./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursified_nla-digbench/recursified_divbin2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 527bcce2 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bec4ba6f-630a-4394-bb13-e411895c6049/bin/uautomizer-verify-bycVGegfSx/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bec4ba6f-630a-4394-bb13-e411895c6049/bin/uautomizer-verify-bycVGegfSx/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bec4ba6f-630a-4394-bb13-e411895c6049/bin/uautomizer-verify-bycVGegfSx/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bec4ba6f-630a-4394-bb13-e411895c6049/bin/uautomizer-verify-bycVGegfSx/config/AutomizerReach.xml -i ../../sv-benchmarks/c/recursified_nla-digbench/recursified_divbin2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bec4ba6f-630a-4394-bb13-e411895c6049/bin/uautomizer-verify-bycVGegfSx/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bec4ba6f-630a-4394-bb13-e411895c6049/bin/uautomizer-verify-bycVGegfSx --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 07d2bb25a1c8c4ef92611e8b25e211f661495bf054d1380ec62ffea892b45c2f --- Real Ultimate output --- This is Ultimate 0.2.3-dev-527bcce [2023-11-21 22:15:02,622 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-21 22:15:02,737 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bec4ba6f-630a-4394-bb13-e411895c6049/bin/uautomizer-verify-bycVGegfSx/config/svcomp-Reach-32bit-Automizer_Default.epf [2023-11-21 22:15:02,742 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-21 22:15:02,743 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-21 22:15:02,785 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-21 22:15:02,786 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-21 22:15:02,787 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-21 22:15:02,788 INFO L151 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2023-11-21 22:15:02,793 INFO L153 SettingsManager]: * Use memory slicer=true [2023-11-21 22:15:02,794 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-21 22:15:02,795 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-21 22:15:02,796 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-21 22:15:02,798 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-21 22:15:02,798 INFO L153 SettingsManager]: * Use SBE=true [2023-11-21 22:15:02,799 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-21 22:15:02,800 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-21 22:15:02,800 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-21 22:15:02,801 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-21 22:15:02,801 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-21 22:15:02,801 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-21 22:15:02,802 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-21 22:15:02,803 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-21 22:15:02,803 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-21 22:15:02,804 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-21 22:15:02,804 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-21 22:15:02,804 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-21 22:15:02,805 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-21 22:15:02,806 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-11-21 22:15:02,806 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-21 22:15:02,808 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-21 22:15:02,808 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-21 22:15:02,809 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-21 22:15:02,809 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-21 22:15:02,809 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-21 22:15:02,809 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2023-11-21 22:15:02,810 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-21 22:15:02,810 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-21 22:15:02,810 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-11-21 22:15:02,811 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-21 22:15:02,811 INFO L153 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2023-11-21 22:15:02,811 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-21 22:15:02,811 INFO L153 SettingsManager]: * Looper check in Petri net analysis=SEMANTIC WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bec4ba6f-630a-4394-bb13-e411895c6049/bin/uautomizer-verify-bycVGegfSx/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bec4ba6f-630a-4394-bb13-e411895c6049/bin/uautomizer-verify-bycVGegfSx Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 07d2bb25a1c8c4ef92611e8b25e211f661495bf054d1380ec62ffea892b45c2f [2023-11-21 22:15:03,093 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-21 22:15:03,123 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-21 22:15:03,128 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-21 22:15:03,129 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-21 22:15:03,130 INFO L274 PluginConnector]: CDTParser initialized [2023-11-21 22:15:03,132 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bec4ba6f-630a-4394-bb13-e411895c6049/bin/uautomizer-verify-bycVGegfSx/../../sv-benchmarks/c/recursified_nla-digbench/recursified_divbin2.i [2023-11-21 22:15:06,337 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-21 22:15:06,574 INFO L384 CDTParser]: Found 1 translation units. [2023-11-21 22:15:06,575 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bec4ba6f-630a-4394-bb13-e411895c6049/sv-benchmarks/c/recursified_nla-digbench/recursified_divbin2.i [2023-11-21 22:15:06,584 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bec4ba6f-630a-4394-bb13-e411895c6049/bin/uautomizer-verify-bycVGegfSx/data/ede78c299/552cdeaddc2747e2a81628413e4e3f43/FLAGf5d0b0518 [2023-11-21 22:15:06,605 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bec4ba6f-630a-4394-bb13-e411895c6049/bin/uautomizer-verify-bycVGegfSx/data/ede78c299/552cdeaddc2747e2a81628413e4e3f43 [2023-11-21 22:15:06,608 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-21 22:15:06,609 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-21 22:15:06,611 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-21 22:15:06,611 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-21 22:15:06,617 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-21 22:15:06,618 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 10:15:06" (1/1) ... [2023-11-21 22:15:06,619 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5e09006e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 10:15:06, skipping insertion in model container [2023-11-21 22:15:06,619 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 10:15:06" (1/1) ... [2023-11-21 22:15:06,648 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-21 22:15:06,813 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_bec4ba6f-630a-4394-bb13-e411895c6049/sv-benchmarks/c/recursified_nla-digbench/recursified_divbin2.i[1567,1580] [2023-11-21 22:15:06,833 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-21 22:15:06,845 INFO L202 MainTranslator]: Completed pre-run [2023-11-21 22:15:06,859 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_bec4ba6f-630a-4394-bb13-e411895c6049/sv-benchmarks/c/recursified_nla-digbench/recursified_divbin2.i[1567,1580] [2023-11-21 22:15:06,870 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-21 22:15:06,885 INFO L206 MainTranslator]: Completed translation [2023-11-21 22:15:06,886 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 10:15:06 WrapperNode [2023-11-21 22:15:06,886 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-21 22:15:06,887 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-21 22:15:06,888 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-21 22:15:06,888 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-21 22:15:06,897 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 10:15:06" (1/1) ... [2023-11-21 22:15:06,906 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 10:15:06" (1/1) ... [2023-11-21 22:15:06,928 INFO L138 Inliner]: procedures = 19, calls = 59, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 57 [2023-11-21 22:15:06,928 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-21 22:15:06,929 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-21 22:15:06,929 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-21 22:15:06,929 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-21 22:15:06,941 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 10:15:06" (1/1) ... [2023-11-21 22:15:06,941 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 10:15:06" (1/1) ... [2023-11-21 22:15:06,950 INFO L184 PluginConnector]: Executing the observer HeapSplitter from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 10:15:06" (1/1) ... [2023-11-21 22:15:06,961 INFO L187 HeapSplitter]: Split 34 memory accesses to 6 slices as follows [2, 7, 11, 3, 7, 4] [2023-11-21 22:15:06,966 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 10:15:06" (1/1) ... [2023-11-21 22:15:06,966 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 10:15:06" (1/1) ... [2023-11-21 22:15:06,974 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 10:15:06" (1/1) ... [2023-11-21 22:15:06,977 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 10:15:06" (1/1) ... [2023-11-21 22:15:06,979 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 10:15:06" (1/1) ... [2023-11-21 22:15:06,980 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 10:15:06" (1/1) ... [2023-11-21 22:15:06,988 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-21 22:15:06,989 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-21 22:15:06,989 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-21 22:15:06,989 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-21 22:15:07,004 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 10:15:06" (1/1) ... [2023-11-21 22:15:07,011 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-21 22:15:07,023 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bec4ba6f-630a-4394-bb13-e411895c6049/bin/uautomizer-verify-bycVGegfSx/z3 [2023-11-21 22:15:07,035 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bec4ba6f-630a-4394-bb13-e411895c6049/bin/uautomizer-verify-bycVGegfSx/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-21 22:15:07,067 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bec4ba6f-630a-4394-bb13-e411895c6049/bin/uautomizer-verify-bycVGegfSx/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-21 22:15:07,082 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-21 22:15:07,082 INFO L130 BoogieDeclarations]: Found specification of procedure func_to_recursive_line_33_to_35_0 [2023-11-21 22:15:07,083 INFO L138 BoogieDeclarations]: Found implementation of procedure func_to_recursive_line_33_to_35_0 [2023-11-21 22:15:07,083 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#0 [2023-11-21 22:15:07,083 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#1 [2023-11-21 22:15:07,083 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#2 [2023-11-21 22:15:07,084 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#3 [2023-11-21 22:15:07,086 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#4 [2023-11-21 22:15:07,086 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#5 [2023-11-21 22:15:07,087 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-21 22:15:07,087 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#0 [2023-11-21 22:15:07,087 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#1 [2023-11-21 22:15:07,087 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#2 [2023-11-21 22:15:07,087 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#3 [2023-11-21 22:15:07,088 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#4 [2023-11-21 22:15:07,088 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#5 [2023-11-21 22:15:07,088 INFO L130 BoogieDeclarations]: Found specification of procedure func_to_recursive_line_37_to_44_0 [2023-11-21 22:15:07,088 INFO L138 BoogieDeclarations]: Found implementation of procedure func_to_recursive_line_37_to_44_0 [2023-11-21 22:15:07,088 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-21 22:15:07,089 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-21 22:15:07,090 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#0 [2023-11-21 22:15:07,090 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#1 [2023-11-21 22:15:07,090 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#2 [2023-11-21 22:15:07,091 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#3 [2023-11-21 22:15:07,091 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#4 [2023-11-21 22:15:07,092 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#5 [2023-11-21 22:15:07,092 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-11-21 22:15:07,092 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-11-21 22:15:07,092 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-21 22:15:07,241 INFO L240 CfgBuilder]: Building ICFG [2023-11-21 22:15:07,245 INFO L266 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-21 22:15:07,558 INFO L281 CfgBuilder]: Performing block encoding [2023-11-21 22:15:07,622 INFO L303 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-21 22:15:07,622 INFO L308 CfgBuilder]: Removed 2 assume(true) statements. [2023-11-21 22:15:07,624 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 10:15:07 BoogieIcfgContainer [2023-11-21 22:15:07,624 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-21 22:15:07,627 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-21 22:15:07,627 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-21 22:15:07,631 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-21 22:15:07,637 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 10:15:06" (1/3) ... [2023-11-21 22:15:07,638 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7acc005b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 10:15:07, skipping insertion in model container [2023-11-21 22:15:07,638 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 10:15:06" (2/3) ... [2023-11-21 22:15:07,638 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7acc005b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 10:15:07, skipping insertion in model container [2023-11-21 22:15:07,638 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 10:15:07" (3/3) ... [2023-11-21 22:15:07,640 INFO L112 eAbstractionObserver]: Analyzing ICFG recursified_divbin2.i [2023-11-21 22:15:07,663 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-21 22:15:07,663 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-21 22:15:07,708 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-21 22:15:07,714 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopHeads, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@1a012f43, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-21 22:15:07,715 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-21 22:15:07,720 INFO L276 IsEmpty]: Start isEmpty. Operand has 27 states, 16 states have (on average 1.375) internal successors, (22), 19 states have internal predecessors, (22), 6 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-11-21 22:15:07,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-11-21 22:15:07,731 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 22:15:07,731 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 22:15:07,732 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 22:15:07,736 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 22:15:07,737 INFO L85 PathProgramCache]: Analyzing trace with hash 2028572640, now seen corresponding path program 1 times [2023-11-21 22:15:07,745 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 22:15:07,745 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [596657635] [2023-11-21 22:15:07,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 22:15:07,746 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 22:15:07,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 22:15:07,955 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 22:15:07,956 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [596657635] [2023-11-21 22:15:07,956 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2023-11-21 22:15:07,957 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [754039624] [2023-11-21 22:15:07,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 22:15:07,957 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 22:15:07,958 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bec4ba6f-630a-4394-bb13-e411895c6049/bin/uautomizer-verify-bycVGegfSx/z3 [2023-11-21 22:15:07,960 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bec4ba6f-630a-4394-bb13-e411895c6049/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 22:15:07,977 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bec4ba6f-630a-4394-bb13-e411895c6049/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-21 22:15:08,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 22:15:08,113 INFO L262 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 1 conjunts are in the unsatisfiable core [2023-11-21 22:15:08,119 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 22:15:08,143 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 22:15:08,143 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-21 22:15:08,144 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [754039624] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 22:15:08,144 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 22:15:08,144 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-21 22:15:08,147 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1340253166] [2023-11-21 22:15:08,148 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 22:15:08,152 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-11-21 22:15:08,153 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 22:15:08,183 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-11-21 22:15:08,184 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-11-21 22:15:08,186 INFO L87 Difference]: Start difference. First operand has 27 states, 16 states have (on average 1.375) internal successors, (22), 19 states have internal predecessors, (22), 6 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Second operand has 2 states, 2 states have (on average 4.5) internal successors, (9), 2 states have internal predecessors, (9), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-21 22:15:08,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 22:15:08,226 INFO L93 Difference]: Finished difference Result 48 states and 64 transitions. [2023-11-21 22:15:08,228 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-11-21 22:15:08,229 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 4.5) internal successors, (9), 2 states have internal predecessors, (9), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2023-11-21 22:15:08,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 22:15:08,237 INFO L225 Difference]: With dead ends: 48 [2023-11-21 22:15:08,237 INFO L226 Difference]: Without dead ends: 25 [2023-11-21 22:15:08,241 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 22:15:08,245 INFO L413 NwaCegarLoop]: 28 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, 28 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 22:15:08,246 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 28 Invalid, 3 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-21 22:15:08,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2023-11-21 22:15:08,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2023-11-21 22:15:08,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 15 states have (on average 1.2) internal successors, (18), 18 states have internal predecessors, (18), 6 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2023-11-21 22:15:08,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2023-11-21 22:15:08,285 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 13 [2023-11-21 22:15:08,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 22:15:08,285 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2023-11-21 22:15:08,286 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 4.5) internal successors, (9), 2 states have internal predecessors, (9), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-21 22:15:08,286 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2023-11-21 22:15:08,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-11-21 22:15:08,287 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 22:15:08,288 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 22:15:08,309 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bec4ba6f-630a-4394-bb13-e411895c6049/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-11-21 22:15:08,509 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bec4ba6f-630a-4394-bb13-e411895c6049/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2023-11-21 22:15:08,510 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 22:15:08,510 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 22:15:08,511 INFO L85 PathProgramCache]: Analyzing trace with hash 1765858941, now seen corresponding path program 1 times [2023-11-21 22:15:08,511 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 22:15:08,511 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [271784259] [2023-11-21 22:15:08,511 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 22:15:08,511 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 22:15:08,565 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-21 22:15:08,566 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1923684132] [2023-11-21 22:15:08,566 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 22:15:08,566 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 22:15:08,567 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bec4ba6f-630a-4394-bb13-e411895c6049/bin/uautomizer-verify-bycVGegfSx/z3 [2023-11-21 22:15:08,572 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bec4ba6f-630a-4394-bb13-e411895c6049/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 22:15:08,577 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bec4ba6f-630a-4394-bb13-e411895c6049/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-21 22:15:08,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 22:15:08,827 INFO L262 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 59 conjunts are in the unsatisfiable core [2023-11-21 22:15:08,834 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 22:15:08,923 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-21 22:15:08,934 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2023-11-21 22:15:08,950 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2023-11-21 22:15:09,192 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2023-11-21 22:15:09,200 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2023-11-21 22:15:09,277 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 22:15:09,277 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-21 22:15:09,278 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 22:15:09,278 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [271784259] [2023-11-21 22:15:09,279 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-21 22:15:09,279 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1923684132] [2023-11-21 22:15:09,280 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1923684132] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 22:15:09,281 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 22:15:09,281 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2023-11-21 22:15:09,281 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1796226974] [2023-11-21 22:15:09,282 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 22:15:09,282 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-21 22:15:09,283 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 22:15:09,284 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-21 22:15:09,287 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2023-11-21 22:15:09,288 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand has 9 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-21 22:15:09,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 22:15:09,719 INFO L93 Difference]: Finished difference Result 42 states and 47 transitions. [2023-11-21 22:15:09,720 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-21 22:15:09,720 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2023-11-21 22:15:09,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 22:15:09,724 INFO L225 Difference]: With dead ends: 42 [2023-11-21 22:15:09,725 INFO L226 Difference]: Without dead ends: 40 [2023-11-21 22:15:09,726 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=43, Invalid=139, Unknown=0, NotChecked=0, Total=182 [2023-11-21 22:15:09,728 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 34 mSDsluCounter, 63 mSDsCounter, 0 mSdLazyCounter, 130 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 77 SdHoareTripleChecker+Invalid, 143 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 130 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-21 22:15:09,738 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [35 Valid, 77 Invalid, 143 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 130 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-21 22:15:09,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2023-11-21 22:15:09,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 38. [2023-11-21 22:15:09,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 24 states have (on average 1.1666666666666667) internal successors, (28), 27 states have internal predecessors, (28), 7 states have call successors, (7), 5 states have call predecessors, (7), 6 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) [2023-11-21 22:15:09,755 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 43 transitions. [2023-11-21 22:15:09,755 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 43 transitions. Word has length 14 [2023-11-21 22:15:09,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 22:15:09,756 INFO L495 AbstractCegarLoop]: Abstraction has 38 states and 43 transitions. [2023-11-21 22:15:09,756 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-21 22:15:09,756 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 43 transitions. [2023-11-21 22:15:09,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-11-21 22:15:09,759 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 22:15:09,759 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 22:15:09,766 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bec4ba6f-630a-4394-bb13-e411895c6049/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-11-21 22:15:09,965 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bec4ba6f-630a-4394-bb13-e411895c6049/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 22:15:09,965 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 22:15:09,966 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 22:15:09,966 INFO L85 PathProgramCache]: Analyzing trace with hash 1561413024, now seen corresponding path program 1 times [2023-11-21 22:15:09,966 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 22:15:09,966 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [660300217] [2023-11-21 22:15:09,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 22:15:09,967 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 22:15:10,008 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-21 22:15:10,009 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1838939231] [2023-11-21 22:15:10,009 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 22:15:10,009 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 22:15:10,009 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bec4ba6f-630a-4394-bb13-e411895c6049/bin/uautomizer-verify-bycVGegfSx/z3 [2023-11-21 22:15:10,010 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bec4ba6f-630a-4394-bb13-e411895c6049/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 22:15:10,031 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bec4ba6f-630a-4394-bb13-e411895c6049/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-21 22:15:10,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 22:15:10,167 INFO L262 TraceCheckSpWp]: Trace formula consists of 281 conjuncts, 54 conjunts are in the unsatisfiable core [2023-11-21 22:15:10,171 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 22:15:10,182 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2023-11-21 22:15:10,192 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-21 22:15:10,532 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2023-11-21 22:15:10,555 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 22:15:10,555 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-21 22:15:10,555 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 22:15:10,555 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [660300217] [2023-11-21 22:15:10,555 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-21 22:15:10,555 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1838939231] [2023-11-21 22:15:10,556 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1838939231] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 22:15:10,556 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 22:15:10,556 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2023-11-21 22:15:10,556 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1993596746] [2023-11-21 22:15:10,556 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 22:15:10,557 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-11-21 22:15:10,557 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 22:15:10,557 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-11-21 22:15:10,558 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2023-11-21 22:15:10,558 INFO L87 Difference]: Start difference. First operand 38 states and 43 transitions. Second operand has 11 states, 10 states have (on average 1.7) internal successors, (17), 8 states have internal predecessors, (17), 3 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-21 22:15:11,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 22:15:11,138 INFO L93 Difference]: Finished difference Result 83 states and 91 transitions. [2023-11-21 22:15:11,139 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-11-21 22:15:11,139 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 1.7) internal successors, (17), 8 states have internal predecessors, (17), 3 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 24 [2023-11-21 22:15:11,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 22:15:11,145 INFO L225 Difference]: With dead ends: 83 [2023-11-21 22:15:11,145 INFO L226 Difference]: Without dead ends: 63 [2023-11-21 22:15:11,147 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=90, Invalid=290, Unknown=0, NotChecked=0, Total=380 [2023-11-21 22:15:11,153 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 47 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 165 mSolverCounterSat, 15 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 181 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 165 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-21 22:15:11,154 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [48 Valid, 38 Invalid, 181 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 165 Invalid, 1 Unknown, 0 Unchecked, 0.2s Time] [2023-11-21 22:15:11,156 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2023-11-21 22:15:11,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 61. [2023-11-21 22:15:11,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 40 states have (on average 1.125) internal successors, (45), 42 states have internal predecessors, (45), 10 states have call successors, (10), 9 states have call predecessors, (10), 10 states have return successors, (12), 9 states have call predecessors, (12), 8 states have call successors, (12) [2023-11-21 22:15:11,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 67 transitions. [2023-11-21 22:15:11,183 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 67 transitions. Word has length 24 [2023-11-21 22:15:11,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 22:15:11,183 INFO L495 AbstractCegarLoop]: Abstraction has 61 states and 67 transitions. [2023-11-21 22:15:11,184 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 1.7) internal successors, (17), 8 states have internal predecessors, (17), 3 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-21 22:15:11,184 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 67 transitions. [2023-11-21 22:15:11,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-11-21 22:15:11,185 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 22:15:11,186 INFO L195 NwaCegarLoop]: trace histogram [2, 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 22:15:11,215 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bec4ba6f-630a-4394-bb13-e411895c6049/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-21 22:15:11,399 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bec4ba6f-630a-4394-bb13-e411895c6049/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 22:15:11,400 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 22:15:11,400 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 22:15:11,400 INFO L85 PathProgramCache]: Analyzing trace with hash 1894831411, now seen corresponding path program 1 times [2023-11-21 22:15:11,400 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 22:15:11,401 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [320854734] [2023-11-21 22:15:11,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 22:15:11,401 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 22:15:11,434 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-21 22:15:11,434 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1334211670] [2023-11-21 22:15:11,435 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 22:15:11,435 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 22:15:11,435 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bec4ba6f-630a-4394-bb13-e411895c6049/bin/uautomizer-verify-bycVGegfSx/z3 [2023-11-21 22:15:11,436 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bec4ba6f-630a-4394-bb13-e411895c6049/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 22:15:11,471 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bec4ba6f-630a-4394-bb13-e411895c6049/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-21 22:15:11,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 22:15:11,970 WARN L260 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 125 conjunts are in the unsatisfiable core [2023-11-21 22:15:11,977 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 22:15:11,988 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2023-11-21 22:15:11,990 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-21 22:15:11,995 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-21 22:15:12,001 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-21 22:15:12,008 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2023-11-21 22:15:13,036 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2023-11-21 22:15:13,042 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 12 [2023-11-21 22:15:13,124 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 22:15:13,124 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 22:15:14,352 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 22:15:14,353 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 22:15:14,353 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [320854734] [2023-11-21 22:15:14,353 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-21 22:15:14,354 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1334211670] [2023-11-21 22:15:14,354 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1334211670] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 22:15:14,354 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-21 22:15:14,354 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 11] total 25 [2023-11-21 22:15:14,354 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1646148179] [2023-11-21 22:15:14,354 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-21 22:15:14,355 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-11-21 22:15:14,355 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 22:15:14,357 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-11-21 22:15:14,357 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=522, Unknown=0, NotChecked=0, Total=600 [2023-11-21 22:15:14,357 INFO L87 Difference]: Start difference. First operand 61 states and 67 transitions. Second operand has 25 states, 19 states have (on average 1.631578947368421) internal successors, (31), 19 states have internal predecessors, (31), 7 states have call successors, (8), 3 states have call predecessors, (8), 6 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) [2023-11-21 22:15:16,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 22:15:16,007 INFO L93 Difference]: Finished difference Result 71 states and 77 transitions. [2023-11-21 22:15:16,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2023-11-21 22:15:16,014 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 19 states have (on average 1.631578947368421) internal successors, (31), 19 states have internal predecessors, (31), 7 states have call successors, (8), 3 states have call predecessors, (8), 6 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) Word has length 24 [2023-11-21 22:15:16,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 22:15:16,015 INFO L225 Difference]: With dead ends: 71 [2023-11-21 22:15:16,015 INFO L226 Difference]: Without dead ends: 43 [2023-11-21 22:15:16,016 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 22 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 258 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=161, Invalid=1099, Unknown=0, NotChecked=0, Total=1260 [2023-11-21 22:15:16,017 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 42 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 354 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 87 SdHoareTripleChecker+Invalid, 374 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 354 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2023-11-21 22:15:16,017 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [42 Valid, 87 Invalid, 374 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 354 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2023-11-21 22:15:16,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2023-11-21 22:15:16,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2023-11-21 22:15:16,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 28 states have (on average 1.1071428571428572) internal successors, (31), 29 states have internal predecessors, (31), 7 states have call successors, (7), 6 states have call predecessors, (7), 7 states have return successors, (9), 7 states have call predecessors, (9), 6 states have call successors, (9) [2023-11-21 22:15:16,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 47 transitions. [2023-11-21 22:15:16,028 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 47 transitions. Word has length 24 [2023-11-21 22:15:16,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 22:15:16,029 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 47 transitions. [2023-11-21 22:15:16,029 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 19 states have (on average 1.631578947368421) internal successors, (31), 19 states have internal predecessors, (31), 7 states have call successors, (8), 3 states have call predecessors, (8), 6 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) [2023-11-21 22:15:16,029 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 47 transitions. [2023-11-21 22:15:16,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2023-11-21 22:15:16,032 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 22:15:16,032 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 22:15:16,044 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bec4ba6f-630a-4394-bb13-e411895c6049/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-21 22:15:16,239 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bec4ba6f-630a-4394-bb13-e411895c6049/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 22:15:16,240 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 22:15:16,240 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 22:15:16,240 INFO L85 PathProgramCache]: Analyzing trace with hash 1952346023, now seen corresponding path program 1 times [2023-11-21 22:15:16,241 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 22:15:16,241 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1324358329] [2023-11-21 22:15:16,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 22:15:16,241 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 22:15:16,326 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-21 22:15:16,326 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [31197458] [2023-11-21 22:15:16,326 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 22:15:16,327 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 22:15:16,327 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bec4ba6f-630a-4394-bb13-e411895c6049/bin/uautomizer-verify-bycVGegfSx/z3 [2023-11-21 22:15:16,329 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bec4ba6f-630a-4394-bb13-e411895c6049/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 22:15:16,351 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bec4ba6f-630a-4394-bb13-e411895c6049/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-21 22:15:16,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 22:15:16,554 WARN L260 TraceCheckSpWp]: Trace formula consists of 320 conjuncts, 196 conjunts are in the unsatisfiable core [2023-11-21 22:15:16,564 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 22:15:16,577 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2023-11-21 22:15:16,583 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2023-11-21 22:15:16,593 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-21 22:15:16,604 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2023-11-21 22:15:16,612 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-21 22:15:17,241 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2023-11-21 22:15:17,777 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 81 treesize of output 89 [2023-11-21 22:15:17,790 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 11 [2023-11-21 22:15:17,870 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 5 [2023-11-21 22:15:17,876 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2023-11-21 22:15:17,909 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 26 [2023-11-21 22:15:17,935 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2023-11-21 22:15:18,080 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 20 [2023-11-21 22:15:18,087 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 9 [2023-11-21 22:15:18,212 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-21 22:15:18,212 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 22:15:18,644 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 27 [2023-11-21 22:15:19,018 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 22:15:19,018 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1324358329] [2023-11-21 22:15:19,018 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-21 22:15:19,018 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [31197458] [2023-11-21 22:15:19,018 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [31197458] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 22:15:19,018 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-11-21 22:15:19,019 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2023-11-21 22:15:19,019 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2116967211] [2023-11-21 22:15:19,019 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-11-21 22:15:19,019 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-11-21 22:15:19,020 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 22:15:19,020 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-11-21 22:15:19,021 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=489, Unknown=0, NotChecked=0, Total=552 [2023-11-21 22:15:19,021 INFO L87 Difference]: Start difference. First operand 43 states and 47 transitions. Second operand has 20 states, 16 states have (on average 1.25) internal successors, (20), 14 states have internal predecessors, (20), 6 states have call successors, (6), 5 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-21 22:15:20,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 22:15:20,516 INFO L93 Difference]: Finished difference Result 71 states and 79 transitions. [2023-11-21 22:15:20,517 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2023-11-21 22:15:20,517 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 16 states have (on average 1.25) internal successors, (20), 14 states have internal predecessors, (20), 6 states have call successors, (6), 5 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 30 [2023-11-21 22:15:20,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 22:15:20,518 INFO L225 Difference]: With dead ends: 71 [2023-11-21 22:15:20,519 INFO L226 Difference]: Without dead ends: 65 [2023-11-21 22:15:20,520 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 14 SyntacticMatches, 3 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 177 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=129, Invalid=993, Unknown=0, NotChecked=0, Total=1122 [2023-11-21 22:15:20,520 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 41 mSDsluCounter, 93 mSDsCounter, 0 mSdLazyCounter, 423 mSolverCounterSat, 14 mSolverCounterUnsat, 5 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 107 SdHoareTripleChecker+Invalid, 442 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 423 IncrementalHoareTripleChecker+Invalid, 5 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-11-21 22:15:20,521 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [42 Valid, 107 Invalid, 442 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 423 Invalid, 5 Unknown, 0 Unchecked, 0.7s Time] [2023-11-21 22:15:20,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2023-11-21 22:15:20,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 56. [2023-11-21 22:15:20,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 36 states have (on average 1.0833333333333333) internal successors, (39), 37 states have internal predecessors, (39), 10 states have call successors, (10), 8 states have call predecessors, (10), 9 states have return successors, (15), 10 states have call predecessors, (15), 9 states have call successors, (15) [2023-11-21 22:15:20,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 64 transitions. [2023-11-21 22:15:20,537 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 64 transitions. Word has length 30 [2023-11-21 22:15:20,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 22:15:20,538 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 64 transitions. [2023-11-21 22:15:20,538 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 16 states have (on average 1.25) internal successors, (20), 14 states have internal predecessors, (20), 6 states have call successors, (6), 5 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-21 22:15:20,538 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 64 transitions. [2023-11-21 22:15:20,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2023-11-21 22:15:20,539 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 22:15:20,539 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 22:15:20,551 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bec4ba6f-630a-4394-bb13-e411895c6049/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-21 22:15:20,746 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bec4ba6f-630a-4394-bb13-e411895c6049/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 22:15:20,747 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 22:15:20,747 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 22:15:20,747 INFO L85 PathProgramCache]: Analyzing trace with hash -1478572818, now seen corresponding path program 2 times [2023-11-21 22:15:20,748 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 22:15:20,748 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [291805836] [2023-11-21 22:15:20,748 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 22:15:20,748 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 22:15:20,821 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-21 22:15:20,823 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1201054455] [2023-11-21 22:15:20,823 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2023-11-21 22:15:20,823 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 22:15:20,824 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bec4ba6f-630a-4394-bb13-e411895c6049/bin/uautomizer-verify-bycVGegfSx/z3 [2023-11-21 22:15:20,832 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bec4ba6f-630a-4394-bb13-e411895c6049/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 22:15:20,847 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bec4ba6f-630a-4394-bb13-e411895c6049/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-21 22:15:21,285 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2023-11-21 22:15:21,285 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-21 22:15:21,290 WARN L260 TraceCheckSpWp]: Trace formula consists of 359 conjuncts, 199 conjunts are in the unsatisfiable core [2023-11-21 22:15:21,306 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 22:15:21,313 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2023-11-21 22:15:21,316 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-21 22:15:21,320 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2023-11-21 22:15:21,326 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-21 22:15:21,860 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2023-11-21 22:15:22,236 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 95 treesize of output 103 [2023-11-21 22:15:22,248 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 11 [2023-11-21 22:15:22,343 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 5 [2023-11-21 22:15:22,347 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2023-11-21 22:15:22,390 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 59 treesize of output 37 [2023-11-21 22:15:22,418 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2023-11-21 22:15:22,561 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 20 [2023-11-21 22:15:22,572 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 9 [2023-11-21 22:15:22,686 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-21 22:15:22,686 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 22:15:23,092 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 27 [2023-11-21 22:15:23,724 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 22:15:23,725 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [291805836] [2023-11-21 22:15:23,725 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-21 22:15:23,725 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1201054455] [2023-11-21 22:15:23,725 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1201054455] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 22:15:23,725 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-11-21 22:15:23,725 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2023-11-21 22:15:23,725 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1183695269] [2023-11-21 22:15:23,726 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-11-21 22:15:23,726 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-11-21 22:15:23,726 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 22:15:23,727 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-11-21 22:15:23,727 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=492, Unknown=0, NotChecked=0, Total=552 [2023-11-21 22:15:23,728 INFO L87 Difference]: Start difference. First operand 56 states and 64 transitions. Second operand has 20 states, 15 states have (on average 1.6) internal successors, (24), 15 states have internal predecessors, (24), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-11-21 22:15:25,384 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 22:15:25,385 INFO L93 Difference]: Finished difference Result 84 states and 96 transitions. [2023-11-21 22:15:25,386 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2023-11-21 22:15:25,386 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 15 states have (on average 1.6) internal successors, (24), 15 states have internal predecessors, (24), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 36 [2023-11-21 22:15:25,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 22:15:25,389 INFO L225 Difference]: With dead ends: 84 [2023-11-21 22:15:25,389 INFO L226 Difference]: Without dead ends: 78 [2023-11-21 22:15:25,390 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 20 SyntacticMatches, 3 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 155 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=127, Invalid=995, Unknown=0, NotChecked=0, Total=1122 [2023-11-21 22:15:25,391 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 34 mSDsluCounter, 157 mSDsCounter, 0 mSdLazyCounter, 688 mSolverCounterSat, 11 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 176 SdHoareTripleChecker+Invalid, 702 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 688 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2023-11-21 22:15:25,391 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [35 Valid, 176 Invalid, 702 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 688 Invalid, 3 Unknown, 0 Unchecked, 1.0s Time] [2023-11-21 22:15:25,392 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2023-11-21 22:15:25,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 58. [2023-11-21 22:15:25,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 37 states have (on average 1.0810810810810811) internal successors, (40), 38 states have internal predecessors, (40), 10 states have call successors, (10), 8 states have call predecessors, (10), 10 states have return successors, (17), 11 states have call predecessors, (17), 9 states have call successors, (17) [2023-11-21 22:15:25,409 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 67 transitions. [2023-11-21 22:15:25,409 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 67 transitions. Word has length 36 [2023-11-21 22:15:25,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 22:15:25,410 INFO L495 AbstractCegarLoop]: Abstraction has 58 states and 67 transitions. [2023-11-21 22:15:25,410 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 15 states have (on average 1.6) internal successors, (24), 15 states have internal predecessors, (24), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-11-21 22:15:25,410 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 67 transitions. [2023-11-21 22:15:25,412 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2023-11-21 22:15:25,412 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 22:15:25,412 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 22:15:25,418 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bec4ba6f-630a-4394-bb13-e411895c6049/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-21 22:15:25,615 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bec4ba6f-630a-4394-bb13-e411895c6049/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 22:15:25,616 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 22:15:25,616 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 22:15:25,616 INFO L85 PathProgramCache]: Analyzing trace with hash -347884171, now seen corresponding path program 3 times [2023-11-21 22:15:25,617 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 22:15:25,617 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [618446121] [2023-11-21 22:15:25,617 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 22:15:25,617 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 22:15:25,649 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-21 22:15:25,650 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1621978792] [2023-11-21 22:15:25,650 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-21 22:15:25,650 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 22:15:25,650 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bec4ba6f-630a-4394-bb13-e411895c6049/bin/uautomizer-verify-bycVGegfSx/z3 [2023-11-21 22:15:25,651 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bec4ba6f-630a-4394-bb13-e411895c6049/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 22:15:25,671 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bec4ba6f-630a-4394-bb13-e411895c6049/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-21 22:15:27,157 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-11-21 22:15:27,157 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-21 22:15:27,169 WARN L260 TraceCheckSpWp]: Trace formula consists of 398 conjuncts, 256 conjunts are in the unsatisfiable core [2023-11-21 22:15:27,177 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 22:15:27,189 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-21 22:15:27,199 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2023-11-21 22:15:27,207 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-21 22:15:27,215 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2023-11-21 22:15:27,958 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2023-11-21 22:15:28,749 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 95 treesize of output 103 [2023-11-21 22:15:28,766 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 11 [2023-11-21 22:15:28,816 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 59 treesize of output 37 [2023-11-21 22:15:28,881 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-11-21 22:15:28,928 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2023-11-21 22:15:29,141 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 18 [2023-11-21 22:15:29,147 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 9 [2023-11-21 22:15:29,265 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 20 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-11-21 22:15:29,265 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 22:15:29,692 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 27 [2023-11-21 22:15:30,514 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 22:15:30,514 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [618446121] [2023-11-21 22:15:30,514 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-21 22:15:30,514 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1621978792] [2023-11-21 22:15:30,514 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1621978792] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 22:15:30,515 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-11-21 22:15:30,515 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2023-11-21 22:15:30,515 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [661838157] [2023-11-21 22:15:30,515 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-11-21 22:15:30,515 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2023-11-21 22:15:30,516 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 22:15:30,516 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2023-11-21 22:15:30,517 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=680, Unknown=0, NotChecked=0, Total=756 [2023-11-21 22:15:30,517 INFO L87 Difference]: Start difference. First operand 58 states and 67 transitions. Second operand has 23 states, 17 states have (on average 1.411764705882353) internal successors, (24), 17 states have internal predecessors, (24), 7 states have call successors, (7), 5 states have call predecessors, (7), 5 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) [2023-11-21 22:15:32,500 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 22:15:32,500 INFO L93 Difference]: Finished difference Result 86 states and 99 transitions. [2023-11-21 22:15:32,500 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2023-11-21 22:15:32,501 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 17 states have (on average 1.411764705882353) internal successors, (24), 17 states have internal predecessors, (24), 7 states have call successors, (7), 5 states have call predecessors, (7), 5 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) Word has length 42 [2023-11-21 22:15:32,501 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 22:15:32,502 INFO L225 Difference]: With dead ends: 86 [2023-11-21 22:15:32,502 INFO L226 Difference]: Without dead ends: 80 [2023-11-21 22:15:32,504 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 22 SyntacticMatches, 3 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 251 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=161, Invalid=1321, Unknown=0, NotChecked=0, Total=1482 [2023-11-21 22:15:32,504 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 36 mSDsluCounter, 171 mSDsCounter, 0 mSdLazyCounter, 706 mSolverCounterSat, 12 mSolverCounterUnsat, 4 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 191 SdHoareTripleChecker+Invalid, 722 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 706 IncrementalHoareTripleChecker+Invalid, 4 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2023-11-21 22:15:32,505 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [37 Valid, 191 Invalid, 722 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 706 Invalid, 4 Unknown, 0 Unchecked, 1.0s Time] [2023-11-21 22:15:32,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2023-11-21 22:15:32,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 60. [2023-11-21 22:15:32,522 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 38 states have (on average 1.0789473684210527) internal successors, (41), 39 states have internal predecessors, (41), 10 states have call successors, (10), 8 states have call predecessors, (10), 11 states have return successors, (19), 12 states have call predecessors, (19), 9 states have call successors, (19) [2023-11-21 22:15:32,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 70 transitions. [2023-11-21 22:15:32,523 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 70 transitions. Word has length 42 [2023-11-21 22:15:32,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 22:15:32,524 INFO L495 AbstractCegarLoop]: Abstraction has 60 states and 70 transitions. [2023-11-21 22:15:32,524 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 17 states have (on average 1.411764705882353) internal successors, (24), 17 states have internal predecessors, (24), 7 states have call successors, (7), 5 states have call predecessors, (7), 5 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) [2023-11-21 22:15:32,524 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 70 transitions. [2023-11-21 22:15:32,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2023-11-21 22:15:32,526 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 22:15:32,526 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 22:15:32,534 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bec4ba6f-630a-4394-bb13-e411895c6049/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2023-11-21 22:15:32,734 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bec4ba6f-630a-4394-bb13-e411895c6049/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 22:15:32,734 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 22:15:32,735 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 22:15:32,735 INFO L85 PathProgramCache]: Analyzing trace with hash 1127395644, now seen corresponding path program 4 times [2023-11-21 22:15:32,735 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 22:15:32,735 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1702006139] [2023-11-21 22:15:32,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 22:15:32,735 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 22:15:32,765 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-21 22:15:32,766 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2092307772] [2023-11-21 22:15:32,766 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-21 22:15:32,766 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 22:15:32,766 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bec4ba6f-630a-4394-bb13-e411895c6049/bin/uautomizer-verify-bycVGegfSx/z3 [2023-11-21 22:15:32,768 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bec4ba6f-630a-4394-bb13-e411895c6049/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 22:15:32,770 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bec4ba6f-630a-4394-bb13-e411895c6049/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-21 22:15:33,059 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-21 22:15:33,060 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-21 22:15:33,065 WARN L260 TraceCheckSpWp]: Trace formula consists of 437 conjuncts, 265 conjunts are in the unsatisfiable core [2023-11-21 22:15:33,082 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 22:15:33,093 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-21 22:15:33,102 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2023-11-21 22:15:33,109 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-21 22:15:33,116 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2023-11-21 22:15:34,193 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2023-11-21 22:15:34,740 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2023-11-21 22:15:34,748 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 27 [2023-11-21 22:15:34,762 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2023-11-21 22:15:34,985 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2023-11-21 22:15:34,989 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 19 [2023-11-21 22:15:35,122 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 6 proven. 29 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-11-21 22:15:35,122 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 22:15:53,076 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 22:15:53,076 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1702006139] [2023-11-21 22:15:53,076 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-21 22:15:53,076 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2092307772] [2023-11-21 22:15:53,077 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2092307772] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 22:15:53,077 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-11-21 22:15:53,077 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2023-11-21 22:15:53,077 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1785883849] [2023-11-21 22:15:53,077 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-11-21 22:15:53,078 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2023-11-21 22:15:53,078 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 22:15:53,079 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2023-11-21 22:15:53,079 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=903, Unknown=5, NotChecked=0, Total=992 [2023-11-21 22:15:53,080 INFO L87 Difference]: Start difference. First operand 60 states and 70 transitions. Second operand has 23 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 17 states have internal predecessors, (25), 7 states have call successors, (7), 5 states have call predecessors, (7), 6 states have return successors, (6), 6 states have call predecessors, (6), 4 states have call successors, (6) [2023-11-21 22:15:58,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 22:15:58,234 INFO L93 Difference]: Finished difference Result 88 states and 102 transitions. [2023-11-21 22:15:58,236 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2023-11-21 22:15:58,236 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 17 states have internal predecessors, (25), 7 states have call successors, (7), 5 states have call predecessors, (7), 6 states have return successors, (6), 6 states have call predecessors, (6), 4 states have call successors, (6) Word has length 48 [2023-11-21 22:15:58,237 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 22:15:58,238 INFO L225 Difference]: With dead ends: 88 [2023-11-21 22:15:58,238 INFO L226 Difference]: Without dead ends: 82 [2023-11-21 22:15:58,239 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 35 SyntacticMatches, 3 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 270 ImplicationChecksByTransitivity, 18.9s TimeCoverageRelationStatistics Valid=157, Invalid=1559, Unknown=6, NotChecked=0, Total=1722 [2023-11-21 22:15:58,240 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 34 mSDsluCounter, 192 mSDsCounter, 0 mSdLazyCounter, 841 mSolverCounterSat, 11 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 213 SdHoareTripleChecker+Invalid, 855 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 841 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2023-11-21 22:15:58,241 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [35 Valid, 213 Invalid, 855 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 841 Invalid, 3 Unknown, 0 Unchecked, 1.3s Time] [2023-11-21 22:15:58,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2023-11-21 22:15:58,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 62. [2023-11-21 22:15:58,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 39 states have (on average 1.0769230769230769) internal successors, (42), 40 states have internal predecessors, (42), 10 states have call successors, (10), 8 states have call predecessors, (10), 12 states have return successors, (21), 13 states have call predecessors, (21), 9 states have call successors, (21) [2023-11-21 22:15:58,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 73 transitions. [2023-11-21 22:15:58,270 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 73 transitions. Word has length 48 [2023-11-21 22:15:58,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 22:15:58,271 INFO L495 AbstractCegarLoop]: Abstraction has 62 states and 73 transitions. [2023-11-21 22:15:58,271 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 17 states have internal predecessors, (25), 7 states have call successors, (7), 5 states have call predecessors, (7), 6 states have return successors, (6), 6 states have call predecessors, (6), 4 states have call successors, (6) [2023-11-21 22:15:58,271 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 73 transitions. [2023-11-21 22:15:58,273 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2023-11-21 22:15:58,273 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 22:15:58,273 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 22:15:58,283 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bec4ba6f-630a-4394-bb13-e411895c6049/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-21 22:15:58,483 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bec4ba6f-630a-4394-bb13-e411895c6049/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 22:15:58,484 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 22:15:58,484 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 22:15:58,484 INFO L85 PathProgramCache]: Analyzing trace with hash -558699958, now seen corresponding path program 5 times [2023-11-21 22:15:58,484 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 22:15:58,484 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1966658038] [2023-11-21 22:15:58,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 22:15:58,484 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 22:15:58,510 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-21 22:15:58,510 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [770645101] [2023-11-21 22:15:58,510 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2023-11-21 22:15:58,510 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 22:15:58,510 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bec4ba6f-630a-4394-bb13-e411895c6049/bin/uautomizer-verify-bycVGegfSx/z3 [2023-11-21 22:15:58,511 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bec4ba6f-630a-4394-bb13-e411895c6049/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 22:15:58,513 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bec4ba6f-630a-4394-bb13-e411895c6049/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-21 22:15:59,741 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2023-11-21 22:15:59,741 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-21 22:15:59,748 INFO L262 TraceCheckSpWp]: Trace formula consists of 408 conjuncts, 183 conjunts are in the unsatisfiable core [2023-11-21 22:15:59,754 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 22:15:59,767 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2023-11-21 22:15:59,769 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2023-11-21 22:15:59,779 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2023-11-21 22:15:59,787 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-21 22:16:00,261 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2023-11-21 22:16:00,274 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2023-11-21 22:16:00,451 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 9 [2023-11-21 22:16:00,809 INFO L349 Elim1Store]: treesize reduction 21, result has 34.4 percent of original size [2023-11-21 22:16:00,809 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 25 [2023-11-21 22:16:01,165 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 11 proven. 12 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-21 22:16:01,165 INFO L327 TraceCheckSpWp]: Computing backward predicates...