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 101 transitions. [2023-11-21 19:45:17,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2023-11-21 19:45:17,320 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:45:17,321 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 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, 1, 1, 1, 1] [2023-11-21 19:45:17,346 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-21 19:45:17,541 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-11-21 19:45:17,541 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:45:17,542 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:45:17,542 INFO L85 PathProgramCache]: Analyzing trace with hash -301475410, now seen corresponding path program 1 times [2023-11-21 19:45:17,542 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:45:17,542 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [880839760] [2023-11-21 19:45:17,543 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:17,543 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:45:17,565 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-21 19:45:17,566 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1032338942] [2023-11-21 19:45:17,566 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:17,566 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:45:17,566 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:45:17,572 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:45:17,580 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-21 19:45:17,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:17,632 INFO L262 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 9 conjunts are in the unsatisfiable core [2023-11-21 19:45:17,635 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:45:17,714 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-11-21 19:45:17,714 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:45:17,811 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-11-21 19:45:17,811 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:45:17,811 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [880839760] [2023-11-21 19:45:17,811 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-21 19:45:17,812 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1032338942] [2023-11-21 19:45:17,812 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1032338942] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:45:17,812 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1336805229] [2023-11-21 19:45:17,819 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2023-11-21 19:45:17,819 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:45:17,820 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-21 19:45:17,820 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-21 19:45:17,820 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-21 19:45:21,630 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 36 for LOIs [2023-11-21 19:45:21,646 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 64 for LOIs [2023-11-21 19:45:21,674 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-21 19:45:23,875 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [1336805229] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:45:23,876 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-11-21 19:45:23,876 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [6, 7] total 29 [2023-11-21 19:45:23,876 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [453727791] [2023-11-21 19:45:23,876 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:45:23,877 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2023-11-21 19:45:23,877 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:45:23,877 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2023-11-21 19:45:23,878 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=205, Invalid=607, Unknown=0, NotChecked=0, Total=812 [2023-11-21 19:45:23,878 INFO L87 Difference]: Start difference. First operand 76 states and 101 transitions. Second operand has 19 states, 16 states have (on average 1.3125) internal successors, (21), 14 states have internal predecessors, (21), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2023-11-21 19:45:24,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:45:24,492 INFO L93 Difference]: Finished difference Result 138 states and 185 transitions. [2023-11-21 19:45:24,492 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2023-11-21 19:45:24,493 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 16 states have (on average 1.3125) internal successors, (21), 14 states have internal predecessors, (21), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) Word has length 47 [2023-11-21 19:45:24,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:45:24,496 INFO L225 Difference]: With dead ends: 138 [2023-11-21 19:45:24,496 INFO L226 Difference]: Without dead ends: 101 [2023-11-21 19:45:24,497 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 108 SyntacticMatches, 4 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 460 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=216, Invalid=654, Unknown=0, NotChecked=0, Total=870 [2023-11-21 19:45:24,498 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 2 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 361 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 362 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 361 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-21 19:45:24,499 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 101 Invalid, 362 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 361 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-21 19:45:24,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2023-11-21 19:45:24,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 85. [2023-11-21 19:45:24,525 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 59 states have (on average 1.2542372881355932) internal successors, (74), 61 states have internal predecessors, (74), 19 states have call successors, (19), 6 states have call predecessors, (19), 6 states have return successors, (18), 17 states have call predecessors, (18), 18 states have call successors, (18) [2023-11-21 19:45:24,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 111 transitions. [2023-11-21 19:45:24,526 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 111 transitions. Word has length 47 [2023-11-21 19:45:24,527 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:45:24,527 INFO L495 AbstractCegarLoop]: Abstraction has 85 states and 111 transitions. [2023-11-21 19:45:24,527 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 16 states have (on average 1.3125) internal successors, (21), 14 states have internal predecessors, (21), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2023-11-21 19:45:24,527 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 111 transitions. [2023-11-21 19:45:24,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2023-11-21 19:45:24,529 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:45:24,529 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 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, 1, 1, 1] [2023-11-21 19:45:24,557 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-21 19:45:24,744 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:45:24,745 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:45:24,745 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:45:24,745 INFO L85 PathProgramCache]: Analyzing trace with hash -339484245, now seen corresponding path program 1 times [2023-11-21 19:45:24,745 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:45:24,745 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [667341403] [2023-11-21 19:45:24,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:24,745 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:45:24,758 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-21 19:45:24,777 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [934650903] [2023-11-21 19:45:24,778 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:24,778 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:45:24,778 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:45:24,779 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:45:24,802 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-21 19:45:24,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:24,846 INFO L262 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 11 conjunts are in the unsatisfiable core [2023-11-21 19:45:24,849 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:45:24,939 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 8 proven. 5 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-11-21 19:45:24,939 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:45:25,073 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 8 proven. 5 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-11-21 19:45:25,073 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:45:25,073 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [667341403] [2023-11-21 19:45:25,073 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-21 19:45:25,074 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [934650903] [2023-11-21 19:45:25,074 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [934650903] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:45:25,074 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1232787273] [2023-11-21 19:45:25,077 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2023-11-21 19:45:25,077 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:45:25,077 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-21 19:45:25,078 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-21 19:45:25,078 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-21 19:45:29,405 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2023-11-21 19:45:29,406 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2023-11-21 19:45:29,491 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 11 iterations. Over-approximation may be very coarse. [2023-11-21 19:45:29,492 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 11 iterations. Over-approximation may be very coarse. [2023-11-21 19:45:29,707 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 11 iterations. Over-approximation may be very coarse. [2023-11-21 19:45:29,707 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 11 iterations. Over-approximation may be very coarse. [2023-11-21 19:45:29,821 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 11 iterations. Over-approximation may be very coarse. [2023-11-21 19:45:29,822 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 11 iterations. Over-approximation may be very coarse. [2023-11-21 19:45:31,683 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 9 for LOIs [2023-11-21 19:45:31,688 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 64 for LOIs [2023-11-21 19:45:31,720 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-21 19:45:33,478 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2749#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (<= ~counter~0 11) (<= 3 ~counter~0))' at error location [2023-11-21 19:45:33,478 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-21 19:45:33,478 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-21 19:45:33,478 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 14 [2023-11-21 19:45:33,479 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [135061284] [2023-11-21 19:45:33,479 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-21 19:45:33,479 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-11-21 19:45:33,480 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:45:33,480 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-11-21 19:45:33,481 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=230, Invalid=1176, Unknown=0, NotChecked=0, Total=1406 [2023-11-21 19:45:33,482 INFO L87 Difference]: Start difference. First operand 85 states and 111 transitions. Second operand has 14 states, 14 states have (on average 3.357142857142857) internal successors, (47), 14 states have internal predecessors, (47), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2023-11-21 19:45:33,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:45:33,881 INFO L93 Difference]: Finished difference Result 423 states and 553 transitions. [2023-11-21 19:45:33,882 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2023-11-21 19:45:33,882 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.357142857142857) internal successors, (47), 14 states have internal predecessors, (47), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 48 [2023-11-21 19:45:33,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:45:33,887 INFO L225 Difference]: With dead ends: 423 [2023-11-21 19:45:33,887 INFO L226 Difference]: Without dead ends: 416 [2023-11-21 19:45:33,889 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 106 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 700 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=306, Invalid=1674, Unknown=0, NotChecked=0, Total=1980 [2023-11-21 19:45:33,890 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 171 mSDsluCounter, 201 mSDsCounter, 0 mSdLazyCounter, 135 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 171 SdHoareTripleChecker+Valid, 235 SdHoareTripleChecker+Invalid, 156 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 135 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-21 19:45:33,890 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [171 Valid, 235 Invalid, 156 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 135 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-21 19:45:33,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 416 states. [2023-11-21 19:45:33,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 416 to 324. [2023-11-21 19:45:33,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 324 states, 224 states have (on average 1.28125) internal successors, (287), 231 states have internal predecessors, (287), 75 states have call successors, (75), 24 states have call predecessors, (75), 24 states have return successors, (70), 68 states have call predecessors, (70), 70 states have call successors, (70) [2023-11-21 19:45:33,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 324 states to 324 states and 432 transitions. [2023-11-21 19:45:33,972 INFO L78 Accepts]: Start accepts. Automaton has 324 states and 432 transitions. Word has length 48 [2023-11-21 19:45:33,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:45:33,972 INFO L495 AbstractCegarLoop]: Abstraction has 324 states and 432 transitions. [2023-11-21 19:45:33,973 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.357142857142857) internal successors, (47), 14 states have internal predecessors, (47), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2023-11-21 19:45:33,973 INFO L276 IsEmpty]: Start isEmpty. Operand 324 states and 432 transitions. [2023-11-21 19:45:33,975 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2023-11-21 19:45:33,975 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:45:33,975 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 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, 1, 1] [2023-11-21 19:45:34,000 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-11-21 19:45:34,188 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2023-11-21 19:45:34,189 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:45:34,189 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:45:34,189 INFO L85 PathProgramCache]: Analyzing trace with hash -1953712133, now seen corresponding path program 1 times [2023-11-21 19:45:34,189 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:45:34,189 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [855162270] [2023-11-21 19:45:34,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:34,190 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:45:34,207 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-21 19:45:34,212 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [641304734] [2023-11-21 19:45:34,215 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:34,215 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:45:34,216 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:45:34,216 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:45:34,221 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-11-21 19:45:34,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:34,286 INFO L262 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 47 conjunts are in the unsatisfiable core [2023-11-21 19:45:34,289 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:45:35,117 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 8 proven. 7 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-11-21 19:45:35,117 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:45:35,782 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 8 proven. 6 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-11-21 19:45:35,782 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:45:35,782 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [855162270] [2023-11-21 19:45:35,783 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-21 19:45:35,783 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [641304734] [2023-11-21 19:45:35,783 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [641304734] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:45:35,783 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2120301214] [2023-11-21 19:45:35,786 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2023-11-21 19:45:35,786 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:45:35,787 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-21 19:45:35,787 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-21 19:45:35,787 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-21 19:45:39,283 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2023-11-21 19:45:39,283 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2023-11-21 19:45:39,329 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 11 iterations. Over-approximation may be very coarse. [2023-11-21 19:45:39,329 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 11 iterations. Over-approximation may be very coarse. [2023-11-21 19:45:39,484 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 11 iterations. Over-approximation may be very coarse. [2023-11-21 19:45:39,485 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 11 iterations. Over-approximation may be very coarse. [2023-11-21 19:45:39,559 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 11 iterations. Over-approximation may be very coarse. [2023-11-21 19:45:39,560 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 11 iterations. Over-approximation may be very coarse. [2023-11-21 19:45:40,991 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-11-21 19:45:40,994 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 64 for LOIs [2023-11-21 19:45:41,016 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-21 19:45:43,791 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4170#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-11-21 19:45:43,791 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-21 19:45:43,791 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-21 19:45:43,791 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 11] total 22 [2023-11-21 19:45:43,791 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1574735979] [2023-11-21 19:45:43,792 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-21 19:45:43,792 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2023-11-21 19:45:43,792 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:45:43,794 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2023-11-21 19:45:43,795 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=1768, Unknown=0, NotChecked=0, Total=1980 [2023-11-21 19:45:43,795 INFO L87 Difference]: Start difference. First operand 324 states and 432 transitions. Second operand has 22 states, 19 states have (on average 2.473684210526316) internal successors, (47), 19 states have internal predecessors, (47), 6 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2023-11-21 19:45:49,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:45:49,375 INFO L93 Difference]: Finished difference Result 744 states and 1088 transitions. [2023-11-21 19:45:49,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2023-11-21 19:45:49,376 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 19 states have (on average 2.473684210526316) internal successors, (47), 19 states have internal predecessors, (47), 6 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 49 [2023-11-21 19:45:49,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:45:49,396 INFO L225 Difference]: With dead ends: 744 [2023-11-21 19:45:49,396 INFO L226 Difference]: Without dead ends: 739 [2023-11-21 19:45:49,399 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 102 SyntacticMatches, 0 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1719 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=739, Invalid=5423, Unknown=0, NotChecked=0, Total=6162 [2023-11-21 19:45:49,400 INFO L413 NwaCegarLoop]: 58 mSDtfsCounter, 318 mSDsluCounter, 672 mSDsCounter, 0 mSdLazyCounter, 626 mSolverCounterSat, 172 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 326 SdHoareTripleChecker+Valid, 730 SdHoareTripleChecker+Invalid, 798 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 172 IncrementalHoareTripleChecker+Valid, 626 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2023-11-21 19:45:49,408 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [326 Valid, 730 Invalid, 798 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [172 Valid, 626 Invalid, 0 Unknown, 0 Unchecked, 2.0s Time] [2023-11-21 19:45:49,409 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 739 states. [2023-11-21 19:45:49,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 739 to 480. [2023-11-21 19:45:49,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 480 states, 338 states have (on average 1.3076923076923077) internal successors, (442), 344 states have internal predecessors, (442), 110 states have call successors, (110), 31 states have call predecessors, (110), 31 states have return successors, (106), 104 states have call predecessors, (106), 106 states have call successors, (106) [2023-11-21 19:45:49,652 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 480 states to 480 states and 658 transitions. [2023-11-21 19:45:49,652 INFO L78 Accepts]: Start accepts. Automaton has 480 states and 658 transitions. Word has length 49 [2023-11-21 19:45:49,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:45:49,653 INFO L495 AbstractCegarLoop]: Abstraction has 480 states and 658 transitions. [2023-11-21 19:45:49,653 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 19 states have (on average 2.473684210526316) internal successors, (47), 19 states have internal predecessors, (47), 6 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2023-11-21 19:45:49,653 INFO L276 IsEmpty]: Start isEmpty. Operand 480 states and 658 transitions. [2023-11-21 19:45:49,655 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2023-11-21 19:45:49,655 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:45:49,655 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:45:49,672 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-11-21 19:45:49,864 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-11-21 19:45:49,865 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:45:49,865 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:45:49,865 INFO L85 PathProgramCache]: Analyzing trace with hash -324758054, now seen corresponding path program 1 times [2023-11-21 19:45:49,865 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:45:49,866 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [801997052] [2023-11-21 19:45:49,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:49,866 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:45:49,876 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-21 19:45:49,877 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2084097738] [2023-11-21 19:45:49,877 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:49,877 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:45:49,877 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:45:49,878 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:45:49,882 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2add206e-df3b-49fa-bb49-776985d34b23/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-11-21 19:45:49,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:49,930 INFO L262 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 11 conjunts are in the unsatisfiable core [2023-11-21 19:45:49,933 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:45:49,980 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 10 proven. 10 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2023-11-21 19:45:49,980 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:45:50,044 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 10 proven. 10 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2023-11-21 19:45:50,044 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:45:50,044 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [801997052] [2023-11-21 19:45:50,044 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-21 19:45:50,045 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2084097738] [2023-11-21 19:45:50,045 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2084097738] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:45:50,045 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [292048149] [2023-11-21 19:45:50,048 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2023-11-21 19:45:50,048 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:45:50,048 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-21 19:45:50,049 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-21 19:45:50,049 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs