./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/ldv-linux-4.2-rc1/linux-4.2-rc1.tar.xz-32_7a-drivers--message--fusion--mptctl.ko-entry_point.cil.out.i --full-output --architecture 64bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 63182f13 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/config/TaipanReach.xml -i ../../sv-benchmarks/c/ldv-linux-4.2-rc1/linux-4.2-rc1.tar.xz-32_7a-drivers--message--fusion--mptctl.ko-entry_point.cil.out.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/config/svcomp-Reach-64bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 64bit --witnessprinter.graph.data.programhash 1cfba800a850f13ff72fddf9946e31aec208a19aa4b82d402046e12670b66199 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-63182f1 [2021-11-12 22:21:37,360 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-12 22:21:37,362 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-12 22:21:37,400 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-12 22:21:37,401 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-12 22:21:37,405 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-12 22:21:37,408 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-12 22:21:37,412 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-12 22:21:37,414 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-12 22:21:37,420 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-12 22:21:37,421 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-12 22:21:37,423 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-12 22:21:37,423 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-12 22:21:37,426 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-12 22:21:37,428 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-12 22:21:37,432 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-12 22:21:37,434 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-12 22:21:37,435 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-12 22:21:37,437 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-12 22:21:37,446 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-12 22:21:37,447 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-12 22:21:37,449 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-12 22:21:37,452 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-12 22:21:37,453 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-12 22:21:37,462 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-12 22:21:37,463 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-12 22:21:37,463 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-12 22:21:37,466 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-12 22:21:37,466 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-12 22:21:37,468 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-12 22:21:37,469 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-12 22:21:37,470 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-12 22:21:37,472 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-12 22:21:37,473 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-12 22:21:37,475 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-12 22:21:37,475 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-12 22:21:37,476 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-12 22:21:37,476 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-12 22:21:37,476 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-12 22:21:37,477 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-12 22:21:37,478 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-12 22:21:37,479 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/config/svcomp-Reach-64bit-Taipan_Default.epf [2021-11-12 22:21:37,523 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-12 22:21:37,523 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-12 22:21:37,524 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-12 22:21:37,525 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-12 22:21:37,525 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-12 22:21:37,525 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-12 22:21:37,525 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-12 22:21:37,526 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-12 22:21:37,532 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-12 22:21:37,532 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-12 22:21:37,534 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-12 22:21:37,534 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-12 22:21:37,534 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-12 22:21:37,534 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-12 22:21:37,535 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-12 22:21:37,535 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-12 22:21:37,536 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-12 22:21:37,536 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-12 22:21:37,536 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-12 22:21:37,536 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-12 22:21:37,536 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-12 22:21:37,537 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-12 22:21:37,537 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-12 22:21:37,537 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-12 22:21:37,537 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-12 22:21:37,537 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-12 22:21:37,538 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-12 22:21:37,538 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-12 22:21:37,538 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-12 22:21:37,538 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-12 22:21:37,539 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-12 22:21:37,539 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-12 22:21:37,539 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-12 22:21:37,539 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-12 22:21:37,540 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-12 22:21:37,540 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-12 22:21:37,540 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-12 22:21:37,540 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 1cfba800a850f13ff72fddf9946e31aec208a19aa4b82d402046e12670b66199 [2021-11-12 22:21:37,787 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-12 22:21:37,807 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-12 22:21:37,810 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-12 22:21:37,811 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-12 22:21:37,812 INFO L275 PluginConnector]: CDTParser initialized [2021-11-12 22:21:37,813 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/../../sv-benchmarks/c/ldv-linux-4.2-rc1/linux-4.2-rc1.tar.xz-32_7a-drivers--message--fusion--mptctl.ko-entry_point.cil.out.i [2021-11-12 22:21:37,884 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/data/357910c4a/bb562d18bf43499daec48971d0fbf5c7/FLAG26259a7e8 [2021-11-12 22:21:38,753 INFO L306 CDTParser]: Found 1 translation units. [2021-11-12 22:21:38,754 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/sv-benchmarks/c/ldv-linux-4.2-rc1/linux-4.2-rc1.tar.xz-32_7a-drivers--message--fusion--mptctl.ko-entry_point.cil.out.i [2021-11-12 22:21:38,807 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/data/357910c4a/bb562d18bf43499daec48971d0fbf5c7/FLAG26259a7e8 [2021-11-12 22:21:39,203 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/data/357910c4a/bb562d18bf43499daec48971d0fbf5c7 [2021-11-12 22:21:39,205 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-12 22:21:39,206 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-12 22:21:39,212 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-12 22:21:39,212 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-12 22:21:39,215 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-12 22:21:39,216 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 10:21:39" (1/1) ... [2021-11-12 22:21:39,217 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1d6fd9d9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:21:39, skipping insertion in model container [2021-11-12 22:21:39,218 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 10:21:39" (1/1) ... [2021-11-12 22:21:39,225 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-12 22:21:39,393 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-12 22:21:40,581 WARN L563 CHandler]: More than one settings change for restart is not yet implemented; using only the first one to be reported [2021-11-12 22:21:40,924 WARN L563 CHandler]: More than one settings change for restart is not yet implemented; using only the first one to be reported [2021-11-12 22:21:40,927 WARN L563 CHandler]: More than one settings change for restart is not yet implemented; using only the first one to be reported [2021-11-12 22:21:41,330 WARN L228 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_dba8338d-6be5-4bd3-a485-1864ff8608b4/sv-benchmarks/c/ldv-linux-4.2-rc1/linux-4.2-rc1.tar.xz-32_7a-drivers--message--fusion--mptctl.ko-entry_point.cil.out.i[277952,277965] [2021-11-12 22:21:41,614 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-12 22:21:41,641 ERROR L326 MainTranslator]: Unsupported Syntax: Found a cast between two array/pointer types where the value type is smaller than the cast-to type while using memory model HoenickeLindenmann_Original (while Not using bitvector translation) [2021-11-12 22:21:41,641 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.CACSL2BoogieTranslatorObserver@4dcc0ead and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:21:41, skipping insertion in model container [2021-11-12 22:21:41,642 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-12 22:21:41,642 INFO L184 ToolchainWalker]: Toolchain execution was canceled (user or tool) before executing de.uni_freiburg.informatik.ultimate.boogie.procedureinliner [2021-11-12 22:21:41,645 INFO L158 Benchmark]: Toolchain (without parser) took 2436.60ms. Allocated memory was 134.2MB in the beginning and 188.7MB in the end (delta: 54.5MB). Free memory was 87.4MB in the beginning and 109.6MB in the end (delta: -22.2MB). Peak memory consumption was 38.2MB. Max. memory is 16.1GB. [2021-11-12 22:21:41,646 INFO L158 Benchmark]: CDTParser took 0.27ms. Allocated memory is still 96.5MB. Free memory was 49.7MB in the beginning and 49.6MB in the end (delta: 46.0kB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-12 22:21:41,648 INFO L158 Benchmark]: CACSL2BoogieTranslator took 2430.20ms. Allocated memory was 134.2MB in the beginning and 188.7MB in the end (delta: 54.5MB). Free memory was 87.4MB in the beginning and 109.6MB in the end (delta: -22.2MB). Peak memory consumption was 38.2MB. Max. memory is 16.1GB. [2021-11-12 22:21:41,650 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.27ms. Allocated memory is still 96.5MB. Free memory was 49.7MB in the beginning and 49.6MB in the end (delta: 46.0kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 2430.20ms. Allocated memory was 134.2MB in the beginning and 188.7MB in the end (delta: 54.5MB). Free memory was 87.4MB in the beginning and 109.6MB in the end (delta: -22.2MB). Peak memory consumption was 38.2MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: - UnsupportedSyntaxResult [Line: 5642]: Unsupported Syntax Found a cast between two array/pointer types where the value type is smaller than the cast-to type while using memory model HoenickeLindenmann_Original (while Not using bitvector translation) RESULT: Ultimate could not prove your program: Toolchain returned no result. Received shutdown request... --- End real Ultimate output --- Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis ### Bit-precise run ### Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/config/TaipanReach.xml -i ../../sv-benchmarks/c/ldv-linux-4.2-rc1/linux-4.2-rc1.tar.xz-32_7a-drivers--message--fusion--mptctl.ko-entry_point.cil.out.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/config/svcomp-Reach-64bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 64bit --witnessprinter.graph.data.programhash 1cfba800a850f13ff72fddf9946e31aec208a19aa4b82d402046e12670b66199 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-63182f1 [2021-11-12 22:21:43,920 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-12 22:21:43,922 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-12 22:21:43,967 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-12 22:21:43,968 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-12 22:21:43,972 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-12 22:21:43,974 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-12 22:21:43,979 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-12 22:21:43,982 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-12 22:21:43,990 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-12 22:21:43,992 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-12 22:21:43,993 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-12 22:21:43,994 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-12 22:21:43,997 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-12 22:21:43,999 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-12 22:21:44,005 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-12 22:21:44,007 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-12 22:21:44,008 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-12 22:21:44,011 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-12 22:21:44,021 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-12 22:21:44,023 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-12 22:21:44,025 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-12 22:21:44,028 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-12 22:21:44,030 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-12 22:21:44,039 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-12 22:21:44,040 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-12 22:21:44,040 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-12 22:21:44,042 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-12 22:21:44,042 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-12 22:21:44,043 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-12 22:21:44,044 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-12 22:21:44,045 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-12 22:21:44,047 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-12 22:21:44,048 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-12 22:21:44,049 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-12 22:21:44,049 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-12 22:21:44,060 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-12 22:21:44,060 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-12 22:21:44,061 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-12 22:21:44,062 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-12 22:21:44,062 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-12 22:21:44,063 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/config/svcomp-Reach-64bit-Taipan_Bitvector.epf [2021-11-12 22:21:44,094 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-12 22:21:44,094 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-12 22:21:44,096 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-12 22:21:44,096 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-12 22:21:44,096 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-12 22:21:44,097 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-12 22:21:44,097 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-12 22:21:44,097 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-12 22:21:44,097 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-12 22:21:44,098 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-12 22:21:44,100 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-12 22:21:44,100 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-12 22:21:44,100 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-12 22:21:44,101 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-12 22:21:44,101 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-12 22:21:44,101 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-12 22:21:44,101 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-12 22:21:44,102 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-12 22:21:44,102 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-12 22:21:44,102 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-12 22:21:44,102 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-12 22:21:44,102 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-12 22:21:44,103 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-12 22:21:44,103 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-12 22:21:44,103 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-12 22:21:44,103 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-12 22:21:44,104 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-12 22:21:44,104 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-12 22:21:44,104 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-12 22:21:44,104 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-12 22:21:44,105 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-12 22:21:44,105 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-12 22:21:44,105 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-12 22:21:44,105 INFO L138 SettingsManager]: * Logic for external solver=AUFBV 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_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 1cfba800a850f13ff72fddf9946e31aec208a19aa4b82d402046e12670b66199 [2021-11-12 22:21:44,556 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-12 22:21:44,579 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-12 22:21:44,582 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-12 22:21:44,583 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-12 22:21:44,584 INFO L275 PluginConnector]: CDTParser initialized [2021-11-12 22:21:44,585 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/../../sv-benchmarks/c/ldv-linux-4.2-rc1/linux-4.2-rc1.tar.xz-32_7a-drivers--message--fusion--mptctl.ko-entry_point.cil.out.i [2021-11-12 22:21:44,672 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/data/b7986e4ef/9be9c7d6b46d499f968302fb290fc678/FLAG415ee1fde [2021-11-12 22:21:45,666 INFO L306 CDTParser]: Found 1 translation units. [2021-11-12 22:21:45,667 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/sv-benchmarks/c/ldv-linux-4.2-rc1/linux-4.2-rc1.tar.xz-32_7a-drivers--message--fusion--mptctl.ko-entry_point.cil.out.i [2021-11-12 22:21:45,724 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/data/b7986e4ef/9be9c7d6b46d499f968302fb290fc678/FLAG415ee1fde [2021-11-12 22:21:46,074 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/data/b7986e4ef/9be9c7d6b46d499f968302fb290fc678 [2021-11-12 22:21:46,078 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-12 22:21:46,083 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-12 22:21:46,088 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-12 22:21:46,088 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-12 22:21:46,092 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-12 22:21:46,093 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 10:21:46" (1/1) ... [2021-11-12 22:21:46,094 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5c984a50 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:21:46, skipping insertion in model container [2021-11-12 22:21:46,095 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 10:21:46" (1/1) ... [2021-11-12 22:21:46,102 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-12 22:21:46,284 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-12 22:21:48,536 WARN L228 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_dba8338d-6be5-4bd3-a485-1864ff8608b4/sv-benchmarks/c/ldv-linux-4.2-rc1/linux-4.2-rc1.tar.xz-32_7a-drivers--message--fusion--mptctl.ko-entry_point.cil.out.i[277952,277965] [2021-11-12 22:21:48,809 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-12 22:21:48,849 INFO L200 MainTranslator]: Restarting translation with changed settings: SettingsChange [mNewPreferredMemoryModel=HoenickeLindenmann_1ByteResolution] [2021-11-12 22:21:48,903 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-12 22:21:49,435 WARN L228 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_dba8338d-6be5-4bd3-a485-1864ff8608b4/sv-benchmarks/c/ldv-linux-4.2-rc1/linux-4.2-rc1.tar.xz-32_7a-drivers--message--fusion--mptctl.ko-entry_point.cil.out.i[277952,277965] [2021-11-12 22:21:49,467 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-12 22:21:49,494 INFO L203 MainTranslator]: Completed pre-run [2021-11-12 22:21:49,928 WARN L228 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_dba8338d-6be5-4bd3-a485-1864ff8608b4/sv-benchmarks/c/ldv-linux-4.2-rc1/linux-4.2-rc1.tar.xz-32_7a-drivers--message--fusion--mptctl.ko-entry_point.cil.out.i[277952,277965] [2021-11-12 22:21:49,953 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-12 22:21:50,079 INFO L208 MainTranslator]: Completed translation [2021-11-12 22:21:50,080 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:21:50 WrapperNode [2021-11-12 22:21:50,081 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-12 22:21:50,082 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-12 22:21:50,082 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-12 22:21:50,082 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-12 22:21:50,090 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:21:50" (1/1) ... [2021-11-12 22:21:50,232 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:21:50" (1/1) ... [2021-11-12 22:21:50,388 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-12 22:21:50,389 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-12 22:21:50,389 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-12 22:21:50,389 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-12 22:21:50,398 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:21:50" (1/1) ... [2021-11-12 22:21:50,398 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:21:50" (1/1) ... [2021-11-12 22:21:50,421 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:21:50" (1/1) ... [2021-11-12 22:21:50,422 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:21:50" (1/1) ... [2021-11-12 22:21:50,546 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:21:50" (1/1) ... [2021-11-12 22:21:50,578 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:21:50" (1/1) ... [2021-11-12 22:21:50,622 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:21:50" (1/1) ... [2021-11-12 22:21:50,649 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-12 22:21:50,650 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-12 22:21:50,650 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-12 22:21:50,650 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-12 22:21:50,658 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:21:50" (1/1) ... [2021-11-12 22:21:50,666 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-12 22:21:50,676 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:21:50,689 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-12 22:21:50,711 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-12 22:21:50,743 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE1 [2021-11-12 22:21:50,743 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE8 [2021-11-12 22:21:50,743 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE4 [2021-11-12 22:21:50,743 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE2 [2021-11-12 22:21:50,747 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_stop [2021-11-12 22:21:50,748 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_stop [2021-11-12 22:21:50,748 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.meminit [2021-11-12 22:21:50,748 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.meminit [2021-11-12 22:21:50,748 INFO L130 BoogieDeclarations]: Found specification of procedure ##fun~$Pointer$~X~~u32~0~X~~dma_addr_t~0~TO~VOID [2021-11-12 22:21:50,748 INFO L138 BoogieDeclarations]: Found implementation of procedure ##fun~$Pointer$~X~~u32~0~X~~dma_addr_t~0~TO~VOID [2021-11-12 22:21:50,749 INFO L130 BoogieDeclarations]: Found specification of procedure wait_for_completion_timeout [2021-11-12 22:21:50,749 INFO L138 BoogieDeclarations]: Found implementation of procedure wait_for_completion_timeout [2021-11-12 22:21:50,749 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_mutex_lock_mpctl_mutex [2021-11-12 22:21:50,749 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_mutex_lock_mpctl_mutex [2021-11-12 22:21:50,749 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_malloc [2021-11-12 22:21:50,750 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_malloc [2021-11-12 22:21:50,750 INFO L130 BoogieDeclarations]: Found specification of procedure mpt_GetIocState [2021-11-12 22:21:50,750 INFO L138 BoogieDeclarations]: Found implementation of procedure mpt_GetIocState [2021-11-12 22:21:50,750 INFO L130 BoogieDeclarations]: Found specification of procedure mutex_trylock [2021-11-12 22:21:50,750 INFO L138 BoogieDeclarations]: Found implementation of procedure mutex_trylock [2021-11-12 22:21:50,750 INFO L130 BoogieDeclarations]: Found specification of procedure __scsi_iterate_devices [2021-11-12 22:21:50,751 INFO L138 BoogieDeclarations]: Found implementation of procedure __scsi_iterate_devices [2021-11-12 22:21:50,751 INFO L130 BoogieDeclarations]: Found specification of procedure mutex_unlock [2021-11-12 22:21:50,751 INFO L138 BoogieDeclarations]: Found implementation of procedure mutex_unlock [2021-11-12 22:21:50,751 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_error [2021-11-12 22:21:50,751 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_error [2021-11-12 22:21:50,752 INFO L130 BoogieDeclarations]: Found specification of procedure mptctl_syscall_down [2021-11-12 22:21:50,752 INFO L138 BoogieDeclarations]: Found implementation of procedure mptctl_syscall_down [2021-11-12 22:21:50,752 INFO L130 BoogieDeclarations]: Found specification of procedure mpt_device_driver_deregister [2021-11-12 22:21:50,752 INFO L138 BoogieDeclarations]: Found implementation of procedure mpt_device_driver_deregister [2021-11-12 22:21:50,752 INFO L130 BoogieDeclarations]: Found specification of procedure valid_dma_direction [2021-11-12 22:21:50,752 INFO L138 BoogieDeclarations]: Found implementation of procedure valid_dma_direction [2021-11-12 22:21:50,753 INFO L130 BoogieDeclarations]: Found specification of procedure mptctl_remove [2021-11-12 22:21:50,753 INFO L138 BoogieDeclarations]: Found implementation of procedure mptctl_remove [2021-11-12 22:21:50,753 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.C_memset [2021-11-12 22:21:50,753 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.C_memset [2021-11-12 22:21:50,754 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-11-12 22:21:50,754 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-11-12 22:21:50,754 INFO L130 BoogieDeclarations]: Found specification of procedure mpt_put_msg_frame [2021-11-12 22:21:50,755 INFO L138 BoogieDeclarations]: Found implementation of procedure mpt_put_msg_frame [2021-11-12 22:21:50,755 INFO L130 BoogieDeclarations]: Found specification of procedure pci_alloc_consistent [2021-11-12 22:21:50,755 INFO L138 BoogieDeclarations]: Found implementation of procedure pci_alloc_consistent [2021-11-12 22:21:50,755 INFO L130 BoogieDeclarations]: Found specification of procedure mutex_lock [2021-11-12 22:21:50,755 INFO L138 BoogieDeclarations]: Found implementation of procedure mutex_lock [2021-11-12 22:21:50,755 INFO L130 BoogieDeclarations]: Found specification of procedure spinlock_check [2021-11-12 22:21:50,756 INFO L138 BoogieDeclarations]: Found implementation of procedure spinlock_check [2021-11-12 22:21:50,756 INFO L130 BoogieDeclarations]: Found specification of procedure __mptctl_ioctl [2021-11-12 22:21:50,756 INFO L138 BoogieDeclarations]: Found implementation of procedure __mptctl_ioctl [2021-11-12 22:21:50,756 INFO L130 BoogieDeclarations]: Found specification of procedure mptctl_do_mpt_command [2021-11-12 22:21:50,756 INFO L138 BoogieDeclarations]: Found implementation of procedure mptctl_do_mpt_command [2021-11-12 22:21:50,757 INFO L130 BoogieDeclarations]: Found specification of procedure mptctl_do_fw_download [2021-11-12 22:21:50,757 INFO L138 BoogieDeclarations]: Found implementation of procedure mptctl_do_fw_download [2021-11-12 22:21:50,758 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-12 22:21:50,759 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-11-12 22:21:50,760 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_mutex_unlock_mutex_of__MPT_MGMT [2021-11-12 22:21:50,760 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_mutex_unlock_mutex_of__MPT_MGMT [2021-11-12 22:21:50,760 INFO L130 BoogieDeclarations]: Found specification of procedure mpt_put_msg_frame_hi_pri [2021-11-12 22:21:50,760 INFO L138 BoogieDeclarations]: Found implementation of procedure mpt_put_msg_frame_hi_pri [2021-11-12 22:21:50,761 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_is_err [2021-11-12 22:21:50,762 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_is_err [2021-11-12 22:21:50,762 INFO L130 BoogieDeclarations]: Found specification of procedure spin_unlock_irqrestore [2021-11-12 22:21:50,762 INFO L138 BoogieDeclarations]: Found implementation of procedure spin_unlock_irqrestore [2021-11-12 22:21:50,763 INFO L130 BoogieDeclarations]: Found specification of procedure mpt_free_fw_memory [2021-11-12 22:21:50,763 INFO L138 BoogieDeclarations]: Found implementation of procedure mpt_free_fw_memory [2021-11-12 22:21:50,763 INFO L130 BoogieDeclarations]: Found specification of procedure mptctl_do_taskmgmt [2021-11-12 22:21:50,763 INFO L138 BoogieDeclarations]: Found implementation of procedure mptctl_do_taskmgmt [2021-11-12 22:21:50,763 INFO L130 BoogieDeclarations]: Found specification of procedure pci_unmap_single [2021-11-12 22:21:50,763 INFO L138 BoogieDeclarations]: Found implementation of procedure pci_unmap_single [2021-11-12 22:21:50,764 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE8 [2021-11-12 22:21:50,765 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE1 [2021-11-12 22:21:50,765 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE2 [2021-11-12 22:21:50,765 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-12 22:21:50,765 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE4 [2021-11-12 22:21:50,765 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-11-12 22:21:50,766 INFO L130 BoogieDeclarations]: Found specification of procedure mpt_clear_taskmgmt_in_progress_flag [2021-11-12 22:21:50,766 INFO L138 BoogieDeclarations]: Found implementation of procedure mpt_clear_taskmgmt_in_progress_flag [2021-11-12 22:21:50,766 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE2 [2021-11-12 22:21:50,766 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-12 22:21:50,766 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE4 [2021-11-12 22:21:50,766 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE8 [2021-11-12 22:21:50,767 INFO L130 BoogieDeclarations]: Found specification of procedure mptctl_timeout_expired [2021-11-12 22:21:50,767 INFO L138 BoogieDeclarations]: Found implementation of procedure mptctl_timeout_expired [2021-11-12 22:21:50,767 INFO L130 BoogieDeclarations]: Found specification of procedure __might_fault [2021-11-12 22:21:50,767 INFO L138 BoogieDeclarations]: Found implementation of procedure __might_fault [2021-11-12 22:21:50,767 INFO L130 BoogieDeclarations]: Found specification of procedure kzalloc [2021-11-12 22:21:50,769 INFO L138 BoogieDeclarations]: Found implementation of procedure kzalloc [2021-11-12 22:21:50,769 INFO L130 BoogieDeclarations]: Found specification of procedure _raw_spin_lock_irqsave [2021-11-12 22:21:50,769 INFO L138 BoogieDeclarations]: Found implementation of procedure _raw_spin_lock_irqsave [2021-11-12 22:21:50,770 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_mutex_unlock_mpctl_mutex [2021-11-12 22:21:50,770 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_mutex_unlock_mpctl_mutex [2021-11-12 22:21:50,770 INFO L130 BoogieDeclarations]: Found specification of procedure mptctl_fasync [2021-11-12 22:21:50,771 INFO L138 BoogieDeclarations]: Found implementation of procedure mptctl_fasync [2021-11-12 22:21:50,771 INFO L130 BoogieDeclarations]: Found specification of procedure get_dma_ops [2021-11-12 22:21:50,772 INFO L138 BoogieDeclarations]: Found implementation of procedure get_dma_ops [2021-11-12 22:21:50,772 INFO L130 BoogieDeclarations]: Found specification of procedure misc_deregister [2021-11-12 22:21:50,773 INFO L138 BoogieDeclarations]: Found implementation of procedure misc_deregister [2021-11-12 22:21:50,773 INFO L130 BoogieDeclarations]: Found specification of procedure mpt_set_taskmgmt_in_progress_flag [2021-11-12 22:21:50,773 INFO L138 BoogieDeclarations]: Found implementation of procedure mpt_set_taskmgmt_in_progress_flag [2021-11-12 22:21:50,773 INFO L130 BoogieDeclarations]: Found specification of procedure __phys_addr [2021-11-12 22:21:50,773 INFO L138 BoogieDeclarations]: Found implementation of procedure __phys_addr [2021-11-12 22:21:50,774 INFO L130 BoogieDeclarations]: Found specification of procedure mpt_verify_adapter [2021-11-12 22:21:50,774 INFO L138 BoogieDeclarations]: Found implementation of procedure mpt_verify_adapter [2021-11-12 22:21:50,774 INFO L130 BoogieDeclarations]: Found specification of procedure kfree [2021-11-12 22:21:50,774 INFO L138 BoogieDeclarations]: Found implementation of procedure kfree [2021-11-12 22:21:50,775 INFO L130 BoogieDeclarations]: Found specification of procedure pci_free_consistent [2021-11-12 22:21:50,775 INFO L138 BoogieDeclarations]: Found implementation of procedure pci_free_consistent [2021-11-12 22:21:50,775 INFO L130 BoogieDeclarations]: Found specification of procedure copy_to_user [2021-11-12 22:21:50,775 INFO L138 BoogieDeclarations]: Found implementation of procedure copy_to_user [2021-11-12 22:21:50,776 INFO L130 BoogieDeclarations]: Found specification of procedure mpt_deregister [2021-11-12 22:21:50,776 INFO L138 BoogieDeclarations]: Found implementation of procedure mpt_deregister [2021-11-12 22:21:50,776 INFO L130 BoogieDeclarations]: Found specification of procedure kfree_sgl [2021-11-12 22:21:50,776 INFO L138 BoogieDeclarations]: Found implementation of procedure kfree_sgl [2021-11-12 22:21:50,777 INFO L130 BoogieDeclarations]: Found specification of procedure ldv__builtin_expect [2021-11-12 22:21:50,778 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv__builtin_expect [2021-11-12 22:21:50,781 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_init_zalloc [2021-11-12 22:21:50,781 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_init_zalloc [2021-11-12 22:21:50,781 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-12 22:21:50,781 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_memset [2021-11-12 22:21:50,783 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_memset [2021-11-12 22:21:50,784 INFO L130 BoogieDeclarations]: Found specification of procedure copy_from_user [2021-11-12 22:21:50,784 INFO L138 BoogieDeclarations]: Found implementation of procedure copy_from_user [2021-11-12 22:21:50,784 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_undef_int [2021-11-12 22:21:50,784 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_undef_int [2021-11-12 22:21:50,790 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-11-12 22:21:50,790 INFO L130 BoogieDeclarations]: Found specification of procedure mpt_get_msg_frame [2021-11-12 22:21:50,790 INFO L138 BoogieDeclarations]: Found implementation of procedure mpt_get_msg_frame [2021-11-12 22:21:50,790 INFO L130 BoogieDeclarations]: Found specification of procedure PTR_ERR [2021-11-12 22:21:50,791 INFO L138 BoogieDeclarations]: Found implementation of procedure PTR_ERR [2021-11-12 22:21:50,791 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_mutex_lock_mutex_of__MPT_MGMT [2021-11-12 22:21:50,791 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_mutex_lock_mutex_of__MPT_MGMT [2021-11-12 22:21:50,791 INFO L130 BoogieDeclarations]: Found specification of procedure mpt_send_handshake_request [2021-11-12 22:21:50,791 INFO L138 BoogieDeclarations]: Found implementation of procedure mpt_send_handshake_request [2021-11-12 22:21:50,791 INFO L130 BoogieDeclarations]: Found specification of procedure mpt_register [2021-11-12 22:21:50,791 INFO L138 BoogieDeclarations]: Found implementation of procedure mpt_register [2021-11-12 22:21:50,792 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_mutex_trylock_mutex_of__MPT_MGMT [2021-11-12 22:21:50,792 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_mutex_trylock_mutex_of__MPT_MGMT [2021-11-12 22:21:50,792 INFO L130 BoogieDeclarations]: Found specification of procedure shost_priv [2021-11-12 22:21:50,792 INFO L138 BoogieDeclarations]: Found implementation of procedure shost_priv [2021-11-12 22:21:50,792 INFO L130 BoogieDeclarations]: Found specification of procedure strncpy [2021-11-12 22:21:50,792 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-12 22:21:50,793 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-12 22:21:50,793 INFO L130 BoogieDeclarations]: Found specification of procedure mpt_config [2021-11-12 22:21:50,793 INFO L138 BoogieDeclarations]: Found implementation of procedure mpt_config [2021-11-12 22:21:50,793 INFO L130 BoogieDeclarations]: Found specification of procedure mpt_free_msg_frame [2021-11-12 22:21:50,793 INFO L138 BoogieDeclarations]: Found implementation of procedure mpt_free_msg_frame [2021-11-12 22:21:50,793 INFO L130 BoogieDeclarations]: Found specification of procedure IS_ERR [2021-11-12 22:21:50,793 INFO L138 BoogieDeclarations]: Found implementation of procedure IS_ERR [2021-11-12 22:22:02,818 INFO L766 $ProcedureCfgBuilder]: dead code at ProgramPoint ldv_stopFINAL: assume true; [2021-11-12 22:22:47,102 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-12 22:22:47,102 INFO L299 CfgBuilder]: Removed 0 assume(true) statements. [2021-11-12 22:22:47,107 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 10:22:47 BoogieIcfgContainer [2021-11-12 22:22:47,108 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-12 22:22:47,110 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-12 22:22:47,110 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-12 22:22:47,114 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-12 22:22:47,114 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.11 10:21:46" (1/3) ... [2021-11-12 22:22:47,115 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@922a43b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 10:22:47, skipping insertion in model container [2021-11-12 22:22:47,115 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:21:50" (2/3) ... [2021-11-12 22:22:47,116 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@922a43b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 10:22:47, skipping insertion in model container [2021-11-12 22:22:47,116 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 10:22:47" (3/3) ... [2021-11-12 22:22:47,117 INFO L111 eAbstractionObserver]: Analyzing ICFG linux-4.2-rc1.tar.xz-32_7a-drivers--message--fusion--mptctl.ko-entry_point.cil.out.i [2021-11-12 22:22:47,124 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-12 22:22:47,124 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-12 22:22:47,191 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-12 22:22:47,198 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, 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, mLoopAccelerationTechnique=FAST_UPR [2021-11-12 22:22:47,199 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-12 22:22:47,258 INFO L276 IsEmpty]: Start isEmpty. Operand has 1328 states, 997 states have (on average 1.415245737211635) internal successors, (1411), 1017 states have internal predecessors, (1411), 267 states have call successors, (267), 63 states have call predecessors, (267), 62 states have return successors, (263), 262 states have call predecessors, (263), 263 states have call successors, (263) [2021-11-12 22:22:47,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2021-11-12 22:22:47,272 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:22:47,273 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:22:47,274 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:22:47,280 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:22:47,281 INFO L85 PathProgramCache]: Analyzing trace with hash -811675881, now seen corresponding path program 1 times [2021-11-12 22:22:47,305 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:22:47,306 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1363102233] [2021-11-12 22:22:47,306 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:22:47,307 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:22:47,308 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:22:47,311 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:22:47,324 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-12 22:22:52,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:22:52,595 INFO L263 TraceCheckSpWp]: Trace formula consists of 1476 conjuncts, 1 conjunts are in the unsatisfiable core [2021-11-12 22:22:52,609 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:22:53,253 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 252 trivial. 0 not checked. [2021-11-12 22:22:53,254 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:22:53,785 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 252 trivial. 0 not checked. [2021-11-12 22:22:53,786 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:22:53,786 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1363102233] [2021-11-12 22:22:53,786 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1363102233] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 22:22:53,787 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-12 22:22:53,787 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2021-11-12 22:22:53,789 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [617096903] [2021-11-12 22:22:53,789 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 22:22:53,798 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-12 22:22:53,799 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:22:53,838 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-12 22:22:53,839 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-12 22:22:53,846 INFO L87 Difference]: Start difference. First operand has 1328 states, 997 states have (on average 1.415245737211635) internal successors, (1411), 1017 states have internal predecessors, (1411), 267 states have call successors, (267), 63 states have call predecessors, (267), 62 states have return successors, (263), 262 states have call predecessors, (263), 263 states have call successors, (263) Second operand has 2 states, 2 states have (on average 21.5) internal successors, (43), 2 states have internal predecessors, (43), 2 states have call successors, (23), 2 states have call predecessors, (23), 2 states have return successors, (21), 2 states have call predecessors, (21), 2 states have call successors, (21) [2021-11-12 22:22:54,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:22:54,041 INFO L93 Difference]: Finished difference Result 2651 states and 3946 transitions. [2021-11-12 22:22:54,042 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-12 22:22:54,044 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 21.5) internal successors, (43), 2 states have internal predecessors, (43), 2 states have call successors, (23), 2 states have call predecessors, (23), 2 states have return successors, (21), 2 states have call predecessors, (21), 2 states have call successors, (21) Word has length 119 [2021-11-12 22:22:54,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:22:54,083 INFO L225 Difference]: With dead ends: 2651 [2021-11-12 22:22:54,083 INFO L226 Difference]: Without dead ends: 1315 [2021-11-12 22:22:54,103 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 236 GetRequests, 236 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-12 22:22:54,107 INFO L933 BasicCegarLoop]: 1927 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.00ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 1927 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 13.99ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.00ms IncrementalHoareTripleChecker+Time [2021-11-12 22:22:54,110 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 1927 Invalid, 0 Unknown, 0 Unchecked, 13.99ms Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.00ms Time] [2021-11-12 22:22:54,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1315 states. [2021-11-12 22:22:54,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1315 to 1315. [2021-11-12 22:22:54,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1315 states, 990 states have (on average 1.4090909090909092) internal successors, (1395), 1004 states have internal predecessors, (1395), 263 states have call successors, (263), 62 states have call predecessors, (263), 61 states have return successors, (252), 251 states have call predecessors, (252), 252 states have call successors, (252) [2021-11-12 22:22:54,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1315 states to 1315 states and 1910 transitions. [2021-11-12 22:22:54,309 INFO L78 Accepts]: Start accepts. Automaton has 1315 states and 1910 transitions. Word has length 119 [2021-11-12 22:22:54,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:22:54,309 INFO L470 AbstractCegarLoop]: Abstraction has 1315 states and 1910 transitions. [2021-11-12 22:22:54,310 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 21.5) internal successors, (43), 2 states have internal predecessors, (43), 2 states have call successors, (23), 2 states have call predecessors, (23), 2 states have return successors, (21), 2 states have call predecessors, (21), 2 states have call successors, (21) [2021-11-12 22:22:54,310 INFO L276 IsEmpty]: Start isEmpty. Operand 1315 states and 1910 transitions. [2021-11-12 22:22:54,326 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2021-11-12 22:22:54,328 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:22:54,329 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:22:54,376 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-12 22:22:54,529 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 22:22:54,530 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:22:54,531 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:22:54,531 INFO L85 PathProgramCache]: Analyzing trace with hash 1510126037, now seen corresponding path program 1 times [2021-11-12 22:22:54,535 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:22:54,535 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1488514643] [2021-11-12 22:22:54,535 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:22:54,535 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:22:54,536 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:22:54,537 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:22:54,540 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-12 22:22:59,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:22:59,389 INFO L263 TraceCheckSpWp]: Trace formula consists of 1476 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-12 22:22:59,397 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:23:00,054 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 63 proven. 0 refuted. 0 times theorem prover too weak. 189 trivial. 0 not checked. [2021-11-12 22:23:00,054 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:23:01,031 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 203 trivial. 0 not checked. [2021-11-12 22:23:01,031 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:23:01,031 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1488514643] [2021-11-12 22:23:01,034 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1488514643] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 22:23:01,037 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-12 22:23:01,037 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 9 [2021-11-12 22:23:01,038 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1267310678] [2021-11-12 22:23:01,039 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:23:01,041 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-12 22:23:01,042 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:23:01,043 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-12 22:23:01,043 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2021-11-12 22:23:01,044 INFO L87 Difference]: Start difference. First operand 1315 states and 1910 transitions. Second operand has 6 states, 5 states have (on average 8.6) internal successors, (43), 6 states have internal predecessors, (43), 3 states have call successors, (15), 2 states have call predecessors, (15), 4 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) [2021-11-12 22:23:01,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:23:01,686 INFO L93 Difference]: Finished difference Result 2630 states and 3840 transitions. [2021-11-12 22:23:01,686 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-12 22:23:01,687 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 8.6) internal successors, (43), 6 states have internal predecessors, (43), 3 states have call successors, (15), 2 states have call predecessors, (15), 4 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) Word has length 119 [2021-11-12 22:23:01,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:23:01,698 INFO L225 Difference]: With dead ends: 2630 [2021-11-12 22:23:01,699 INFO L226 Difference]: Without dead ends: 1316 [2021-11-12 22:23:01,706 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 238 GetRequests, 229 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2021-11-12 22:23:01,707 INFO L933 BasicCegarLoop]: 1899 mSDtfsCounter, 6 mSDsluCounter, 7572 mSDsCounter, 0 mSdLazyCounter, 74 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 379.90ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 9471 SdHoareTripleChecker+Invalid, 83 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 35.44ms SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 74 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 422.95ms IncrementalHoareTripleChecker+Time [2021-11-12 22:23:01,708 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 9471 Invalid, 83 Unknown, 0 Unchecked, 35.44ms Time], IncrementalHoareTripleChecker [9 Valid, 74 Invalid, 0 Unknown, 0 Unchecked, 422.95ms Time] [2021-11-12 22:23:01,712 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1316 states. [2021-11-12 22:23:01,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1316 to 1316. [2021-11-12 22:23:01,766 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1316 states, 991 states have (on average 1.408678102926337) internal successors, (1396), 1005 states have internal predecessors, (1396), 263 states have call successors, (263), 62 states have call predecessors, (263), 61 states have return successors, (252), 251 states have call predecessors, (252), 252 states have call successors, (252) [2021-11-12 22:23:01,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1316 states to 1316 states and 1911 transitions. [2021-11-12 22:23:01,784 INFO L78 Accepts]: Start accepts. Automaton has 1316 states and 1911 transitions. Word has length 119 [2021-11-12 22:23:01,786 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:23:01,786 INFO L470 AbstractCegarLoop]: Abstraction has 1316 states and 1911 transitions. [2021-11-12 22:23:01,786 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 8.6) internal successors, (43), 6 states have internal predecessors, (43), 3 states have call successors, (15), 2 states have call predecessors, (15), 4 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) [2021-11-12 22:23:01,786 INFO L276 IsEmpty]: Start isEmpty. Operand 1316 states and 1911 transitions. [2021-11-12 22:23:01,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2021-11-12 22:23:01,789 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:23:01,790 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:23:01,836 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-12 22:23:01,990 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 22:23:01,991 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:23:01,991 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:23:01,991 INFO L85 PathProgramCache]: Analyzing trace with hash -679111347, now seen corresponding path program 1 times [2021-11-12 22:23:01,994 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:23:01,994 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1111172932] [2021-11-12 22:23:01,994 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:23:01,995 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:23:01,995 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:23:01,996 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:23:01,998 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-12 22:23:07,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:23:07,259 INFO L263 TraceCheckSpWp]: Trace formula consists of 1516 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 22:23:07,267 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:23:08,026 INFO L134 CoverageAnalysis]: Checked inductivity of 344 backedges. 84 proven. 1 refuted. 0 times theorem prover too weak. 259 trivial. 0 not checked. [2021-11-12 22:23:08,026 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:23:09,144 INFO L134 CoverageAnalysis]: Checked inductivity of 344 backedges. 0 proven. 71 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2021-11-12 22:23:09,144 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:23:09,144 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1111172932] [2021-11-12 22:23:09,144 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1111172932] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:23:09,145 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1245124491] [2021-11-12 22:23:09,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:23:09,145 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:23:09,145 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:23:09,153 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:23:09,175 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (5)] Waiting until timeout for monitored process [2021-11-12 22:23:11,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:23:11,248 INFO L263 TraceCheckSpWp]: Trace formula consists of 1516 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 22:23:11,253 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:23:11,673 INFO L134 CoverageAnalysis]: Checked inductivity of 344 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 344 trivial. 0 not checked. [2021-11-12 22:23:11,673 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:23:12,001 INFO L134 CoverageAnalysis]: Checked inductivity of 344 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 344 trivial. 0 not checked. [2021-11-12 22:23:12,001 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1245124491] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 22:23:12,001 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 22:23:12,002 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [7, 7] total 12 [2021-11-12 22:23:12,002 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1009820278] [2021-11-12 22:23:12,002 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 22:23:12,004 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 22:23:12,005 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:23:12,006 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 22:23:12,007 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-11-12 22:23:12,007 INFO L87 Difference]: Start difference. First operand 1316 states and 1911 transitions. Second operand has 3 states, 3 states have (on average 12.666666666666666) internal successors, (38), 3 states have internal predecessors, (38), 2 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 1 states have call predecessors, (12), 1 states have call successors, (12) [2021-11-12 22:23:12,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:23:12,573 INFO L93 Difference]: Finished difference Result 2708 states and 3910 transitions. [2021-11-12 22:23:12,573 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 22:23:12,573 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 12.666666666666666) internal successors, (38), 3 states have internal predecessors, (38), 2 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 1 states have call predecessors, (12), 1 states have call successors, (12) Word has length 127 [2021-11-12 22:23:12,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:23:12,586 INFO L225 Difference]: With dead ends: 2708 [2021-11-12 22:23:12,586 INFO L226 Difference]: Without dead ends: 1418 [2021-11-12 22:23:12,594 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 504 GetRequests, 494 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-11-12 22:23:12,597 INFO L933 BasicCegarLoop]: 1943 mSDtfsCounter, 160 mSDsluCounter, 1836 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 392.01ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 160 SdHoareTripleChecker+Valid, 3779 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 11.69ms SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 465.67ms IncrementalHoareTripleChecker+Time [2021-11-12 22:23:12,600 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [160 Valid, 3779 Invalid, 30 Unknown, 0 Unchecked, 11.69ms Time], IncrementalHoareTripleChecker [6 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 465.67ms Time] [2021-11-12 22:23:12,604 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1418 states. [2021-11-12 22:23:12,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1418 to 1402. [2021-11-12 22:23:12,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1402 states, 1056 states have (on average 1.4005681818181819) internal successors, (1479), 1071 states have internal predecessors, (1479), 273 states have call successors, (273), 73 states have call predecessors, (273), 72 states have return successors, (262), 260 states have call predecessors, (262), 262 states have call successors, (262) [2021-11-12 22:23:12,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1402 states to 1402 states and 2014 transitions. [2021-11-12 22:23:12,667 INFO L78 Accepts]: Start accepts. Automaton has 1402 states and 2014 transitions. Word has length 127 [2021-11-12 22:23:12,668 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:23:12,668 INFO L470 AbstractCegarLoop]: Abstraction has 1402 states and 2014 transitions. [2021-11-12 22:23:12,669 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 12.666666666666666) internal successors, (38), 3 states have internal predecessors, (38), 2 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 1 states have call predecessors, (12), 1 states have call successors, (12) [2021-11-12 22:23:12,669 INFO L276 IsEmpty]: Start isEmpty. Operand 1402 states and 2014 transitions. [2021-11-12 22:23:12,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2021-11-12 22:23:12,673 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:23:12,673 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:23:12,714 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-12 22:23:12,917 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (5)] Forceful destruction successful, exit code 0 [2021-11-12 22:23:13,095 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 22:23:13,095 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:23:13,096 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:23:13,096 INFO L85 PathProgramCache]: Analyzing trace with hash 788790866, now seen corresponding path program 1 times [2021-11-12 22:23:13,100 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:23:13,100 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1793952671] [2021-11-12 22:23:13,100 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:23:13,100 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:23:13,100 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:23:13,101 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:23:13,103 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-12 22:23:17,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:23:18,052 INFO L263 TraceCheckSpWp]: Trace formula consists of 1537 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 22:23:18,057 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:23:18,795 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 84 proven. 1 refuted. 0 times theorem prover too weak. 262 trivial. 0 not checked. [2021-11-12 22:23:18,795 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:23:19,943 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 0 proven. 71 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2021-11-12 22:23:19,944 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:23:19,944 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1793952671] [2021-11-12 22:23:19,944 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1793952671] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:23:19,944 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [726205243] [2021-11-12 22:23:19,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:23:19,944 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:23:19,944 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:23:19,945 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:23:19,946 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (7)] Waiting until timeout for monitored process [2021-11-12 22:23:21,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:23:21,947 INFO L263 TraceCheckSpWp]: Trace formula consists of 1537 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 22:23:21,953 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:23:23,038 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 347 trivial. 0 not checked. [2021-11-12 22:23:23,038 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:23:23,595 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 347 trivial. 0 not checked. [2021-11-12 22:23:23,595 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [726205243] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 22:23:23,595 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 22:23:23,596 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 3] imperfect sequences [7, 7] total 12 [2021-11-12 22:23:23,596 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1068237092] [2021-11-12 22:23:23,596 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 22:23:23,597 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 22:23:23,597 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:23:23,597 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 22:23:23,597 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-11-12 22:23:23,597 INFO L87 Difference]: Start difference. First operand 1402 states and 2014 transitions. Second operand has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 3 states have internal predecessors, (70), 3 states have call successors, (33), 3 states have call predecessors, (33), 2 states have return successors, (32), 2 states have call predecessors, (32), 2 states have call successors, (32) [2021-11-12 22:23:23,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:23:23,674 INFO L93 Difference]: Finished difference Result 1404 states and 2015 transitions. [2021-11-12 22:23:23,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 22:23:23,674 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 3 states have internal predecessors, (70), 3 states have call successors, (33), 3 states have call predecessors, (33), 2 states have return successors, (32), 2 states have call predecessors, (32), 2 states have call successors, (32) Word has length 146 [2021-11-12 22:23:23,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:23:23,686 INFO L225 Difference]: With dead ends: 1404 [2021-11-12 22:23:23,687 INFO L226 Difference]: Without dead ends: 1401 [2021-11-12 22:23:23,688 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 580 GetRequests, 570 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-11-12 22:23:23,689 INFO L933 BasicCegarLoop]: 1907 mSDtfsCounter, 1830 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 1 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.53ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 1830 SdHoareTripleChecker+Valid, 1907 SdHoareTripleChecker+Invalid, 1 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 9.35ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.56ms IncrementalHoareTripleChecker+Time [2021-11-12 22:23:23,689 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1830 Valid, 1907 Invalid, 1 Unknown, 0 Unchecked, 9.35ms Time], IncrementalHoareTripleChecker [0 Valid, 1 Invalid, 0 Unknown, 0 Unchecked, 4.56ms Time] [2021-11-12 22:23:23,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1401 states. [2021-11-12 22:23:23,754 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1401 to 1401. [2021-11-12 22:23:23,758 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1401 states, 1056 states have (on average 1.3996212121212122) internal successors, (1478), 1070 states have internal predecessors, (1478), 272 states have call successors, (272), 73 states have call predecessors, (272), 72 states have return successors, (262), 260 states have call predecessors, (262), 262 states have call successors, (262) [2021-11-12 22:23:23,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1401 states to 1401 states and 2012 transitions. [2021-11-12 22:23:23,772 INFO L78 Accepts]: Start accepts. Automaton has 1401 states and 2012 transitions. Word has length 146 [2021-11-12 22:23:23,772 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:23:23,773 INFO L470 AbstractCegarLoop]: Abstraction has 1401 states and 2012 transitions. [2021-11-12 22:23:23,773 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 3 states have internal predecessors, (70), 3 states have call successors, (33), 3 states have call predecessors, (33), 2 states have return successors, (32), 2 states have call predecessors, (32), 2 states have call successors, (32) [2021-11-12 22:23:23,773 INFO L276 IsEmpty]: Start isEmpty. Operand 1401 states and 2012 transitions. [2021-11-12 22:23:23,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2021-11-12 22:23:23,775 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:23:23,775 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:23:23,816 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-11-12 22:23:23,991 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (7)] Forceful destruction successful, exit code 0 [2021-11-12 22:23:24,176 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 22:23:24,177 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:23:24,177 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:23:24,177 INFO L85 PathProgramCache]: Analyzing trace with hash -1318539753, now seen corresponding path program 1 times [2021-11-12 22:23:24,181 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:23:24,181 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1120608757] [2021-11-12 22:23:24,183 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:23:24,183 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:23:24,183 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:23:24,187 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:23:24,192 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-12 22:23:28,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:23:28,945 INFO L263 TraceCheckSpWp]: Trace formula consists of 1538 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 22:23:28,949 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:23:29,642 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 84 proven. 1 refuted. 0 times theorem prover too weak. 262 trivial. 0 not checked. [2021-11-12 22:23:29,643 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:23:30,673 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 0 proven. 71 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2021-11-12 22:23:30,673 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:23:30,673 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1120608757] [2021-11-12 22:23:30,673 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1120608757] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:23:30,674 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [104408160] [2021-11-12 22:23:30,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:23:30,674 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:23:30,674 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:23:30,677 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:23:30,678 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (9)] Waiting until timeout for monitored process [2021-11-12 22:23:32,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:23:32,595 INFO L263 TraceCheckSpWp]: Trace formula consists of 1538 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 22:23:32,599 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:23:33,639 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 347 trivial. 0 not checked. [2021-11-12 22:23:33,639 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:23:34,130 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 347 trivial. 0 not checked. [2021-11-12 22:23:34,130 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [104408160] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 22:23:34,130 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 22:23:34,131 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 3] imperfect sequences [7, 7] total 12 [2021-11-12 22:23:34,131 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1456385558] [2021-11-12 22:23:34,131 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 22:23:34,131 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 22:23:34,131 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:23:34,132 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 22:23:34,132 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-11-12 22:23:34,132 INFO L87 Difference]: Start difference. First operand 1401 states and 2012 transitions. Second operand has 3 states, 3 states have (on average 23.666666666666668) internal successors, (71), 3 states have internal predecessors, (71), 3 states have call successors, (33), 3 states have call predecessors, (33), 2 states have return successors, (32), 2 states have call predecessors, (32), 2 states have call successors, (32) [2021-11-12 22:23:34,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:23:34,206 INFO L93 Difference]: Finished difference Result 1403 states and 2013 transitions. [2021-11-12 22:23:34,207 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 22:23:34,207 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 23.666666666666668) internal successors, (71), 3 states have internal predecessors, (71), 3 states have call successors, (33), 3 states have call predecessors, (33), 2 states have return successors, (32), 2 states have call predecessors, (32), 2 states have call successors, (32) Word has length 147 [2021-11-12 22:23:34,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:23:34,219 INFO L225 Difference]: With dead ends: 1403 [2021-11-12 22:23:34,219 INFO L226 Difference]: Without dead ends: 1400 [2021-11-12 22:23:34,221 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 584 GetRequests, 574 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-11-12 22:23:34,222 INFO L933 BasicCegarLoop]: 1905 mSDtfsCounter, 1827 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 1 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.59ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 1827 SdHoareTripleChecker+Valid, 1905 SdHoareTripleChecker+Invalid, 1 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 6.72ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.61ms IncrementalHoareTripleChecker+Time [2021-11-12 22:23:34,222 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1827 Valid, 1905 Invalid, 1 Unknown, 0 Unchecked, 6.72ms Time], IncrementalHoareTripleChecker [0 Valid, 1 Invalid, 0 Unknown, 0 Unchecked, 4.61ms Time] [2021-11-12 22:23:34,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1400 states. [2021-11-12 22:23:34,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1400 to 1400. [2021-11-12 22:23:34,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1400 states, 1056 states have (on average 1.3986742424242424) internal successors, (1477), 1069 states have internal predecessors, (1477), 271 states have call successors, (271), 73 states have call predecessors, (271), 72 states have return successors, (262), 260 states have call predecessors, (262), 262 states have call successors, (262) [2021-11-12 22:23:34,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1400 states to 1400 states and 2010 transitions. [2021-11-12 22:23:34,307 INFO L78 Accepts]: Start accepts. Automaton has 1400 states and 2010 transitions. Word has length 147 [2021-11-12 22:23:34,308 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:23:34,308 INFO L470 AbstractCegarLoop]: Abstraction has 1400 states and 2010 transitions. [2021-11-12 22:23:34,308 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 23.666666666666668) internal successors, (71), 3 states have internal predecessors, (71), 3 states have call successors, (33), 3 states have call predecessors, (33), 2 states have return successors, (32), 2 states have call predecessors, (32), 2 states have call successors, (32) [2021-11-12 22:23:34,308 INFO L276 IsEmpty]: Start isEmpty. Operand 1400 states and 2010 transitions. [2021-11-12 22:23:34,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2021-11-12 22:23:34,312 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:23:34,312 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:23:34,361 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-11-12 22:23:34,542 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (9)] Ended with exit code 0 [2021-11-12 22:23:34,727 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 22:23:34,727 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:23:34,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:23:34,728 INFO L85 PathProgramCache]: Analyzing trace with hash 2073692661, now seen corresponding path program 1 times [2021-11-12 22:23:34,730 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:23:34,731 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1447738057] [2021-11-12 22:23:34,731 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:23:34,731 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:23:34,731 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:23:34,732 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:23:34,734 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-12 22:23:39,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:23:39,677 INFO L263 TraceCheckSpWp]: Trace formula consists of 1539 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 22:23:39,683 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:23:40,405 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 84 proven. 1 refuted. 0 times theorem prover too weak. 262 trivial. 0 not checked. [2021-11-12 22:23:40,406 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:23:41,452 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 0 proven. 71 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2021-11-12 22:23:41,452 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:23:41,453 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1447738057] [2021-11-12 22:23:41,453 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1447738057] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:23:41,453 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2131140139] [2021-11-12 22:23:41,453 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:23:41,453 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:23:41,453 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:23:41,454 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:23:41,459 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (11)] Waiting until timeout for monitored process [2021-11-12 22:23:43,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:23:43,538 INFO L263 TraceCheckSpWp]: Trace formula consists of 1539 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 22:23:43,544 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:23:44,805 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 347 trivial. 0 not checked. [2021-11-12 22:23:44,805 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:23:45,303 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 347 trivial. 0 not checked. [2021-11-12 22:23:45,303 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2131140139] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 22:23:45,304 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 22:23:45,304 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 3] imperfect sequences [7, 7] total 12 [2021-11-12 22:23:45,304 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2004844677] [2021-11-12 22:23:45,304 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 22:23:45,305 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 22:23:45,305 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:23:45,305 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 22:23:45,306 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-11-12 22:23:45,306 INFO L87 Difference]: Start difference. First operand 1400 states and 2010 transitions. Second operand has 3 states, 3 states have (on average 24.0) internal successors, (72), 3 states have internal predecessors, (72), 3 states have call successors, (33), 3 states have call predecessors, (33), 2 states have return successors, (32), 2 states have call predecessors, (32), 2 states have call successors, (32) [2021-11-12 22:23:45,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:23:45,402 INFO L93 Difference]: Finished difference Result 1427 states and 2035 transitions. [2021-11-12 22:23:45,402 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 22:23:45,402 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 24.0) internal successors, (72), 3 states have internal predecessors, (72), 3 states have call successors, (33), 3 states have call predecessors, (33), 2 states have return successors, (32), 2 states have call predecessors, (32), 2 states have call successors, (32) Word has length 148 [2021-11-12 22:23:45,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:23:45,415 INFO L225 Difference]: With dead ends: 1427 [2021-11-12 22:23:45,415 INFO L226 Difference]: Without dead ends: 1423 [2021-11-12 22:23:45,416 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 588 GetRequests, 578 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-11-12 22:23:45,417 INFO L933 BasicCegarLoop]: 1911 mSDtfsCounter, 179 mSDsluCounter, 1667 mSDsCounter, 0 mSdLazyCounter, 5 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 19.76ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 179 SdHoareTripleChecker+Valid, 3578 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 8.48ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 5 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 24.53ms IncrementalHoareTripleChecker+Time [2021-11-12 22:23:45,418 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [179 Valid, 3578 Invalid, 7 Unknown, 0 Unchecked, 8.48ms Time], IncrementalHoareTripleChecker [2 Valid, 5 Invalid, 0 Unknown, 0 Unchecked, 24.53ms Time] [2021-11-12 22:23:45,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1423 states. [2021-11-12 22:23:45,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1423 to 1421. [2021-11-12 22:23:45,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1421 states, 1070 states have (on average 1.3925233644859814) internal successors, (1490), 1081 states have internal predecessors, (1490), 273 states have call successors, (273), 78 states have call predecessors, (273), 77 states have return successors, (266), 264 states have call predecessors, (266), 266 states have call successors, (266) [2021-11-12 22:23:45,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1421 states to 1421 states and 2029 transitions. [2021-11-12 22:23:45,497 INFO L78 Accepts]: Start accepts. Automaton has 1421 states and 2029 transitions. Word has length 148 [2021-11-12 22:23:45,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:23:45,498 INFO L470 AbstractCegarLoop]: Abstraction has 1421 states and 2029 transitions. [2021-11-12 22:23:45,498 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 24.0) internal successors, (72), 3 states have internal predecessors, (72), 3 states have call successors, (33), 3 states have call predecessors, (33), 2 states have return successors, (32), 2 states have call predecessors, (32), 2 states have call successors, (32) [2021-11-12 22:23:45,499 INFO L276 IsEmpty]: Start isEmpty. Operand 1421 states and 2029 transitions. [2021-11-12 22:23:45,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2021-11-12 22:23:45,501 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:23:45,501 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:23:45,523 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (11)] Forceful destruction successful, exit code 0 [2021-11-12 22:23:45,747 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-12 22:23:45,917 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 22:23:45,917 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:23:45,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:23:45,917 INFO L85 PathProgramCache]: Analyzing trace with hash -141280038, now seen corresponding path program 1 times [2021-11-12 22:23:45,920 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:23:45,920 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2114508902] [2021-11-12 22:23:45,920 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:23:45,921 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:23:45,921 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:23:45,922 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:23:45,923 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-12 22:23:50,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:23:50,846 INFO L263 TraceCheckSpWp]: Trace formula consists of 1540 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 22:23:50,850 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:23:51,562 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 84 proven. 1 refuted. 0 times theorem prover too weak. 262 trivial. 0 not checked. [2021-11-12 22:23:51,562 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:23:52,708 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 0 proven. 71 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2021-11-12 22:23:52,709 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:23:52,709 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2114508902] [2021-11-12 22:23:52,709 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2114508902] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:23:52,709 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [425945727] [2021-11-12 22:23:52,709 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:23:52,709 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:23:52,709 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:23:52,710 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:23:52,711 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (13)] Waiting until timeout for monitored process [2021-11-12 22:23:54,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:23:54,907 INFO L263 TraceCheckSpWp]: Trace formula consists of 1540 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 22:23:54,912 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:23:56,256 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 347 trivial. 0 not checked. [2021-11-12 22:23:56,256 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:23:56,790 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 347 trivial. 0 not checked. [2021-11-12 22:23:56,790 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [425945727] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 22:23:56,790 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 22:23:56,791 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 3] imperfect sequences [7, 7] total 12 [2021-11-12 22:23:56,791 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1248329007] [2021-11-12 22:23:56,791 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 22:23:56,792 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 22:23:56,792 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:23:56,793 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 22:23:56,793 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-11-12 22:23:56,793 INFO L87 Difference]: Start difference. First operand 1421 states and 2029 transitions. Second operand has 3 states, 3 states have (on average 24.333333333333332) internal successors, (73), 3 states have internal predecessors, (73), 3 states have call successors, (33), 3 states have call predecessors, (33), 2 states have return successors, (32), 2 states have call predecessors, (32), 2 states have call successors, (32) [2021-11-12 22:23:57,008 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:23:57,009 INFO L93 Difference]: Finished difference Result 4043 states and 5820 transitions. [2021-11-12 22:23:57,009 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 22:23:57,009 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 24.333333333333332) internal successors, (73), 3 states have internal predecessors, (73), 3 states have call successors, (33), 3 states have call predecessors, (33), 2 states have return successors, (32), 2 states have call predecessors, (32), 2 states have call successors, (32) Word has length 149 [2021-11-12 22:23:57,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:23:57,033 INFO L225 Difference]: With dead ends: 4043 [2021-11-12 22:23:57,033 INFO L226 Difference]: Without dead ends: 2663 [2021-11-12 22:23:57,042 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 592 GetRequests, 582 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-11-12 22:23:57,043 INFO L933 BasicCegarLoop]: 2740 mSDtfsCounter, 1688 mSDsluCounter, 1803 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 57.19ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 1688 SdHoareTripleChecker+Valid, 4543 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 12.83ms SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 63.11ms IncrementalHoareTripleChecker+Time [2021-11-12 22:23:57,044 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1688 Valid, 4543 Invalid, 23 Unknown, 0 Unchecked, 12.83ms Time], IncrementalHoareTripleChecker [9 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 63.11ms Time] [2021-11-12 22:23:57,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2663 states. [2021-11-12 22:23:57,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2663 to 2659. [2021-11-12 22:23:57,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2659 states, 2023 states have (on average 1.3964409293129016) internal successors, (2825), 2045 states have internal predecessors, (2825), 494 states have call successors, (494), 145 states have call predecessors, (494), 141 states have return successors, (502), 472 states have call predecessors, (502), 481 states have call successors, (502) [2021-11-12 22:23:57,213 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2659 states to 2659 states and 3821 transitions. [2021-11-12 22:23:57,214 INFO L78 Accepts]: Start accepts. Automaton has 2659 states and 3821 transitions. Word has length 149 [2021-11-12 22:23:57,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:23:57,215 INFO L470 AbstractCegarLoop]: Abstraction has 2659 states and 3821 transitions. [2021-11-12 22:23:57,215 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 24.333333333333332) internal successors, (73), 3 states have internal predecessors, (73), 3 states have call successors, (33), 3 states have call predecessors, (33), 2 states have return successors, (32), 2 states have call predecessors, (32), 2 states have call successors, (32) [2021-11-12 22:23:57,215 INFO L276 IsEmpty]: Start isEmpty. Operand 2659 states and 3821 transitions. [2021-11-12 22:23:57,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2021-11-12 22:23:57,218 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:23:57,218 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:23:57,263 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-11-12 22:23:57,450 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (13)] Forceful destruction successful, exit code 0 [2021-11-12 22:23:57,631 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 22:23:57,631 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:23:57,632 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:23:57,632 INFO L85 PathProgramCache]: Analyzing trace with hash -85952104, now seen corresponding path program 1 times [2021-11-12 22:23:57,635 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:23:57,636 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1041011024] [2021-11-12 22:23:57,636 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:23:57,636 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:23:57,636 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:23:57,637 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:23:57,644 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-11-12 22:24:02,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:24:02,613 INFO L263 TraceCheckSpWp]: Trace formula consists of 1541 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 22:24:02,616 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:24:03,330 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 84 proven. 1 refuted. 0 times theorem prover too weak. 262 trivial. 0 not checked. [2021-11-12 22:24:03,330 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:24:04,630 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 0 proven. 71 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2021-11-12 22:24:04,630 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:24:04,631 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1041011024] [2021-11-12 22:24:04,631 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1041011024] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:24:04,631 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [245023704] [2021-11-12 22:24:04,631 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:24:04,631 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:24:04,631 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:24:04,633 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:24:04,651 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (15)] Waiting until timeout for monitored process [2021-11-12 22:24:06,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:24:06,654 INFO L263 TraceCheckSpWp]: Trace formula consists of 1541 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 22:24:06,658 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:24:07,869 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 347 trivial. 0 not checked. [2021-11-12 22:24:07,870 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:24:08,398 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 347 trivial. 0 not checked. [2021-11-12 22:24:08,398 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [245023704] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 22:24:08,398 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 22:24:08,399 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 3] imperfect sequences [7, 7] total 12 [2021-11-12 22:24:08,399 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [187796588] [2021-11-12 22:24:08,399 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 22:24:08,400 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 22:24:08,400 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:24:08,400 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 22:24:08,401 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-11-12 22:24:08,401 INFO L87 Difference]: Start difference. First operand 2659 states and 3821 transitions. Second operand has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 3 states have call successors, (33), 3 states have call predecessors, (33), 2 states have return successors, (32), 2 states have call predecessors, (32), 2 states have call successors, (32) [2021-11-12 22:24:08,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:24:08,509 INFO L93 Difference]: Finished difference Result 2661 states and 3822 transitions. [2021-11-12 22:24:08,509 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 22:24:08,510 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 3 states have call successors, (33), 3 states have call predecessors, (33), 2 states have return successors, (32), 2 states have call predecessors, (32), 2 states have call successors, (32) Word has length 150 [2021-11-12 22:24:08,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:24:08,529 INFO L225 Difference]: With dead ends: 2661 [2021-11-12 22:24:08,529 INFO L226 Difference]: Without dead ends: 2636 [2021-11-12 22:24:08,532 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 596 GetRequests, 586 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-11-12 22:24:08,532 INFO L933 BasicCegarLoop]: 1900 mSDtfsCounter, 1818 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.00ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 1818 SdHoareTripleChecker+Valid, 1900 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 6.17ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.00ms IncrementalHoareTripleChecker+Time [2021-11-12 22:24:08,533 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1818 Valid, 1900 Invalid, 0 Unknown, 0 Unchecked, 6.17ms Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.00ms Time] [2021-11-12 22:24:08,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2636 states. [2021-11-12 22:24:08,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2636 to 2636. [2021-11-12 22:24:08,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2636 states, 2008 states have (on average 1.3969123505976095) internal successors, (2805), 2028 states have internal predecessors, (2805), 488 states have call successors, (488), 143 states have call predecessors, (488), 139 states have return successors, (497), 468 states have call predecessors, (497), 476 states have call successors, (497) [2021-11-12 22:24:08,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2636 states to 2636 states and 3790 transitions. [2021-11-12 22:24:08,700 INFO L78 Accepts]: Start accepts. Automaton has 2636 states and 3790 transitions. Word has length 150 [2021-11-12 22:24:08,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:24:08,705 INFO L470 AbstractCegarLoop]: Abstraction has 2636 states and 3790 transitions. [2021-11-12 22:24:08,706 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 3 states have call successors, (33), 3 states have call predecessors, (33), 2 states have return successors, (32), 2 states have call predecessors, (32), 2 states have call successors, (32) [2021-11-12 22:24:08,706 INFO L276 IsEmpty]: Start isEmpty. Operand 2636 states and 3790 transitions. [2021-11-12 22:24:08,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2021-11-12 22:24:08,710 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:24:08,710 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:24:08,729 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (15)] Forceful destruction successful, exit code 0 [2021-11-12 22:24:08,964 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2021-11-12 22:24:09,127 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 22:24:09,127 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:24:09,127 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:24:09,128 INFO L85 PathProgramCache]: Analyzing trace with hash -1473036931, now seen corresponding path program 1 times [2021-11-12 22:24:09,134 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:24:09,134 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1110011132] [2021-11-12 22:24:09,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:24:09,135 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:24:09,135 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:24:09,136 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:24:09,171 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-11-12 22:24:14,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:24:14,186 INFO L263 TraceCheckSpWp]: Trace formula consists of 1695 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 22:24:14,190 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:24:15,114 INFO L134 CoverageAnalysis]: Checked inductivity of 389 backedges. 112 proven. 1 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2021-11-12 22:24:15,114 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:24:16,393 INFO L134 CoverageAnalysis]: Checked inductivity of 389 backedges. 0 proven. 71 refuted. 0 times theorem prover too weak. 318 trivial. 0 not checked. [2021-11-12 22:24:16,394 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:24:16,394 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1110011132] [2021-11-12 22:24:16,394 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1110011132] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:24:16,394 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1000840182] [2021-11-12 22:24:16,394 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:24:16,395 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:24:16,395 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:24:16,408 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:24:16,435 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (17)] Waiting until timeout for monitored process [2021-11-12 22:24:18,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:24:18,472 INFO L263 TraceCheckSpWp]: Trace formula consists of 1695 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 22:24:18,476 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:24:18,906 INFO L134 CoverageAnalysis]: Checked inductivity of 389 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 386 trivial. 0 not checked. [2021-11-12 22:24:18,906 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:24:19,329 INFO L134 CoverageAnalysis]: Checked inductivity of 389 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 386 trivial. 0 not checked. [2021-11-12 22:24:19,329 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1000840182] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 22:24:19,329 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 22:24:19,329 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [7, 7] total 12 [2021-11-12 22:24:19,330 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [536279092] [2021-11-12 22:24:19,330 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 22:24:19,330 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 22:24:19,330 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:24:19,331 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 22:24:19,331 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-11-12 22:24:19,331 INFO L87 Difference]: Start difference. First operand 2636 states and 3790 transitions. Second operand has 3 states, 3 states have (on average 25.0) internal successors, (75), 3 states have internal predecessors, (75), 2 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (19), 2 states have call predecessors, (19), 2 states have call successors, (19) [2021-11-12 22:24:21,559 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.23s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 22:24:21,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:24:21,822 INFO L93 Difference]: Finished difference Result 5243 states and 7543 transitions. [2021-11-12 22:24:21,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 22:24:21,823 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 25.0) internal successors, (75), 3 states have internal predecessors, (75), 2 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (19), 2 states have call predecessors, (19), 2 states have call successors, (19) Word has length 195 [2021-11-12 22:24:21,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:24:21,848 INFO L225 Difference]: With dead ends: 5243 [2021-11-12 22:24:21,848 INFO L226 Difference]: Without dead ends: 2646 [2021-11-12 22:24:21,867 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 776 GetRequests, 766 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-11-12 22:24:21,870 INFO L933 BasicCegarLoop]: 1905 mSDtfsCounter, 8 mSDsluCounter, 1893 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 1 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2239.62ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 3798 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 8.84ms SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2319.81ms IncrementalHoareTripleChecker+Time [2021-11-12 22:24:21,871 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 3798 Invalid, 6 Unknown, 0 Unchecked, 8.84ms Time], IncrementalHoareTripleChecker [1 Valid, 4 Invalid, 1 Unknown, 0 Unchecked, 2319.81ms Time] [2021-11-12 22:24:21,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2646 states. [2021-11-12 22:24:22,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2646 to 2637. [2021-11-12 22:24:22,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2637 states, 2009 states have (on average 1.3957192633150821) internal successors, (2804), 2029 states have internal predecessors, (2804), 488 states have call successors, (488), 143 states have call predecessors, (488), 139 states have return successors, (497), 468 states have call predecessors, (497), 476 states have call successors, (497) [2021-11-12 22:24:22,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2637 states to 2637 states and 3789 transitions. [2021-11-12 22:24:22,058 INFO L78 Accepts]: Start accepts. Automaton has 2637 states and 3789 transitions. Word has length 195 [2021-11-12 22:24:22,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:24:22,059 INFO L470 AbstractCegarLoop]: Abstraction has 2637 states and 3789 transitions. [2021-11-12 22:24:22,059 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 25.0) internal successors, (75), 3 states have internal predecessors, (75), 2 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (19), 2 states have call predecessors, (19), 2 states have call successors, (19) [2021-11-12 22:24:22,059 INFO L276 IsEmpty]: Start isEmpty. Operand 2637 states and 3789 transitions. [2021-11-12 22:24:22,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 204 [2021-11-12 22:24:22,065 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:24:22,066 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:24:22,118 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2021-11-12 22:24:22,296 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (17)] Forceful destruction successful, exit code 0 [2021-11-12 22:24:22,480 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 22:24:22,481 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:24:22,481 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:24:22,481 INFO L85 PathProgramCache]: Analyzing trace with hash -263493960, now seen corresponding path program 1 times [2021-11-12 22:24:22,485 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:24:22,485 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [884022338] [2021-11-12 22:24:22,485 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:24:22,485 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:24:22,486 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:24:22,487 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:24:22,500 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-11-12 22:24:27,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:24:27,833 INFO L263 TraceCheckSpWp]: Trace formula consists of 1714 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 22:24:27,840 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:24:28,818 INFO L134 CoverageAnalysis]: Checked inductivity of 389 backedges. 112 proven. 1 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2021-11-12 22:24:28,819 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:24:30,042 INFO L134 CoverageAnalysis]: Checked inductivity of 389 backedges. 0 proven. 71 refuted. 0 times theorem prover too weak. 318 trivial. 0 not checked. [2021-11-12 22:24:30,042 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:24:30,042 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [884022338] [2021-11-12 22:24:30,042 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [884022338] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:24:30,043 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2132443505] [2021-11-12 22:24:30,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:24:30,043 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:24:30,043 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:24:30,052 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:24:30,065 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (19)] Waiting until timeout for monitored process [2021-11-12 22:24:32,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:24:32,244 INFO L263 TraceCheckSpWp]: Trace formula consists of 1714 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 22:24:32,254 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:24:32,995 INFO L134 CoverageAnalysis]: Checked inductivity of 389 backedges. 31 proven. 0 refuted. 0 times theorem prover too weak. 358 trivial. 0 not checked. [2021-11-12 22:24:32,996 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:24:33,640 INFO L134 CoverageAnalysis]: Checked inductivity of 389 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 386 trivial. 0 not checked. [2021-11-12 22:24:33,640 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2132443505] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 22:24:33,640 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 22:24:33,641 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [7, 7] total 12 [2021-11-12 22:24:33,641 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1456501855] [2021-11-12 22:24:33,641 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 22:24:33,642 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 22:24:33,642 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:24:33,642 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 22:24:33,643 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-11-12 22:24:33,643 INFO L87 Difference]: Start difference. First operand 2637 states and 3789 transitions. Second operand has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 3 states have internal predecessors, (95), 3 states have call successors, (29), 3 states have call predecessors, (29), 3 states have return successors, (26), 3 states have call predecessors, (26), 3 states have call successors, (26) [2021-11-12 22:24:35,995 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.35s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 22:24:36,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:24:36,522 INFO L93 Difference]: Finished difference Result 5404 states and 7755 transitions. [2021-11-12 22:24:36,523 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 22:24:36,523 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 3 states have internal predecessors, (95), 3 states have call successors, (29), 3 states have call predecessors, (29), 3 states have return successors, (26), 3 states have call predecessors, (26), 3 states have call successors, (26) Word has length 203 [2021-11-12 22:24:36,524 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:24:36,549 INFO L225 Difference]: With dead ends: 5404 [2021-11-12 22:24:36,549 INFO L226 Difference]: Without dead ends: 2808 [2021-11-12 22:24:36,566 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 808 GetRequests, 798 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-11-12 22:24:36,567 INFO L933 BasicCegarLoop]: 1983 mSDtfsCounter, 148 mSDsluCounter, 1835 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 11 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2597.34ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 148 SdHoareTripleChecker+Valid, 3818 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 8.73ms SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2707.19ms IncrementalHoareTripleChecker+Time [2021-11-12 22:24:36,568 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [148 Valid, 3818 Invalid, 44 Unknown, 0 Unchecked, 8.73ms Time], IncrementalHoareTripleChecker [11 Valid, 32 Invalid, 1 Unknown, 0 Unchecked, 2707.19ms Time] [2021-11-12 22:24:36,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2808 states. [2021-11-12 22:24:36,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2808 to 2789. [2021-11-12 22:24:36,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2789 states, 2139 states have (on average 1.39177185600748) internal successors, (2977), 2159 states have internal predecessors, (2977), 498 states have call successors, (498), 155 states have call predecessors, (498), 151 states have return successors, (507), 478 states have call predecessors, (507), 486 states have call successors, (507) [2021-11-12 22:24:36,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2789 states to 2789 states and 3982 transitions. [2021-11-12 22:24:36,784 INFO L78 Accepts]: Start accepts. Automaton has 2789 states and 3982 transitions. Word has length 203 [2021-11-12 22:24:36,784 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:24:36,785 INFO L470 AbstractCegarLoop]: Abstraction has 2789 states and 3982 transitions. [2021-11-12 22:24:36,786 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 3 states have internal predecessors, (95), 3 states have call successors, (29), 3 states have call predecessors, (29), 3 states have return successors, (26), 3 states have call predecessors, (26), 3 states have call successors, (26) [2021-11-12 22:24:36,786 INFO L276 IsEmpty]: Start isEmpty. Operand 2789 states and 3982 transitions. [2021-11-12 22:24:36,790 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 203 [2021-11-12 22:24:36,791 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:24:36,791 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:24:36,809 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (19)] Forceful destruction successful, exit code 0 [2021-11-12 22:24:37,060 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (18)] Forceful destruction successful, exit code 0 [2021-11-12 22:24:37,209 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 22:24:37,209 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:24:37,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:24:37,210 INFO L85 PathProgramCache]: Analyzing trace with hash 311809544, now seen corresponding path program 1 times [2021-11-12 22:24:37,213 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:24:37,214 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [35874442] [2021-11-12 22:24:37,214 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:24:37,214 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:24:37,214 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:24:37,216 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:24:37,261 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-11-12 22:24:42,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:24:42,289 INFO L263 TraceCheckSpWp]: Trace formula consists of 1713 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 22:24:42,293 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:24:43,204 INFO L134 CoverageAnalysis]: Checked inductivity of 389 backedges. 112 proven. 1 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2021-11-12 22:24:43,204 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:24:44,364 INFO L134 CoverageAnalysis]: Checked inductivity of 389 backedges. 0 proven. 71 refuted. 0 times theorem prover too weak. 318 trivial. 0 not checked. [2021-11-12 22:24:44,364 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:24:44,365 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [35874442] [2021-11-12 22:24:44,365 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [35874442] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:24:44,365 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [380420874] [2021-11-12 22:24:44,365 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:24:44,365 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:24:44,365 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:24:44,366 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:24:44,369 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (21)] Waiting until timeout for monitored process [2021-11-12 22:24:46,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:24:46,519 INFO L263 TraceCheckSpWp]: Trace formula consists of 1713 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-12 22:24:46,522 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:24:47,087 INFO L134 CoverageAnalysis]: Checked inductivity of 389 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 389 trivial. 0 not checked. [2021-11-12 22:24:47,087 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:24:47,507 INFO L134 CoverageAnalysis]: Checked inductivity of 389 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 389 trivial. 0 not checked. [2021-11-12 22:24:47,507 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [380420874] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 22:24:47,507 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 22:24:47,508 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [7, 7] total 12 [2021-11-12 22:24:47,508 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1199429188] [2021-11-12 22:24:47,508 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 22:24:47,509 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 22:24:47,509 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:24:47,509 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 22:24:47,509 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-11-12 22:24:47,509 INFO L87 Difference]: Start difference. First operand 2789 states and 3982 transitions. Second operand has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 3 states have call successors, (22), 3 states have call predecessors, (22), 2 states have return successors, (19), 2 states have call predecessors, (19), 2 states have call successors, (19) [2021-11-12 22:24:49,710 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.20s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 22:24:49,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:24:49,891 INFO L93 Difference]: Finished difference Result 2793 states and 3984 transitions. [2021-11-12 22:24:49,892 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 22:24:49,892 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 3 states have call successors, (22), 3 states have call predecessors, (22), 2 states have return successors, (19), 2 states have call predecessors, (19), 2 states have call successors, (19) Word has length 202 [2021-11-12 22:24:49,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:24:49,914 INFO L225 Difference]: With dead ends: 2793 [2021-11-12 22:24:49,914 INFO L226 Difference]: Without dead ends: 2790 [2021-11-12 22:24:49,916 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 804 GetRequests, 794 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-11-12 22:24:49,917 INFO L933 BasicCegarLoop]: 1914 mSDtfsCounter, 1656 mSDsluCounter, 253 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 0 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2207.63ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 1656 SdHoareTripleChecker+Valid, 2167 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 5.79ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2271.71ms IncrementalHoareTripleChecker+Time [2021-11-12 22:24:49,918 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1656 Valid, 2167 Invalid, 5 Unknown, 0 Unchecked, 5.79ms Time], IncrementalHoareTripleChecker [0 Valid, 4 Invalid, 1 Unknown, 0 Unchecked, 2271.71ms Time] [2021-11-12 22:24:49,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2790 states. [2021-11-12 22:24:50,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2790 to 2788. [2021-11-12 22:24:50,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2788 states, 2139 states have (on average 1.3899018232819074) internal successors, (2973), 2158 states have internal predecessors, (2973), 497 states have call successors, (497), 155 states have call predecessors, (497), 151 states have return successors, (507), 478 states have call predecessors, (507), 486 states have call successors, (507) [2021-11-12 22:24:50,095 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2788 states to 2788 states and 3977 transitions. [2021-11-12 22:24:50,096 INFO L78 Accepts]: Start accepts. Automaton has 2788 states and 3977 transitions. Word has length 202 [2021-11-12 22:24:50,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:24:50,097 INFO L470 AbstractCegarLoop]: Abstraction has 2788 states and 3977 transitions. [2021-11-12 22:24:50,097 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 3 states have call successors, (22), 3 states have call predecessors, (22), 2 states have return successors, (19), 2 states have call predecessors, (19), 2 states have call successors, (19) [2021-11-12 22:24:50,097 INFO L276 IsEmpty]: Start isEmpty. Operand 2788 states and 3977 transitions. [2021-11-12 22:24:50,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 292 [2021-11-12 22:24:50,107 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:24:50,107 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:24:50,129 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (21)] Forceful destruction successful, exit code 0 [2021-11-12 22:24:50,358 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (20)] Forceful destruction successful, exit code 0 [2021-11-12 22:24:50,525 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 22:24:50,525 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:24:50,525 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:24:50,526 INFO L85 PathProgramCache]: Analyzing trace with hash -1740849093, now seen corresponding path program 1 times [2021-11-12 22:24:50,529 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:24:50,529 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1607405179] [2021-11-12 22:24:50,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:24:50,530 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:24:50,530 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:24:50,531 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:24:50,536 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (22)] Waiting until timeout for monitored process [2021-11-12 22:24:55,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:24:55,765 INFO L263 TraceCheckSpWp]: Trace formula consists of 1902 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 22:24:55,769 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:24:57,095 INFO L134 CoverageAnalysis]: Checked inductivity of 398 backedges. 112 proven. 1 refuted. 0 times theorem prover too weak. 285 trivial. 0 not checked. [2021-11-12 22:24:57,095 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:24:58,660 INFO L134 CoverageAnalysis]: Checked inductivity of 398 backedges. 0 proven. 71 refuted. 0 times theorem prover too weak. 327 trivial. 0 not checked. [2021-11-12 22:24:58,660 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:24:58,660 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1607405179] [2021-11-12 22:24:58,661 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1607405179] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:24:58,661 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [857850589] [2021-11-12 22:24:58,661 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:24:58,662 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:24:58,662 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:24:58,666 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:24:58,667 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (23)] Waiting until timeout for monitored process [2021-11-12 22:25:00,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:25:00,697 INFO L263 TraceCheckSpWp]: Trace formula consists of 1902 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-12 22:25:00,702 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:25:01,573 INFO L134 CoverageAnalysis]: Checked inductivity of 398 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 398 trivial. 0 not checked. [2021-11-12 22:25:01,573 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:25:02,589 INFO L134 CoverageAnalysis]: Checked inductivity of 398 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 398 trivial. 0 not checked. [2021-11-12 22:25:02,589 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [857850589] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 22:25:02,589 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 22:25:02,590 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 5] imperfect sequences [7, 7] total 14 [2021-11-12 22:25:02,590 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1117865595] [2021-11-12 22:25:02,590 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 22:25:02,590 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-12 22:25:02,591 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:25:02,591 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-12 22:25:02,591 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-11-12 22:25:02,591 INFO L87 Difference]: Start difference. First operand 2788 states and 3977 transitions. Second operand has 5 states, 5 states have (on average 34.8) internal successors, (174), 5 states have internal predecessors, (174), 2 states have call successors, (33), 2 states have call predecessors, (33), 2 states have return successors, (30), 2 states have call predecessors, (30), 2 states have call successors, (30) [2021-11-12 22:25:03,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:25:03,298 INFO L93 Difference]: Finished difference Result 5946 states and 8517 transitions. [2021-11-12 22:25:03,299 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 22:25:03,299 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 34.8) internal successors, (174), 5 states have internal predecessors, (174), 2 states have call successors, (33), 2 states have call predecessors, (33), 2 states have return successors, (30), 2 states have call predecessors, (30), 2 states have call successors, (30) Word has length 291 [2021-11-12 22:25:03,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:25:03,347 INFO L225 Difference]: With dead ends: 5946 [2021-11-12 22:25:03,347 INFO L226 Difference]: Without dead ends: 3199 [2021-11-12 22:25:03,362 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1160 GetRequests, 1148 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-11-12 22:25:03,364 INFO L933 BasicCegarLoop]: 2016 mSDtfsCounter, 509 mSDsluCounter, 1817 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 148 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 337.91ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 545 SdHoareTripleChecker+Valid, 3833 SdHoareTripleChecker+Invalid, 194 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 18.60ms SdHoareTripleChecker+Time, 148 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 423.98ms IncrementalHoareTripleChecker+Time [2021-11-12 22:25:03,364 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [545 Valid, 3833 Invalid, 194 Unknown, 0 Unchecked, 18.60ms Time], IncrementalHoareTripleChecker [148 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 423.98ms Time] [2021-11-12 22:25:03,370 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3199 states. [2021-11-12 22:25:03,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3199 to 2826. [2021-11-12 22:25:03,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2826 states, 2177 states have (on average 1.3821773082223243) internal successors, (3009), 2196 states have internal predecessors, (3009), 497 states have call successors, (497), 155 states have call predecessors, (497), 151 states have return successors, (507), 478 states have call predecessors, (507), 486 states have call successors, (507) [2021-11-12 22:25:03,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2826 states to 2826 states and 4013 transitions. [2021-11-12 22:25:03,563 INFO L78 Accepts]: Start accepts. Automaton has 2826 states and 4013 transitions. Word has length 291 [2021-11-12 22:25:03,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:25:03,564 INFO L470 AbstractCegarLoop]: Abstraction has 2826 states and 4013 transitions. [2021-11-12 22:25:03,564 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 34.8) internal successors, (174), 5 states have internal predecessors, (174), 2 states have call successors, (33), 2 states have call predecessors, (33), 2 states have return successors, (30), 2 states have call predecessors, (30), 2 states have call successors, (30) [2021-11-12 22:25:03,564 INFO L276 IsEmpty]: Start isEmpty. Operand 2826 states and 4013 transitions. [2021-11-12 22:25:03,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 274 [2021-11-12 22:25:03,573 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:25:03,573 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:25:03,629 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (22)] Forceful destruction successful, exit code 0 [2021-11-12 22:25:03,801 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (23)] Ended with exit code 0 [2021-11-12 22:25:03,987 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 22:25:03,987 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:25:03,988 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:25:03,988 INFO L85 PathProgramCache]: Analyzing trace with hash 687778719, now seen corresponding path program 1 times [2021-11-12 22:25:03,991 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:25:03,991 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1456074068] [2021-11-12 22:25:03,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:25:03,991 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:25:03,992 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:25:03,992 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:25:03,993 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (24)] Waiting until timeout for monitored process [2021-11-12 22:25:09,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:25:09,365 INFO L263 TraceCheckSpWp]: Trace formula consists of 1887 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 22:25:09,369 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:25:10,673 INFO L134 CoverageAnalysis]: Checked inductivity of 401 backedges. 112 proven. 1 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2021-11-12 22:25:10,673 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:25:12,236 INFO L134 CoverageAnalysis]: Checked inductivity of 401 backedges. 0 proven. 71 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2021-11-12 22:25:12,236 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:25:12,237 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1456074068] [2021-11-12 22:25:12,237 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1456074068] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:25:12,237 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1125145513] [2021-11-12 22:25:12,237 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:25:12,237 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:25:12,238 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:25:12,239 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:25:12,244 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (25)] Waiting until timeout for monitored process [2021-11-12 22:25:14,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:25:14,494 INFO L263 TraceCheckSpWp]: Trace formula consists of 1887 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 22:25:14,499 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:25:15,091 INFO L134 CoverageAnalysis]: Checked inductivity of 401 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 401 trivial. 0 not checked. [2021-11-12 22:25:15,091 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:25:15,701 INFO L134 CoverageAnalysis]: Checked inductivity of 401 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 401 trivial. 0 not checked. [2021-11-12 22:25:15,701 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1125145513] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 22:25:15,702 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 22:25:15,702 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [7, 7] total 12 [2021-11-12 22:25:15,702 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1078533519] [2021-11-12 22:25:15,703 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 22:25:15,704 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 22:25:15,704 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:25:15,704 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 22:25:15,705 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-11-12 22:25:15,705 INFO L87 Difference]: Start difference. First operand 2826 states and 4013 transitions. Second operand has 3 states, 3 states have (on average 45.333333333333336) internal successors, (136), 3 states have internal predecessors, (136), 2 states have call successors, (29), 2 states have call predecessors, (29), 2 states have return successors, (26), 2 states have call predecessors, (26), 2 states have call successors, (26) [2021-11-12 22:25:15,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:25:15,899 INFO L93 Difference]: Finished difference Result 5613 states and 7988 transitions. [2021-11-12 22:25:15,901 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 22:25:15,901 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 45.333333333333336) internal successors, (136), 3 states have internal predecessors, (136), 2 states have call successors, (29), 2 states have call predecessors, (29), 2 states have return successors, (26), 2 states have call predecessors, (26), 2 states have call successors, (26) Word has length 273 [2021-11-12 22:25:15,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:25:15,933 INFO L225 Difference]: With dead ends: 5613 [2021-11-12 22:25:15,934 INFO L226 Difference]: Without dead ends: 2828 [2021-11-12 22:25:15,955 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1088 GetRequests, 1078 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-11-12 22:25:15,956 INFO L933 BasicCegarLoop]: 1894 mSDtfsCounter, 0 mSDsluCounter, 1890 mSDsCounter, 0 mSdLazyCounter, 5 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 29.56ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 3784 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 8.26ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 5 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 31.40ms IncrementalHoareTripleChecker+Time [2021-11-12 22:25:15,957 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 3784 Invalid, 5 Unknown, 0 Unchecked, 8.26ms Time], IncrementalHoareTripleChecker [0 Valid, 5 Invalid, 0 Unknown, 0 Unchecked, 31.40ms Time] [2021-11-12 22:25:15,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2828 states. [2021-11-12 22:25:16,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2828 to 2828. [2021-11-12 22:25:16,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2828 states, 2179 states have (on average 1.3818265259293254) internal successors, (3011), 2198 states have internal predecessors, (3011), 497 states have call successors, (497), 155 states have call predecessors, (497), 151 states have return successors, (507), 478 states have call predecessors, (507), 486 states have call successors, (507) [2021-11-12 22:25:16,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2828 states to 2828 states and 4015 transitions. [2021-11-12 22:25:16,252 INFO L78 Accepts]: Start accepts. Automaton has 2828 states and 4015 transitions. Word has length 273 [2021-11-12 22:25:16,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:25:16,254 INFO L470 AbstractCegarLoop]: Abstraction has 2828 states and 4015 transitions. [2021-11-12 22:25:16,255 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 45.333333333333336) internal successors, (136), 3 states have internal predecessors, (136), 2 states have call successors, (29), 2 states have call predecessors, (29), 2 states have return successors, (26), 2 states have call predecessors, (26), 2 states have call successors, (26) [2021-11-12 22:25:16,255 INFO L276 IsEmpty]: Start isEmpty. Operand 2828 states and 4015 transitions. [2021-11-12 22:25:16,263 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 274 [2021-11-12 22:25:16,263 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:25:16,264 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:25:16,282 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (25)] Forceful destruction successful, exit code 0 [2021-11-12 22:25:16,540 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (24)] Forceful destruction successful, exit code 0 [2021-11-12 22:25:16,682 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 22:25:16,682 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:25:16,682 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:25:16,683 INFO L85 PathProgramCache]: Analyzing trace with hash -684028579, now seen corresponding path program 1 times [2021-11-12 22:25:16,686 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:25:16,686 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1338027066] [2021-11-12 22:25:16,686 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:25:16,686 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:25:16,687 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:25:16,687 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:25:16,690 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (26)] Waiting until timeout for monitored process [2021-11-12 22:25:21,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:25:22,104 INFO L263 TraceCheckSpWp]: Trace formula consists of 1890 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 22:25:22,108 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:25:23,288 INFO L134 CoverageAnalysis]: Checked inductivity of 401 backedges. 112 proven. 1 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2021-11-12 22:25:23,288 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:25:24,734 INFO L134 CoverageAnalysis]: Checked inductivity of 401 backedges. 0 proven. 71 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2021-11-12 22:25:24,734 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:25:24,734 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1338027066] [2021-11-12 22:25:24,734 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1338027066] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:25:24,735 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [634563572] [2021-11-12 22:25:24,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:25:24,735 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:25:24,735 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:25:24,736 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:25:24,737 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (27)] Waiting until timeout for monitored process [2021-11-12 22:25:26,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:25:26,869 INFO L263 TraceCheckSpWp]: Trace formula consists of 1890 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-12 22:25:26,874 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:25:27,609 INFO L134 CoverageAnalysis]: Checked inductivity of 401 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 401 trivial. 0 not checked. [2021-11-12 22:25:27,609 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:25:28,156 INFO L134 CoverageAnalysis]: Checked inductivity of 401 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 401 trivial. 0 not checked. [2021-11-12 22:25:28,157 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [634563572] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 22:25:28,157 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 22:25:28,157 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [7, 7] total 14 [2021-11-12 22:25:28,157 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [275624751] [2021-11-12 22:25:28,157 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 22:25:28,158 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-12 22:25:28,158 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:25:28,159 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-12 22:25:28,159 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=148, Unknown=0, NotChecked=0, Total=182 [2021-11-12 22:25:28,159 INFO L87 Difference]: Start difference. First operand 2828 states and 4015 transitions. Second operand has 5 states, 5 states have (on average 24.6) internal successors, (123), 5 states have internal predecessors, (123), 2 states have call successors, (27), 2 states have call predecessors, (27), 2 states have return successors, (24), 2 states have call predecessors, (24), 1 states have call successors, (24) [2021-11-12 22:25:28,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:25:28,521 INFO L93 Difference]: Finished difference Result 5621 states and 8010 transitions. [2021-11-12 22:25:28,522 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-12 22:25:28,522 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 24.6) internal successors, (123), 5 states have internal predecessors, (123), 2 states have call successors, (27), 2 states have call predecessors, (27), 2 states have return successors, (24), 2 states have call predecessors, (24), 1 states have call successors, (24) Word has length 273 [2021-11-12 22:25:28,523 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:25:28,539 INFO L225 Difference]: With dead ends: 5621 [2021-11-12 22:25:28,540 INFO L226 Difference]: Without dead ends: 2834 [2021-11-12 22:25:28,558 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1090 GetRequests, 1076 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=44, Invalid=196, Unknown=0, NotChecked=0, Total=240 [2021-11-12 22:25:28,559 INFO L933 BasicCegarLoop]: 1893 mSDtfsCounter, 14 mSDsluCounter, 5680 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 53.37ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 7573 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 13.41ms SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 57.30ms IncrementalHoareTripleChecker+Time [2021-11-12 22:25:28,560 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 7573 Invalid, 14 Unknown, 0 Unchecked, 13.41ms Time], IncrementalHoareTripleChecker [1 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 57.30ms Time] [2021-11-12 22:25:28,567 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2834 states. [2021-11-12 22:25:28,708 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2834 to 2828. [2021-11-12 22:25:28,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2828 states, 2179 states have (on average 1.3813675998164296) internal successors, (3010), 2198 states have internal predecessors, (3010), 497 states have call successors, (497), 155 states have call predecessors, (497), 151 states have return successors, (507), 478 states have call predecessors, (507), 486 states have call successors, (507) [2021-11-12 22:25:28,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2828 states to 2828 states and 4014 transitions. [2021-11-12 22:25:28,730 INFO L78 Accepts]: Start accepts. Automaton has 2828 states and 4014 transitions. Word has length 273 [2021-11-12 22:25:28,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:25:28,731 INFO L470 AbstractCegarLoop]: Abstraction has 2828 states and 4014 transitions. [2021-11-12 22:25:28,731 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 24.6) internal successors, (123), 5 states have internal predecessors, (123), 2 states have call successors, (27), 2 states have call predecessors, (27), 2 states have return successors, (24), 2 states have call predecessors, (24), 1 states have call successors, (24) [2021-11-12 22:25:28,731 INFO L276 IsEmpty]: Start isEmpty. Operand 2828 states and 4014 transitions. [2021-11-12 22:25:28,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 292 [2021-11-12 22:25:28,744 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:25:28,744 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:25:28,761 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (27)] Forceful destruction successful, exit code 0 [2021-11-12 22:25:28,993 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (26)] Ended with exit code 0 [2021-11-12 22:25:29,159 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 22:25:29,160 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:25:29,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:25:29,160 INFO L85 PathProgramCache]: Analyzing trace with hash 736465469, now seen corresponding path program 1 times [2021-11-12 22:25:29,163 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:25:29,163 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [660905489] [2021-11-12 22:25:29,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:25:29,164 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:25:29,164 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:25:29,165 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:25:29,167 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (28)] Waiting until timeout for monitored process [2021-11-12 22:25:34,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:25:34,559 INFO L263 TraceCheckSpWp]: Trace formula consists of 1904 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 22:25:34,563 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:25:35,846 INFO L134 CoverageAnalysis]: Checked inductivity of 398 backedges. 112 proven. 1 refuted. 0 times theorem prover too weak. 285 trivial. 0 not checked. [2021-11-12 22:25:35,846 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:25:37,352 INFO L134 CoverageAnalysis]: Checked inductivity of 398 backedges. 0 proven. 71 refuted. 0 times theorem prover too weak. 327 trivial. 0 not checked. [2021-11-12 22:25:37,352 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:25:37,352 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [660905489] [2021-11-12 22:25:37,352 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [660905489] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:25:37,352 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [427717341] [2021-11-12 22:25:37,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:25:37,352 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:25:37,353 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:25:37,353 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:25:37,356 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (29)] Waiting until timeout for monitored process [2021-11-12 22:25:39,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:25:39,580 INFO L263 TraceCheckSpWp]: Trace formula consists of 1904 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-12 22:25:39,585 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:25:40,243 INFO L134 CoverageAnalysis]: Checked inductivity of 398 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 398 trivial. 0 not checked. [2021-11-12 22:25:40,244 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:25:40,891 INFO L134 CoverageAnalysis]: Checked inductivity of 398 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 398 trivial. 0 not checked. [2021-11-12 22:25:40,891 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [427717341] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 22:25:40,891 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 22:25:40,891 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [7, 7] total 12 [2021-11-12 22:25:40,892 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1792631188] [2021-11-12 22:25:40,892 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 22:25:40,892 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 22:25:40,892 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:25:40,893 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 22:25:40,893 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-11-12 22:25:40,893 INFO L87 Difference]: Start difference. First operand 2828 states and 4014 transitions. Second operand has 3 states, 3 states have (on average 48.0) internal successors, (144), 3 states have internal predecessors, (144), 3 states have call successors, (27), 3 states have call predecessors, (27), 2 states have return successors, (24), 2 states have call predecessors, (24), 1 states have call successors, (24) [2021-11-12 22:25:43,125 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.23s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 22:25:43,427 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:25:43,428 INFO L93 Difference]: Finished difference Result 5617 states and 7989 transitions. [2021-11-12 22:25:43,428 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 22:25:43,429 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 48.0) internal successors, (144), 3 states have internal predecessors, (144), 3 states have call successors, (27), 3 states have call predecessors, (27), 2 states have return successors, (24), 2 states have call predecessors, (24), 1 states have call successors, (24) Word has length 291 [2021-11-12 22:25:43,430 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:25:43,445 INFO L225 Difference]: With dead ends: 5617 [2021-11-12 22:25:43,447 INFO L226 Difference]: Without dead ends: 2830 [2021-11-12 22:25:43,467 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1160 GetRequests, 1150 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-11-12 22:25:43,468 INFO L933 BasicCegarLoop]: 2921 mSDtfsCounter, 1780 mSDsluCounter, 1724 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 5 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2269.90ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 1780 SdHoareTripleChecker+Valid, 4645 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 11.50ms SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2353.35ms IncrementalHoareTripleChecker+Time [2021-11-12 22:25:43,468 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1780 Valid, 4645 Invalid, 16 Unknown, 0 Unchecked, 11.50ms Time], IncrementalHoareTripleChecker [5 Valid, 10 Invalid, 1 Unknown, 0 Unchecked, 2353.35ms Time] [2021-11-12 22:25:43,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2830 states. [2021-11-12 22:25:43,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2830 to 2828. [2021-11-12 22:25:43,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2828 states, 2179 states have (on average 1.3795318953648463) internal successors, (3006), 2198 states have internal predecessors, (3006), 497 states have call successors, (497), 155 states have call predecessors, (497), 151 states have return successors, (487), 478 states have call predecessors, (487), 477 states have call successors, (487) [2021-11-12 22:25:43,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2828 states to 2828 states and 3990 transitions. [2021-11-12 22:25:43,639 INFO L78 Accepts]: Start accepts. Automaton has 2828 states and 3990 transitions. Word has length 291 [2021-11-12 22:25:43,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:25:43,640 INFO L470 AbstractCegarLoop]: Abstraction has 2828 states and 3990 transitions. [2021-11-12 22:25:43,641 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 48.0) internal successors, (144), 3 states have internal predecessors, (144), 3 states have call successors, (27), 3 states have call predecessors, (27), 2 states have return successors, (24), 2 states have call predecessors, (24), 1 states have call successors, (24) [2021-11-12 22:25:43,641 INFO L276 IsEmpty]: Start isEmpty. Operand 2828 states and 3990 transitions. [2021-11-12 22:25:43,646 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 292 [2021-11-12 22:25:43,647 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:25:43,647 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:25:43,703 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (28)] Forceful destruction successful, exit code 0 [2021-11-12 22:25:43,879 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (29)] Forceful destruction successful, exit code 0 [2021-11-12 22:25:44,063 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 22:25:44,063 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:25:44,064 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:25:44,064 INFO L85 PathProgramCache]: Analyzing trace with hash 1507164921, now seen corresponding path program 1 times [2021-11-12 22:25:44,067 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:25:44,067 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [404774951] [2021-11-12 22:25:44,067 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:25:44,067 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:25:44,068 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:25:44,068 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:25:44,069 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (30)] Waiting until timeout for monitored process [2021-11-12 22:25:49,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:25:49,490 INFO L263 TraceCheckSpWp]: Trace formula consists of 1904 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 22:25:49,496 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:25:50,902 INFO L134 CoverageAnalysis]: Checked inductivity of 398 backedges. 112 proven. 1 refuted. 0 times theorem prover too weak. 285 trivial. 0 not checked. [2021-11-12 22:25:50,902 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:25:52,398 INFO L134 CoverageAnalysis]: Checked inductivity of 398 backedges. 0 proven. 71 refuted. 0 times theorem prover too weak. 327 trivial. 0 not checked. [2021-11-12 22:25:52,398 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:25:52,398 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [404774951] [2021-11-12 22:25:52,398 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [404774951] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:25:52,398 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [334080420] [2021-11-12 22:25:52,398 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:25:52,398 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:25:52,399 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:25:52,399 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:25:52,401 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (31)] Waiting until timeout for monitored process [2021-11-12 22:25:54,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:25:54,565 INFO L263 TraceCheckSpWp]: Trace formula consists of 1904 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-12 22:25:54,570 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:25:55,380 INFO L134 CoverageAnalysis]: Checked inductivity of 398 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 398 trivial. 0 not checked. [2021-11-12 22:25:55,380 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:25:56,385 INFO L134 CoverageAnalysis]: Checked inductivity of 398 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 398 trivial. 0 not checked. [2021-11-12 22:25:56,386 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [334080420] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 22:25:56,386 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 22:25:56,386 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [7, 7] total 19 [2021-11-12 22:25:56,386 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2011264762] [2021-11-12 22:25:56,387 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 22:25:56,387 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-12 22:25:56,387 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:25:56,388 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-12 22:25:56,388 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=294, Unknown=0, NotChecked=0, Total=342 [2021-11-12 22:25:56,388 INFO L87 Difference]: Start difference. First operand 2828 states and 3990 transitions. Second operand has 10 states, 10 states have (on average 14.9) internal successors, (149), 8 states have internal predecessors, (149), 2 states have call successors, (27), 2 states have call predecessors, (27), 3 states have return successors, (25), 3 states have call predecessors, (25), 1 states have call successors, (25) [2021-11-12 22:25:57,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:25:57,466 INFO L93 Difference]: Finished difference Result 5642 states and 7973 transitions. [2021-11-12 22:25:57,467 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-12 22:25:57,467 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 14.9) internal successors, (149), 8 states have internal predecessors, (149), 2 states have call successors, (27), 2 states have call predecessors, (27), 3 states have return successors, (25), 3 states have call predecessors, (25), 1 states have call successors, (25) Word has length 291 [2021-11-12 22:25:57,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:25:57,484 INFO L225 Difference]: With dead ends: 5642 [2021-11-12 22:25:57,484 INFO L226 Difference]: Without dead ends: 2855 [2021-11-12 22:25:57,495 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1164 GetRequests, 1143 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=69, Invalid=437, Unknown=0, NotChecked=0, Total=506 [2021-11-12 22:25:57,496 INFO L933 BasicCegarLoop]: 1905 mSDtfsCounter, 233 mSDsluCounter, 11088 mSDsCounter, 0 mSdLazyCounter, 104 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 489.51ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 278 SdHoareTripleChecker+Valid, 12993 SdHoareTripleChecker+Invalid, 108 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 22.68ms SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 104 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 544.93ms IncrementalHoareTripleChecker+Time [2021-11-12 22:25:57,497 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [278 Valid, 12993 Invalid, 108 Unknown, 0 Unchecked, 22.68ms Time], IncrementalHoareTripleChecker [4 Valid, 104 Invalid, 0 Unknown, 0 Unchecked, 544.93ms Time] [2021-11-12 22:25:57,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2855 states. [2021-11-12 22:25:57,657 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2855 to 2840. [2021-11-12 22:25:57,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2840 states, 2188 states have (on average 1.3779707495429616) internal successors, (3015), 2208 states have internal predecessors, (3015), 497 states have call successors, (497), 155 states have call predecessors, (497), 154 states have return successors, (495), 480 states have call predecessors, (495), 477 states have call successors, (495) [2021-11-12 22:25:57,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2840 states to 2840 states and 4007 transitions. [2021-11-12 22:25:57,676 INFO L78 Accepts]: Start accepts. Automaton has 2840 states and 4007 transitions. Word has length 291 [2021-11-12 22:25:57,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:25:57,677 INFO L470 AbstractCegarLoop]: Abstraction has 2840 states and 4007 transitions. [2021-11-12 22:25:57,677 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 14.9) internal successors, (149), 8 states have internal predecessors, (149), 2 states have call successors, (27), 2 states have call predecessors, (27), 3 states have return successors, (25), 3 states have call predecessors, (25), 1 states have call successors, (25) [2021-11-12 22:25:57,678 INFO L276 IsEmpty]: Start isEmpty. Operand 2840 states and 4007 transitions. [2021-11-12 22:25:57,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 274 [2021-11-12 22:25:57,684 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:25:57,684 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:25:57,742 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (30)] Forceful destruction successful, exit code 0 [2021-11-12 22:25:57,916 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (31)] Forceful destruction successful, exit code 0 [2021-11-12 22:25:58,095 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 22:25:58,095 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:25:58,096 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:25:58,096 INFO L85 PathProgramCache]: Analyzing trace with hash 1204942365, now seen corresponding path program 1 times [2021-11-12 22:25:58,099 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:25:58,099 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [912616957] [2021-11-12 22:25:58,099 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:25:58,099 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:25:58,100 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:25:58,100 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:25:58,102 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (32)] Waiting until timeout for monitored process [2021-11-12 22:26:03,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:26:03,567 INFO L263 TraceCheckSpWp]: Trace formula consists of 1888 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 22:26:03,572 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:26:04,897 INFO L134 CoverageAnalysis]: Checked inductivity of 401 backedges. 112 proven. 1 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2021-11-12 22:26:04,897 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:26:06,300 INFO L134 CoverageAnalysis]: Checked inductivity of 401 backedges. 0 proven. 71 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2021-11-12 22:26:06,300 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:26:06,300 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [912616957] [2021-11-12 22:26:06,300 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [912616957] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:26:06,300 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [54862606] [2021-11-12 22:26:06,301 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:26:06,301 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:26:06,301 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:26:06,303 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:26:06,304 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (33)] Waiting until timeout for monitored process [2021-11-12 22:26:08,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:26:08,387 INFO L263 TraceCheckSpWp]: Trace formula consists of 1888 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-12 22:26:08,391 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:26:09,013 INFO L134 CoverageAnalysis]: Checked inductivity of 401 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 401 trivial. 0 not checked. [2021-11-12 22:26:09,013 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:26:09,759 INFO L134 CoverageAnalysis]: Checked inductivity of 401 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 401 trivial. 0 not checked. [2021-11-12 22:26:09,760 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [54862606] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 22:26:09,760 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 22:26:09,760 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [7, 7] total 17 [2021-11-12 22:26:09,760 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [98179228] [2021-11-12 22:26:09,761 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 22:26:09,761 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-12 22:26:09,761 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:26:09,762 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-12 22:26:09,762 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=229, Unknown=0, NotChecked=0, Total=272 [2021-11-12 22:26:09,762 INFO L87 Difference]: Start difference. First operand 2840 states and 4007 transitions. Second operand has 8 states, 8 states have (on average 15.875) internal successors, (127), 8 states have internal predecessors, (127), 2 states have call successors, (27), 2 states have call predecessors, (27), 2 states have return successors, (24), 2 states have call predecessors, (24), 1 states have call successors, (24) [2021-11-12 22:26:10,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:26:10,124 INFO L93 Difference]: Finished difference Result 5642 states and 7974 transitions. [2021-11-12 22:26:10,125 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-12 22:26:10,125 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 15.875) internal successors, (127), 8 states have internal predecessors, (127), 2 states have call successors, (27), 2 states have call predecessors, (27), 2 states have return successors, (24), 2 states have call predecessors, (24), 1 states have call successors, (24) Word has length 273 [2021-11-12 22:26:10,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:26:10,140 INFO L225 Difference]: With dead ends: 5642 [2021-11-12 22:26:10,140 INFO L226 Difference]: Without dead ends: 2843 [2021-11-12 22:26:10,150 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1090 GetRequests, 1073 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=58, Invalid=284, Unknown=0, NotChecked=0, Total=342 [2021-11-12 22:26:10,151 INFO L933 BasicCegarLoop]: 1899 mSDtfsCounter, 19 mSDsluCounter, 7574 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 59.68ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 9473 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 11.69ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 63.40ms IncrementalHoareTripleChecker+Time [2021-11-12 22:26:10,151 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 9473 Invalid, 16 Unknown, 0 Unchecked, 11.69ms Time], IncrementalHoareTripleChecker [0 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 63.40ms Time] [2021-11-12 22:26:10,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2843 states. [2021-11-12 22:26:10,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2843 to 2840. [2021-11-12 22:26:10,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2840 states, 2188 states have (on average 1.3775137111517368) internal successors, (3014), 2208 states have internal predecessors, (3014), 497 states have call successors, (497), 155 states have call predecessors, (497), 154 states have return successors, (495), 480 states have call predecessors, (495), 477 states have call successors, (495) [2021-11-12 22:26:10,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2840 states to 2840 states and 4006 transitions. [2021-11-12 22:26:10,317 INFO L78 Accepts]: Start accepts. Automaton has 2840 states and 4006 transitions. Word has length 273 [2021-11-12 22:26:10,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:26:10,321 INFO L470 AbstractCegarLoop]: Abstraction has 2840 states and 4006 transitions. [2021-11-12 22:26:10,321 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 15.875) internal successors, (127), 8 states have internal predecessors, (127), 2 states have call successors, (27), 2 states have call predecessors, (27), 2 states have return successors, (24), 2 states have call predecessors, (24), 1 states have call successors, (24) [2021-11-12 22:26:10,321 INFO L276 IsEmpty]: Start isEmpty. Operand 2840 states and 4006 transitions. [2021-11-12 22:26:10,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 282 [2021-11-12 22:26:10,328 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:26:10,328 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:26:10,380 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (32)] Forceful destruction successful, exit code 0 [2021-11-12 22:26:10,548 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (33)] Forceful destruction successful, exit code 0 [2021-11-12 22:26:10,729 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 22:26:10,729 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:26:10,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:26:10,730 INFO L85 PathProgramCache]: Analyzing trace with hash 669148454, now seen corresponding path program 1 times [2021-11-12 22:26:10,733 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:26:10,734 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1324232442] [2021-11-12 22:26:10,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:26:10,734 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:26:10,734 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:26:10,735 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:26:10,775 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (34)] Waiting until timeout for monitored process [2021-11-12 22:26:15,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:26:15,914 INFO L263 TraceCheckSpWp]: Trace formula consists of 1897 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 22:26:15,918 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:26:17,155 INFO L134 CoverageAnalysis]: Checked inductivity of 401 backedges. 112 proven. 1 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2021-11-12 22:26:17,155 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:26:18,788 INFO L134 CoverageAnalysis]: Checked inductivity of 401 backedges. 0 proven. 71 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2021-11-12 22:26:18,788 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:26:18,788 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1324232442] [2021-11-12 22:26:18,788 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1324232442] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:26:18,788 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [601223965] [2021-11-12 22:26:18,788 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:26:18,789 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:26:18,789 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:26:18,789 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:26:18,790 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (35)] Waiting until timeout for monitored process [2021-11-12 22:26:20,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:26:20,960 INFO L263 TraceCheckSpWp]: Trace formula consists of 1897 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 22:26:20,964 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:26:21,751 INFO L134 CoverageAnalysis]: Checked inductivity of 401 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 401 trivial. 0 not checked. [2021-11-12 22:26:21,751 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:26:22,441 INFO L134 CoverageAnalysis]: Checked inductivity of 401 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 401 trivial. 0 not checked. [2021-11-12 22:26:22,441 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [601223965] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 22:26:22,441 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 22:26:22,442 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [7, 7] total 15 [2021-11-12 22:26:22,442 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1832415381] [2021-11-12 22:26:22,442 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 22:26:22,443 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-12 22:26:22,444 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:26:22,444 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-12 22:26:22,444 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=174, Unknown=0, NotChecked=0, Total=210 [2021-11-12 22:26:22,445 INFO L87 Difference]: Start difference. First operand 2840 states and 4006 transitions. Second operand has 6 states, 6 states have (on average 21.166666666666668) internal successors, (127), 5 states have internal predecessors, (127), 2 states have call successors, (29), 2 states have call predecessors, (29), 3 states have return successors, (26), 3 states have call predecessors, (26), 1 states have call successors, (26) [2021-11-12 22:26:22,758 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:26:22,759 INFO L93 Difference]: Finished difference Result 5452 states and 7671 transitions. [2021-11-12 22:26:22,759 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-12 22:26:22,759 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 21.166666666666668) internal successors, (127), 5 states have internal predecessors, (127), 2 states have call successors, (29), 2 states have call predecessors, (29), 3 states have return successors, (26), 3 states have call predecessors, (26), 1 states have call successors, (26) Word has length 281 [2021-11-12 22:26:22,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:26:22,776 INFO L225 Difference]: With dead ends: 5452 [2021-11-12 22:26:22,777 INFO L226 Difference]: Without dead ends: 2653 [2021-11-12 22:26:22,785 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1121 GetRequests, 1107 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=40, Invalid=200, Unknown=0, NotChecked=0, Total=240 [2021-11-12 22:26:22,787 INFO L933 BasicCegarLoop]: 1897 mSDtfsCounter, 9 mSDsluCounter, 7581 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 66.33ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 9478 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 14.38ms SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 70.57ms IncrementalHoareTripleChecker+Time [2021-11-12 22:26:22,787 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 9478 Invalid, 19 Unknown, 0 Unchecked, 14.38ms Time], IncrementalHoareTripleChecker [1 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 70.57ms Time] [2021-11-12 22:26:22,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2653 states. [2021-11-12 22:26:22,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2653 to 2650. [2021-11-12 22:26:22,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2650 states, 2039 states have (on average 1.3683178028445315) internal successors, (2790), 2058 states have internal predecessors, (2790), 460 states have call successors, (460), 152 states have call predecessors, (460), 150 states have return successors, (454), 443 states have call predecessors, (454), 440 states have call successors, (454) [2021-11-12 22:26:22,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2650 states to 2650 states and 3704 transitions. [2021-11-12 22:26:22,927 INFO L78 Accepts]: Start accepts. Automaton has 2650 states and 3704 transitions. Word has length 281 [2021-11-12 22:26:22,928 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:26:22,928 INFO L470 AbstractCegarLoop]: Abstraction has 2650 states and 3704 transitions. [2021-11-12 22:26:22,928 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 21.166666666666668) internal successors, (127), 5 states have internal predecessors, (127), 2 states have call successors, (29), 2 states have call predecessors, (29), 3 states have return successors, (26), 3 states have call predecessors, (26), 1 states have call successors, (26) [2021-11-12 22:26:22,928 INFO L276 IsEmpty]: Start isEmpty. Operand 2650 states and 3704 transitions. [2021-11-12 22:26:22,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 291 [2021-11-12 22:26:22,934 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:26:22,935 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:26:22,990 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (34)] Forceful destruction successful, exit code 0 [2021-11-12 22:26:23,165 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (35)] Ended with exit code 0 [2021-11-12 22:26:23,352 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 22:26:23,352 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:26:23,352 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:26:23,353 INFO L85 PathProgramCache]: Analyzing trace with hash -234352083, now seen corresponding path program 1 times [2021-11-12 22:26:23,356 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:26:23,356 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1448645174] [2021-11-12 22:26:23,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:26:23,357 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:26:23,357 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:26:23,358 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:26:23,359 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (36)] Waiting until timeout for monitored process [2021-11-12 22:26:28,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:26:28,741 INFO L263 TraceCheckSpWp]: Trace formula consists of 2038 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 22:26:28,745 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:26:30,081 INFO L134 CoverageAnalysis]: Checked inductivity of 401 backedges. 112 proven. 1 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2021-11-12 22:26:30,081 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:26:31,750 INFO L134 CoverageAnalysis]: Checked inductivity of 401 backedges. 0 proven. 71 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2021-11-12 22:26:31,750 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:26:31,750 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1448645174] [2021-11-12 22:26:31,750 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1448645174] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:26:31,751 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1103687760] [2021-11-12 22:26:31,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:26:31,751 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:26:31,751 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:26:31,752 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:26:31,753 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (37)] Waiting until timeout for monitored process [2021-11-12 22:26:34,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:26:34,096 INFO L263 TraceCheckSpWp]: Trace formula consists of 2038 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 22:26:34,106 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:26:34,730 INFO L134 CoverageAnalysis]: Checked inductivity of 401 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 398 trivial. 0 not checked. [2021-11-12 22:26:34,730 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:26:35,222 INFO L134 CoverageAnalysis]: Checked inductivity of 401 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 401 trivial. 0 not checked. [2021-11-12 22:26:35,222 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1103687760] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 22:26:35,222 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 22:26:35,223 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [7, 7] total 12 [2021-11-12 22:26:35,223 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [598148516] [2021-11-12 22:26:35,223 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 22:26:35,224 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 22:26:35,224 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:26:35,224 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 22:26:35,225 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-11-12 22:26:35,225 INFO L87 Difference]: Start difference. First operand 2650 states and 3704 transitions. Second operand has 3 states, 3 states have (on average 52.666666666666664) internal successors, (158), 3 states have internal predecessors, (158), 2 states have call successors, (32), 2 states have call predecessors, (32), 2 states have return successors, (30), 2 states have call predecessors, (30), 2 states have call successors, (30) [2021-11-12 22:26:35,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:26:35,349 INFO L93 Difference]: Finished difference Result 5261 states and 7362 transitions. [2021-11-12 22:26:35,350 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 22:26:35,350 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 52.666666666666664) internal successors, (158), 3 states have internal predecessors, (158), 2 states have call successors, (32), 2 states have call predecessors, (32), 2 states have return successors, (30), 2 states have call predecessors, (30), 2 states have call successors, (30) Word has length 290 [2021-11-12 22:26:35,351 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:26:35,362 INFO L225 Difference]: With dead ends: 5261 [2021-11-12 22:26:35,362 INFO L226 Difference]: Without dead ends: 2652 [2021-11-12 22:26:35,368 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1156 GetRequests, 1146 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-11-12 22:26:35,369 INFO L933 BasicCegarLoop]: 1894 mSDtfsCounter, 0 mSDsluCounter, 1889 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 24.98ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 3783 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.57ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 30.52ms IncrementalHoareTripleChecker+Time [2021-11-12 22:26:35,369 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 3783 Invalid, 6 Unknown, 0 Unchecked, 4.57ms Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 30.52ms Time] [2021-11-12 22:26:35,373 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2652 states. [2021-11-12 22:26:35,478 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2652 to 2652. [2021-11-12 22:26:35,481 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2652 states, 2041 states have (on average 1.3679568838804508) internal successors, (2792), 2060 states have internal predecessors, (2792), 460 states have call successors, (460), 152 states have call predecessors, (460), 150 states have return successors, (454), 443 states have call predecessors, (454), 440 states have call successors, (454) [2021-11-12 22:26:35,490 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2652 states to 2652 states and 3706 transitions. [2021-11-12 22:26:35,492 INFO L78 Accepts]: Start accepts. Automaton has 2652 states and 3706 transitions. Word has length 290 [2021-11-12 22:26:35,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:26:35,492 INFO L470 AbstractCegarLoop]: Abstraction has 2652 states and 3706 transitions. [2021-11-12 22:26:35,493 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 52.666666666666664) internal successors, (158), 3 states have internal predecessors, (158), 2 states have call successors, (32), 2 states have call predecessors, (32), 2 states have return successors, (30), 2 states have call predecessors, (30), 2 states have call successors, (30) [2021-11-12 22:26:35,493 INFO L276 IsEmpty]: Start isEmpty. Operand 2652 states and 3706 transitions. [2021-11-12 22:26:35,498 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 291 [2021-11-12 22:26:35,498 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:26:35,499 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:26:35,517 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (37)] Forceful destruction successful, exit code 0 [2021-11-12 22:26:35,775 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (36)] Forceful destruction successful, exit code 0 [2021-11-12 22:26:35,935 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt,36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 22:26:35,935 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:26:35,935 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:26:35,935 INFO L85 PathProgramCache]: Analyzing trace with hash -1606159381, now seen corresponding path program 1 times [2021-11-12 22:26:35,939 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:26:35,940 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1542985412] [2021-11-12 22:26:35,940 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:26:35,940 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:26:35,940 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:26:35,941 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:26:35,985 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (38)] Waiting until timeout for monitored process [2021-11-12 22:26:41,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:26:41,349 INFO L263 TraceCheckSpWp]: Trace formula consists of 2041 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 22:26:41,354 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:26:42,635 INFO L134 CoverageAnalysis]: Checked inductivity of 401 backedges. 112 proven. 1 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2021-11-12 22:26:42,635 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:26:44,131 INFO L134 CoverageAnalysis]: Checked inductivity of 401 backedges. 0 proven. 71 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2021-11-12 22:26:44,131 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:26:44,131 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1542985412] [2021-11-12 22:26:44,131 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1542985412] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:26:44,131 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [531298681] [2021-11-12 22:26:44,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:26:44,131 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:26:44,132 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:26:44,132 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:26:44,135 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (39)] Waiting until timeout for monitored process [2021-11-12 22:26:46,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:26:46,537 INFO L263 TraceCheckSpWp]: Trace formula consists of 2041 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-12 22:26:46,544 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:26:47,297 INFO L134 CoverageAnalysis]: Checked inductivity of 401 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 398 trivial. 0 not checked. [2021-11-12 22:26:47,297 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:26:48,254 INFO L134 CoverageAnalysis]: Checked inductivity of 401 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 401 trivial. 0 not checked. [2021-11-12 22:26:48,254 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [531298681] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 22:26:48,255 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 22:26:48,255 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [7, 7] total 19 [2021-11-12 22:26:48,255 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [680005875] [2021-11-12 22:26:48,255 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 22:26:48,256 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-12 22:26:48,256 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:26:48,257 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-12 22:26:48,257 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=294, Unknown=0, NotChecked=0, Total=342 [2021-11-12 22:26:48,257 INFO L87 Difference]: Start difference. First operand 2652 states and 3706 transitions. Second operand has 10 states, 10 states have (on average 15.0) internal successors, (150), 8 states have internal predecessors, (150), 2 states have call successors, (30), 2 states have call predecessors, (30), 4 states have return successors, (29), 4 states have call predecessors, (29), 2 states have call successors, (29) [2021-11-12 22:26:49,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:26:49,129 INFO L93 Difference]: Finished difference Result 6138 states and 8620 transitions. [2021-11-12 22:26:49,129 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-12 22:26:49,129 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 15.0) internal successors, (150), 8 states have internal predecessors, (150), 2 states have call successors, (30), 2 states have call predecessors, (30), 4 states have return successors, (29), 4 states have call predecessors, (29), 2 states have call successors, (29) Word has length 290 [2021-11-12 22:26:49,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:26:49,148 INFO L225 Difference]: With dead ends: 6138 [2021-11-12 22:26:49,149 INFO L226 Difference]: Without dead ends: 3527 [2021-11-12 22:26:49,157 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1158 GetRequests, 1139 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2021-11-12 22:26:49,158 INFO L933 BasicCegarLoop]: 2333 mSDtfsCounter, 371 mSDsluCounter, 13320 mSDsCounter, 0 mSdLazyCounter, 80 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 428.09ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 437 SdHoareTripleChecker+Valid, 15653 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 22.00ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 80 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 481.96ms IncrementalHoareTripleChecker+Time [2021-11-12 22:26:49,159 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [437 Valid, 15653 Invalid, 82 Unknown, 0 Unchecked, 22.00ms Time], IncrementalHoareTripleChecker [2 Valid, 80 Invalid, 0 Unknown, 0 Unchecked, 481.96ms Time] [2021-11-12 22:26:49,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3527 states. [2021-11-12 22:26:49,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3527 to 2485. [2021-11-12 22:26:49,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2485 states, 1906 states have (on average 1.3541448058761805) internal successors, (2581), 1921 states have internal predecessors, (2581), 428 states have call successors, (428), 151 states have call predecessors, (428), 150 states have return successors, (424), 416 states have call predecessors, (424), 411 states have call successors, (424) [2021-11-12 22:26:49,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2485 states to 2485 states and 3433 transitions. [2021-11-12 22:26:49,333 INFO L78 Accepts]: Start accepts. Automaton has 2485 states and 3433 transitions. Word has length 290 [2021-11-12 22:26:49,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:26:49,334 INFO L470 AbstractCegarLoop]: Abstraction has 2485 states and 3433 transitions. [2021-11-12 22:26:49,334 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 15.0) internal successors, (150), 8 states have internal predecessors, (150), 2 states have call successors, (30), 2 states have call predecessors, (30), 4 states have return successors, (29), 4 states have call predecessors, (29), 2 states have call successors, (29) [2021-11-12 22:26:49,334 INFO L276 IsEmpty]: Start isEmpty. Operand 2485 states and 3433 transitions. [2021-11-12 22:26:49,340 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 292 [2021-11-12 22:26:49,340 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:26:49,341 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:26:49,363 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (39)] Forceful destruction successful, exit code 0 [2021-11-12 22:26:49,625 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (38)] Forceful destruction successful, exit code 0 [2021-11-12 22:26:49,757 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 22:26:49,757 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:26:49,758 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:26:49,758 INFO L85 PathProgramCache]: Analyzing trace with hash 1935373154, now seen corresponding path program 1 times [2021-11-12 22:26:49,763 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:26:49,763 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1132577334] [2021-11-12 22:26:49,763 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:26:49,763 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:26:49,763 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:26:49,765 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:26:49,805 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (40)] Waiting until timeout for monitored process [2021-11-12 22:26:54,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:26:54,952 INFO L263 TraceCheckSpWp]: Trace formula consists of 1962 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 22:26:54,957 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:26:56,215 INFO L134 CoverageAnalysis]: Checked inductivity of 401 backedges. 112 proven. 1 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2021-11-12 22:26:56,216 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:26:57,673 INFO L134 CoverageAnalysis]: Checked inductivity of 401 backedges. 0 proven. 71 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2021-11-12 22:26:57,673 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:26:57,673 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1132577334] [2021-11-12 22:26:57,673 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1132577334] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:26:57,673 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [200699185] [2021-11-12 22:26:57,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:26:57,674 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:26:57,674 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:26:57,676 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:26:57,678 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (41)] Waiting until timeout for monitored process [2021-11-12 22:26:59,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:26:59,807 INFO L263 TraceCheckSpWp]: Trace formula consists of 1962 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 22:26:59,812 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:27:00,473 INFO L134 CoverageAnalysis]: Checked inductivity of 401 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 398 trivial. 0 not checked. [2021-11-12 22:27:00,473 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:27:00,976 INFO L134 CoverageAnalysis]: Checked inductivity of 401 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 401 trivial. 0 not checked. [2021-11-12 22:27:00,976 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [200699185] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 22:27:00,976 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 22:27:00,977 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [7, 7] total 12 [2021-11-12 22:27:00,977 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [400399721] [2021-11-12 22:27:00,977 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 22:27:00,978 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 22:27:00,978 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:27:00,978 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 22:27:00,978 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-11-12 22:27:00,978 INFO L87 Difference]: Start difference. First operand 2485 states and 3433 transitions. Second operand has 3 states, 3 states have (on average 52.666666666666664) internal successors, (158), 3 states have internal predecessors, (158), 2 states have call successors, (32), 2 states have call predecessors, (32), 2 states have return successors, (30), 2 states have call predecessors, (30), 2 states have call successors, (30) [2021-11-12 22:27:01,104 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:27:01,104 INFO L93 Difference]: Finished difference Result 4931 states and 6820 transitions. [2021-11-12 22:27:01,105 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 22:27:01,105 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 52.666666666666664) internal successors, (158), 3 states have internal predecessors, (158), 2 states have call successors, (32), 2 states have call predecessors, (32), 2 states have return successors, (30), 2 states have call predecessors, (30), 2 states have call successors, (30) Word has length 291 [2021-11-12 22:27:01,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:27:01,118 INFO L225 Difference]: With dead ends: 4931 [2021-11-12 22:27:01,118 INFO L226 Difference]: Without dead ends: 2487 [2021-11-12 22:27:01,125 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1160 GetRequests, 1150 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-11-12 22:27:01,126 INFO L933 BasicCegarLoop]: 1857 mSDtfsCounter, 0 mSDsluCounter, 1852 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 28.83ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 3709 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.06ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 32.74ms IncrementalHoareTripleChecker+Time [2021-11-12 22:27:01,127 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 3709 Invalid, 6 Unknown, 0 Unchecked, 4.06ms Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 32.74ms Time] [2021-11-12 22:27:01,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2487 states. [2021-11-12 22:27:01,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2487 to 2487. [2021-11-12 22:27:01,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2487 states, 1908 states have (on average 1.3537735849056605) internal successors, (2583), 1923 states have internal predecessors, (2583), 428 states have call successors, (428), 151 states have call predecessors, (428), 150 states have return successors, (424), 416 states have call predecessors, (424), 411 states have call successors, (424) [2021-11-12 22:27:01,279 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2487 states to 2487 states and 3435 transitions. [2021-11-12 22:27:01,281 INFO L78 Accepts]: Start accepts. Automaton has 2487 states and 3435 transitions. Word has length 291 [2021-11-12 22:27:01,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:27:01,282 INFO L470 AbstractCegarLoop]: Abstraction has 2487 states and 3435 transitions. [2021-11-12 22:27:01,282 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 52.666666666666664) internal successors, (158), 3 states have internal predecessors, (158), 2 states have call successors, (32), 2 states have call predecessors, (32), 2 states have return successors, (30), 2 states have call predecessors, (30), 2 states have call successors, (30) [2021-11-12 22:27:01,282 INFO L276 IsEmpty]: Start isEmpty. Operand 2487 states and 3435 transitions. [2021-11-12 22:27:01,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 292 [2021-11-12 22:27:01,289 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:27:01,289 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:27:01,346 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (40)] Forceful destruction successful, exit code 0 [2021-11-12 22:27:01,525 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (41)] Forceful destruction successful, exit code 0 [2021-11-12 22:27:01,703 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 22:27:01,703 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:27:01,704 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:27:01,704 INFO L85 PathProgramCache]: Analyzing trace with hash 563565856, now seen corresponding path program 1 times [2021-11-12 22:27:01,708 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:27:01,709 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1615422174] [2021-11-12 22:27:01,709 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:27:01,709 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:27:01,709 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:27:01,711 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:27:01,735 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (42)] Waiting until timeout for monitored process [2021-11-12 22:27:06,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:27:06,835 INFO L263 TraceCheckSpWp]: Trace formula consists of 1965 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 22:27:06,843 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:27:08,063 INFO L134 CoverageAnalysis]: Checked inductivity of 401 backedges. 112 proven. 1 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2021-11-12 22:27:08,063 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:27:09,451 INFO L134 CoverageAnalysis]: Checked inductivity of 401 backedges. 0 proven. 71 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2021-11-12 22:27:09,451 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:27:09,451 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1615422174] [2021-11-12 22:27:09,451 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1615422174] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:27:09,451 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1241847714] [2021-11-12 22:27:09,451 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:27:09,452 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:27:09,452 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:27:09,452 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:27:09,454 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (43)] Waiting until timeout for monitored process [2021-11-12 22:27:11,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:27:11,416 INFO L263 TraceCheckSpWp]: Trace formula consists of 1965 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-12 22:27:11,420 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:27:12,177 INFO L134 CoverageAnalysis]: Checked inductivity of 401 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 398 trivial. 0 not checked. [2021-11-12 22:27:12,177 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:27:13,085 INFO L134 CoverageAnalysis]: Checked inductivity of 401 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 401 trivial. 0 not checked. [2021-11-12 22:27:13,085 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1241847714] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 22:27:13,085 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 22:27:13,085 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [7, 7] total 19 [2021-11-12 22:27:13,086 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1331849568] [2021-11-12 22:27:13,086 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 22:27:13,086 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-12 22:27:13,086 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:27:13,086 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-12 22:27:13,087 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=294, Unknown=0, NotChecked=0, Total=342 [2021-11-12 22:27:13,087 INFO L87 Difference]: Start difference. First operand 2487 states and 3435 transitions. Second operand has 10 states, 10 states have (on average 15.0) internal successors, (150), 8 states have internal predecessors, (150), 2 states have call successors, (30), 2 states have call predecessors, (30), 4 states have return successors, (29), 4 states have call predecessors, (29), 2 states have call successors, (29) [2021-11-12 22:27:13,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:27:13,930 INFO L93 Difference]: Finished difference Result 5773 states and 8069 transitions. [2021-11-12 22:27:13,933 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-12 22:27:13,933 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 15.0) internal successors, (150), 8 states have internal predecessors, (150), 2 states have call successors, (30), 2 states have call predecessors, (30), 4 states have return successors, (29), 4 states have call predecessors, (29), 2 states have call successors, (29) Word has length 291 [2021-11-12 22:27:13,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:27:13,950 INFO L225 Difference]: With dead ends: 5773 [2021-11-12 22:27:13,951 INFO L226 Difference]: Without dead ends: 3327 [2021-11-12 22:27:13,958 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1162 GetRequests, 1143 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2021-11-12 22:27:13,959 INFO L933 BasicCegarLoop]: 2337 mSDtfsCounter, 367 mSDsluCounter, 15672 mSDsCounter, 0 mSdLazyCounter, 84 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 387.99ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 433 SdHoareTripleChecker+Valid, 18009 SdHoareTripleChecker+Invalid, 86 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 19.39ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 84 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 444.34ms IncrementalHoareTripleChecker+Time [2021-11-12 22:27:13,959 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [433 Valid, 18009 Invalid, 86 Unknown, 0 Unchecked, 19.39ms Time], IncrementalHoareTripleChecker [2 Valid, 84 Invalid, 0 Unknown, 0 Unchecked, 444.34ms Time] [2021-11-12 22:27:13,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3327 states. [2021-11-12 22:27:14,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3327 to 2287. [2021-11-12 22:27:14,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2287 states, 1757 states have (on average 1.3545816733067728) internal successors, (2380), 1770 states have internal predecessors, (2380), 391 states have call successors, (391), 139 states have call predecessors, (391), 138 states have return successors, (388), 381 states have call predecessors, (388), 375 states have call successors, (388) [2021-11-12 22:27:14,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2287 states to 2287 states and 3159 transitions. [2021-11-12 22:27:14,112 INFO L78 Accepts]: Start accepts. Automaton has 2287 states and 3159 transitions. Word has length 291 [2021-11-12 22:27:14,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:27:14,113 INFO L470 AbstractCegarLoop]: Abstraction has 2287 states and 3159 transitions. [2021-11-12 22:27:14,113 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 15.0) internal successors, (150), 8 states have internal predecessors, (150), 2 states have call successors, (30), 2 states have call predecessors, (30), 4 states have return successors, (29), 4 states have call predecessors, (29), 2 states have call successors, (29) [2021-11-12 22:27:14,113 INFO L276 IsEmpty]: Start isEmpty. Operand 2287 states and 3159 transitions. [2021-11-12 22:27:14,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 312 [2021-11-12 22:27:14,121 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:27:14,121 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:27:14,174 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (42)] Forceful destruction successful, exit code 0 [2021-11-12 22:27:14,362 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (43)] Forceful destruction successful, exit code 0 [2021-11-12 22:27:14,543 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 22:27:14,543 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:27:14,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:27:14,544 INFO L85 PathProgramCache]: Analyzing trace with hash 2023723363, now seen corresponding path program 1 times [2021-11-12 22:27:14,548 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:27:14,548 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [223772999] [2021-11-12 22:27:14,549 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:27:14,549 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:27:14,549 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:27:14,550 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:27:14,591 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (44)] Waiting until timeout for monitored process [2021-11-12 22:27:19,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:27:19,465 INFO L263 TraceCheckSpWp]: Trace formula consists of 1956 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 22:27:19,469 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:27:20,759 INFO L134 CoverageAnalysis]: Checked inductivity of 418 backedges. 112 proven. 1 refuted. 0 times theorem prover too weak. 305 trivial. 0 not checked. [2021-11-12 22:27:20,759 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:27:22,193 INFO L134 CoverageAnalysis]: Checked inductivity of 418 backedges. 0 proven. 71 refuted. 0 times theorem prover too weak. 347 trivial. 0 not checked. [2021-11-12 22:27:22,193 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:27:22,193 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [223772999] [2021-11-12 22:27:22,193 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [223772999] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:27:22,193 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [592661067] [2021-11-12 22:27:22,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:27:22,193 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:27:22,193 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:27:22,194 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:27:22,201 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (45)] Waiting until timeout for monitored process [2021-11-12 22:27:24,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:27:24,101 INFO L263 TraceCheckSpWp]: Trace formula consists of 1956 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-12 22:27:24,108 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:27:25,036 INFO L134 CoverageAnalysis]: Checked inductivity of 418 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 404 trivial. 0 not checked. [2021-11-12 22:27:25,036 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:27:25,857 INFO L134 CoverageAnalysis]: Checked inductivity of 418 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 407 trivial. 0 not checked. [2021-11-12 22:27:25,857 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [592661067] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 22:27:25,857 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 22:27:25,857 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [7, 7] total 15 [2021-11-12 22:27:25,857 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1546641002] [2021-11-12 22:27:25,858 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 22:27:25,858 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-12 22:27:25,858 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:27:25,859 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-12 22:27:25,859 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=174, Unknown=0, NotChecked=0, Total=210 [2021-11-12 22:27:25,860 INFO L87 Difference]: Start difference. First operand 2287 states and 3159 transitions. Second operand has 6 states, 6 states have (on average 26.166666666666668) internal successors, (157), 5 states have internal predecessors, (157), 3 states have call successors, (38), 2 states have call predecessors, (38), 3 states have return successors, (37), 4 states have call predecessors, (37), 3 states have call successors, (37) [2021-11-12 22:27:26,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:27:26,152 INFO L93 Difference]: Finished difference Result 2975 states and 4083 transitions. [2021-11-12 22:27:26,152 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-12 22:27:26,152 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 26.166666666666668) internal successors, (157), 5 states have internal predecessors, (157), 3 states have call successors, (38), 2 states have call predecessors, (38), 3 states have return successors, (37), 4 states have call predecessors, (37), 3 states have call successors, (37) Word has length 311 [2021-11-12 22:27:26,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:27:26,163 INFO L225 Difference]: With dead ends: 2975 [2021-11-12 22:27:26,163 INFO L226 Difference]: Without dead ends: 2287 [2021-11-12 22:27:26,166 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1241 GetRequests, 1227 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=40, Invalid=200, Unknown=0, NotChecked=0, Total=240 [2021-11-12 22:27:26,167 INFO L933 BasicCegarLoop]: 1857 mSDtfsCounter, 215 mSDsluCounter, 7152 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 80.02ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 254 SdHoareTripleChecker+Valid, 9009 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 8.53ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 87.20ms IncrementalHoareTripleChecker+Time [2021-11-12 22:27:26,167 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [254 Valid, 9009 Invalid, 27 Unknown, 0 Unchecked, 8.53ms Time], IncrementalHoareTripleChecker [0 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 87.20ms Time] [2021-11-12 22:27:26,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2287 states. [2021-11-12 22:27:26,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2287 to 2287. [2021-11-12 22:27:26,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2287 states, 1757 states have (on average 1.3540125213431986) internal successors, (2379), 1770 states have internal predecessors, (2379), 391 states have call successors, (391), 139 states have call predecessors, (391), 138 states have return successors, (388), 381 states have call predecessors, (388), 375 states have call successors, (388) [2021-11-12 22:27:26,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2287 states to 2287 states and 3158 transitions. [2021-11-12 22:27:26,292 INFO L78 Accepts]: Start accepts. Automaton has 2287 states and 3158 transitions. Word has length 311 [2021-11-12 22:27:26,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:27:26,293 INFO L470 AbstractCegarLoop]: Abstraction has 2287 states and 3158 transitions. [2021-11-12 22:27:26,293 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 26.166666666666668) internal successors, (157), 5 states have internal predecessors, (157), 3 states have call successors, (38), 2 states have call predecessors, (38), 3 states have return successors, (37), 4 states have call predecessors, (37), 3 states have call successors, (37) [2021-11-12 22:27:26,294 INFO L276 IsEmpty]: Start isEmpty. Operand 2287 states and 3158 transitions. [2021-11-12 22:27:26,300 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 320 [2021-11-12 22:27:26,301 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:27:26,301 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:27:26,320 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (45)] Forceful destruction successful, exit code 0 [2021-11-12 22:27:26,565 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (44)] Forceful destruction successful, exit code 0 [2021-11-12 22:27:26,717 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 22:27:26,717 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:27:26,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:27:26,717 INFO L85 PathProgramCache]: Analyzing trace with hash -247252647, now seen corresponding path program 1 times [2021-11-12 22:27:26,720 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:27:26,720 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [479310797] [2021-11-12 22:27:26,721 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:27:26,721 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:27:26,721 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:27:26,722 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:27:26,739 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (46)] Waiting until timeout for monitored process [2021-11-12 22:27:31,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:27:31,327 INFO L263 TraceCheckSpWp]: Trace formula consists of 1952 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 22:27:31,331 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:27:32,622 INFO L134 CoverageAnalysis]: Checked inductivity of 415 backedges. 112 proven. 1 refuted. 0 times theorem prover too weak. 302 trivial. 0 not checked. [2021-11-12 22:27:32,622 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:27:34,062 INFO L134 CoverageAnalysis]: Checked inductivity of 415 backedges. 0 proven. 71 refuted. 0 times theorem prover too weak. 344 trivial. 0 not checked. [2021-11-12 22:27:34,063 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:27:34,063 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [479310797] [2021-11-12 22:27:34,063 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [479310797] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:27:34,063 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2117891669] [2021-11-12 22:27:34,063 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:27:34,063 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:27:34,063 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:27:34,064 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:27:34,065 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (47)] Waiting until timeout for monitored process [2021-11-12 22:27:36,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:27:36,194 INFO L263 TraceCheckSpWp]: Trace formula consists of 1952 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-12 22:27:36,198 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:27:37,200 INFO L134 CoverageAnalysis]: Checked inductivity of 415 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 401 trivial. 0 not checked. [2021-11-12 22:27:37,200 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:27:37,961 INFO L134 CoverageAnalysis]: Checked inductivity of 415 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 404 trivial. 0 not checked. [2021-11-12 22:27:37,961 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2117891669] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 22:27:37,962 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 22:27:37,962 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [7, 7] total 15 [2021-11-12 22:27:37,962 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [724426316] [2021-11-12 22:27:37,962 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 22:27:37,963 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-12 22:27:37,963 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:27:37,963 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-12 22:27:37,964 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=174, Unknown=0, NotChecked=0, Total=210 [2021-11-12 22:27:37,964 INFO L87 Difference]: Start difference. First operand 2287 states and 3158 transitions. Second operand has 6 states, 6 states have (on average 28.333333333333332) internal successors, (170), 5 states have internal predecessors, (170), 3 states have call successors, (37), 2 states have call predecessors, (37), 3 states have return successors, (36), 4 states have call predecessors, (36), 3 states have call successors, (36) [2021-11-12 22:27:38,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:27:38,241 INFO L93 Difference]: Finished difference Result 2975 states and 4080 transitions. [2021-11-12 22:27:38,242 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-12 22:27:38,242 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 28.333333333333332) internal successors, (170), 5 states have internal predecessors, (170), 3 states have call successors, (37), 2 states have call predecessors, (37), 3 states have return successors, (36), 4 states have call predecessors, (36), 3 states have call successors, (36) Word has length 319 [2021-11-12 22:27:38,243 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:27:38,248 INFO L225 Difference]: With dead ends: 2975 [2021-11-12 22:27:38,249 INFO L226 Difference]: Without dead ends: 2287 [2021-11-12 22:27:38,251 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1273 GetRequests, 1259 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=40, Invalid=200, Unknown=0, NotChecked=0, Total=240 [2021-11-12 22:27:38,252 INFO L933 BasicCegarLoop]: 1856 mSDtfsCounter, 13 mSDsluCounter, 7394 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 90.61ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 9250 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 9.52ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 100.26ms IncrementalHoareTripleChecker+Time [2021-11-12 22:27:38,252 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 9250 Invalid, 21 Unknown, 0 Unchecked, 9.52ms Time], IncrementalHoareTripleChecker [0 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 100.26ms Time] [2021-11-12 22:27:38,256 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2287 states. [2021-11-12 22:27:38,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2287 to 2287. [2021-11-12 22:27:38,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2287 states, 1757 states have (on average 1.3534433693796244) internal successors, (2378), 1770 states have internal predecessors, (2378), 391 states have call successors, (391), 139 states have call predecessors, (391), 138 states have return successors, (388), 381 states have call predecessors, (388), 375 states have call successors, (388) [2021-11-12 22:27:38,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2287 states to 2287 states and 3157 transitions. [2021-11-12 22:27:38,476 INFO L78 Accepts]: Start accepts. Automaton has 2287 states and 3157 transitions. Word has length 319 [2021-11-12 22:27:38,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:27:38,477 INFO L470 AbstractCegarLoop]: Abstraction has 2287 states and 3157 transitions. [2021-11-12 22:27:38,477 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 28.333333333333332) internal successors, (170), 5 states have internal predecessors, (170), 3 states have call successors, (37), 2 states have call predecessors, (37), 3 states have return successors, (36), 4 states have call predecessors, (36), 3 states have call successors, (36) [2021-11-12 22:27:38,477 INFO L276 IsEmpty]: Start isEmpty. Operand 2287 states and 3157 transitions. [2021-11-12 22:27:38,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 321 [2021-11-12 22:27:38,486 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:27:38,487 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:27:38,541 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (46)] Forceful destruction successful, exit code 0 [2021-11-12 22:27:38,732 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (47)] Forceful destruction successful, exit code 0 [2021-11-12 22:27:38,911 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 22:27:38,911 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:27:38,912 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:27:38,912 INFO L85 PathProgramCache]: Analyzing trace with hash -1904040409, now seen corresponding path program 1 times [2021-11-12 22:27:38,916 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:27:38,916 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1498068103] [2021-11-12 22:27:38,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:27:38,917 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:27:38,917 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:27:38,918 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:27:38,959 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (48)] Waiting until timeout for monitored process [2021-11-12 22:27:44,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:27:44,241 INFO L263 TraceCheckSpWp]: Trace formula consists of 1952 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 22:27:44,246 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:27:45,794 INFO L134 CoverageAnalysis]: Checked inductivity of 415 backedges. 112 proven. 1 refuted. 0 times theorem prover too weak. 302 trivial. 0 not checked. [2021-11-12 22:27:45,794 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:27:47,602 INFO L134 CoverageAnalysis]: Checked inductivity of 415 backedges. 0 proven. 71 refuted. 0 times theorem prover too weak. 344 trivial. 0 not checked. [2021-11-12 22:27:47,602 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:27:47,602 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1498068103] [2021-11-12 22:27:47,602 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1498068103] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:27:47,602 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1008203211] [2021-11-12 22:27:47,602 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:27:47,602 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:27:47,603 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:27:47,603 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:27:47,605 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (49)] Waiting until timeout for monitored process [2021-11-12 22:27:49,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:27:49,654 INFO L263 TraceCheckSpWp]: Trace formula consists of 1952 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-12 22:27:49,658 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:27:50,612 INFO L134 CoverageAnalysis]: Checked inductivity of 415 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 401 trivial. 0 not checked. [2021-11-12 22:27:50,612 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:27:51,386 INFO L134 CoverageAnalysis]: Checked inductivity of 415 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 404 trivial. 0 not checked. [2021-11-12 22:27:51,386 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1008203211] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 22:27:51,386 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 22:27:51,387 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [7, 7] total 15 [2021-11-12 22:27:51,387 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [133977025] [2021-11-12 22:27:51,387 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 22:27:51,387 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-12 22:27:51,388 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:27:51,388 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-12 22:27:51,388 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=174, Unknown=0, NotChecked=0, Total=210 [2021-11-12 22:27:51,388 INFO L87 Difference]: Start difference. First operand 2287 states and 3157 transitions. Second operand has 6 states, 6 states have (on average 28.5) internal successors, (171), 5 states have internal predecessors, (171), 3 states have call successors, (37), 2 states have call predecessors, (37), 3 states have return successors, (36), 4 states have call predecessors, (36), 3 states have call successors, (36) [2021-11-12 22:27:51,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:27:51,631 INFO L93 Difference]: Finished difference Result 2975 states and 4079 transitions. [2021-11-12 22:27:51,631 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-12 22:27:51,631 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 28.5) internal successors, (171), 5 states have internal predecessors, (171), 3 states have call successors, (37), 2 states have call predecessors, (37), 3 states have return successors, (36), 4 states have call predecessors, (36), 3 states have call successors, (36) Word has length 320 [2021-11-12 22:27:51,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:27:51,640 INFO L225 Difference]: With dead ends: 2975 [2021-11-12 22:27:51,640 INFO L226 Difference]: Without dead ends: 2287 [2021-11-12 22:27:51,643 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1277 GetRequests, 1263 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=40, Invalid=200, Unknown=0, NotChecked=0, Total=240 [2021-11-12 22:27:51,644 INFO L933 BasicCegarLoop]: 1856 mSDtfsCounter, 14 mSDsluCounter, 7393 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 83.96ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 9249 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 8.54ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 92.86ms IncrementalHoareTripleChecker+Time [2021-11-12 22:27:51,644 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 9249 Invalid, 21 Unknown, 0 Unchecked, 8.54ms Time], IncrementalHoareTripleChecker [0 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 92.86ms Time] [2021-11-12 22:27:51,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2287 states. [2021-11-12 22:27:51,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2287 to 2287. [2021-11-12 22:27:51,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2287 states, 1757 states have (on average 1.3528742174160502) internal successors, (2377), 1770 states have internal predecessors, (2377), 391 states have call successors, (391), 139 states have call predecessors, (391), 138 states have return successors, (388), 381 states have call predecessors, (388), 375 states have call successors, (388) [2021-11-12 22:27:51,789 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2287 states to 2287 states and 3156 transitions. [2021-11-12 22:27:51,789 INFO L78 Accepts]: Start accepts. Automaton has 2287 states and 3156 transitions. Word has length 320 [2021-11-12 22:27:51,790 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:27:51,790 INFO L470 AbstractCegarLoop]: Abstraction has 2287 states and 3156 transitions. [2021-11-12 22:27:51,791 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 28.5) internal successors, (171), 5 states have internal predecessors, (171), 3 states have call successors, (37), 2 states have call predecessors, (37), 3 states have return successors, (36), 4 states have call predecessors, (36), 3 states have call successors, (36) [2021-11-12 22:27:51,791 INFO L276 IsEmpty]: Start isEmpty. Operand 2287 states and 3156 transitions. [2021-11-12 22:27:51,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 328 [2021-11-12 22:27:51,798 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:27:51,799 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:27:51,817 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (49)] Forceful destruction successful, exit code 0 [2021-11-12 22:27:52,068 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (48)] Forceful destruction successful, exit code 0 [2021-11-12 22:27:52,215 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt,48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 22:27:52,215 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:27:52,216 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:27:52,216 INFO L85 PathProgramCache]: Analyzing trace with hash -674785419, now seen corresponding path program 1 times [2021-11-12 22:27:52,276 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:27:52,276 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1326819452] [2021-11-12 22:27:52,276 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:27:52,277 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:27:52,277 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:27:52,277 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:27:52,279 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (50)] Waiting until timeout for monitored process [2021-11-12 22:27:57,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:27:57,470 INFO L263 TraceCheckSpWp]: Trace formula consists of 1962 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 22:27:57,475 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:27:58,909 INFO L134 CoverageAnalysis]: Checked inductivity of 415 backedges. 112 proven. 1 refuted. 0 times theorem prover too weak. 302 trivial. 0 not checked. [2021-11-12 22:27:58,909 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:28:00,669 INFO L134 CoverageAnalysis]: Checked inductivity of 415 backedges. 0 proven. 71 refuted. 0 times theorem prover too weak. 344 trivial. 0 not checked. [2021-11-12 22:28:00,670 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:28:00,670 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1326819452] [2021-11-12 22:28:00,670 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1326819452] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:28:00,670 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [313210996] [2021-11-12 22:28:00,671 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:28:00,671 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:28:00,671 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:28:00,673 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:28:00,675 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (51)] Waiting until timeout for monitored process [2021-11-12 22:28:02,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:28:03,016 INFO L263 TraceCheckSpWp]: Trace formula consists of 1962 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-12 22:28:03,020 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:28:03,903 INFO L134 CoverageAnalysis]: Checked inductivity of 415 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 401 trivial. 0 not checked. [2021-11-12 22:28:03,903 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:28:05,055 INFO L134 CoverageAnalysis]: Checked inductivity of 415 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 404 trivial. 0 not checked. [2021-11-12 22:28:05,056 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [313210996] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 22:28:05,056 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 22:28:05,056 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [7, 7] total 19 [2021-11-12 22:28:05,057 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2054947686] [2021-11-12 22:28:05,057 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 22:28:05,058 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-12 22:28:05,058 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:28:05,059 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-12 22:28:05,059 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=294, Unknown=0, NotChecked=0, Total=342 [2021-11-12 22:28:05,059 INFO L87 Difference]: Start difference. First operand 2287 states and 3156 transitions. Second operand has 10 states, 10 states have (on average 17.9) internal successors, (179), 8 states have internal predecessors, (179), 2 states have call successors, (39), 2 states have call predecessors, (39), 4 states have return successors, (39), 4 states have call predecessors, (39), 2 states have call successors, (39) [2021-11-12 22:28:05,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:28:05,324 INFO L93 Difference]: Finished difference Result 2359 states and 3229 transitions. [2021-11-12 22:28:05,325 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-12 22:28:05,325 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 17.9) internal successors, (179), 8 states have internal predecessors, (179), 2 states have call successors, (39), 2 states have call predecessors, (39), 4 states have return successors, (39), 4 states have call predecessors, (39), 2 states have call successors, (39) Word has length 327 [2021-11-12 22:28:05,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:28:05,332 INFO L225 Difference]: With dead ends: 2359 [2021-11-12 22:28:05,333 INFO L226 Difference]: Without dead ends: 1662 [2021-11-12 22:28:05,335 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1305 GetRequests, 1287 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2021-11-12 22:28:05,336 INFO L933 BasicCegarLoop]: 1838 mSDtfsCounter, 10 mSDsluCounter, 12839 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 95.54ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 14677 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 13.77ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 101.71ms IncrementalHoareTripleChecker+Time [2021-11-12 22:28:05,337 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 14677 Invalid, 31 Unknown, 0 Unchecked, 13.77ms Time], IncrementalHoareTripleChecker [0 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 101.71ms Time] [2021-11-12 22:28:05,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1662 states. [2021-11-12 22:28:05,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1662 to 1659. [2021-11-12 22:28:05,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1659 states, 1267 states have (on average 1.3535911602209945) internal successors, (1715), 1275 states have internal predecessors, (1715), 288 states have call successors, (288), 104 states have call predecessors, (288), 103 states have return successors, (285), 283 states have call predecessors, (285), 279 states have call successors, (285) [2021-11-12 22:28:05,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1659 states to 1659 states and 2288 transitions. [2021-11-12 22:28:05,435 INFO L78 Accepts]: Start accepts. Automaton has 1659 states and 2288 transitions. Word has length 327 [2021-11-12 22:28:05,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:28:05,435 INFO L470 AbstractCegarLoop]: Abstraction has 1659 states and 2288 transitions. [2021-11-12 22:28:05,436 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 17.9) internal successors, (179), 8 states have internal predecessors, (179), 2 states have call successors, (39), 2 states have call predecessors, (39), 4 states have return successors, (39), 4 states have call predecessors, (39), 2 states have call successors, (39) [2021-11-12 22:28:05,436 INFO L276 IsEmpty]: Start isEmpty. Operand 1659 states and 2288 transitions. [2021-11-12 22:28:05,443 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 389 [2021-11-12 22:28:05,443 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:28:05,444 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:28:05,493 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (50)] Forceful destruction successful, exit code 0 [2021-11-12 22:28:05,687 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (51)] Forceful destruction successful, exit code 0 [2021-11-12 22:28:05,867 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 22:28:05,867 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:28:05,867 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:28:05,868 INFO L85 PathProgramCache]: Analyzing trace with hash 2130032382, now seen corresponding path program 1 times [2021-11-12 22:28:05,872 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:28:05,872 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [707228176] [2021-11-12 22:28:05,872 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:28:05,873 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:28:05,873 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:28:05,874 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:28:05,896 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (52)] Waiting until timeout for monitored process [2021-11-12 22:28:11,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:28:12,043 INFO L263 TraceCheckSpWp]: Trace formula consists of 2297 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 22:28:12,048 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:28:13,808 INFO L134 CoverageAnalysis]: Checked inductivity of 456 backedges. 112 proven. 1 refuted. 0 times theorem prover too weak. 343 trivial. 0 not checked. [2021-11-12 22:28:13,808 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:28:15,621 INFO L134 CoverageAnalysis]: Checked inductivity of 456 backedges. 0 proven. 71 refuted. 0 times theorem prover too weak. 385 trivial. 0 not checked. [2021-11-12 22:28:15,622 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:28:15,622 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [707228176] [2021-11-12 22:28:15,622 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [707228176] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:28:15,622 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [365359063] [2021-11-12 22:28:15,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:28:15,623 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:28:15,623 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:28:15,623 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:28:15,625 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (53)] Waiting until timeout for monitored process [2021-11-12 22:28:17,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:28:17,916 INFO L263 TraceCheckSpWp]: Trace formula consists of 2297 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 22:28:17,924 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:28:18,805 INFO L134 CoverageAnalysis]: Checked inductivity of 456 backedges. 40 proven. 0 refuted. 0 times theorem prover too weak. 416 trivial. 0 not checked. [2021-11-12 22:28:18,805 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:28:19,611 INFO L134 CoverageAnalysis]: Checked inductivity of 456 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 456 trivial. 0 not checked. [2021-11-12 22:28:19,612 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [365359063] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 22:28:19,612 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 22:28:19,612 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [7, 7] total 12 [2021-11-12 22:28:19,613 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [146315397] [2021-11-12 22:28:19,613 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 22:28:19,614 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 22:28:19,614 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:28:19,614 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 22:28:19,615 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-11-12 22:28:19,615 INFO L87 Difference]: Start difference. First operand 1659 states and 2288 transitions. Second operand has 3 states, 3 states have (on average 70.66666666666667) internal successors, (212), 3 states have internal predecessors, (212), 2 states have call successors, (46), 2 states have call predecessors, (46), 2 states have return successors, (42), 2 states have call predecessors, (42), 2 states have call successors, (42) [2021-11-12 22:28:19,740 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:28:19,740 INFO L93 Difference]: Finished difference Result 3278 states and 4530 transitions. [2021-11-12 22:28:19,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 22:28:19,748 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 70.66666666666667) internal successors, (212), 3 states have internal predecessors, (212), 2 states have call successors, (46), 2 states have call predecessors, (46), 2 states have return successors, (42), 2 states have call predecessors, (42), 2 states have call successors, (42) Word has length 388 [2021-11-12 22:28:19,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:28:19,753 INFO L225 Difference]: With dead ends: 3278 [2021-11-12 22:28:19,754 INFO L226 Difference]: Without dead ends: 1660 [2021-11-12 22:28:19,757 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1548 GetRequests, 1538 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-11-12 22:28:19,758 INFO L933 BasicCegarLoop]: 1831 mSDtfsCounter, 0 mSDsluCounter, 1826 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 57.40ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 3657 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.79ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 60.03ms IncrementalHoareTripleChecker+Time [2021-11-12 22:28:19,758 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 3657 Invalid, 6 Unknown, 0 Unchecked, 3.79ms Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 60.03ms Time] [2021-11-12 22:28:19,761 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1660 states. [2021-11-12 22:28:19,851 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1660 to 1660. [2021-11-12 22:28:19,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1660 states, 1268 states have (on average 1.3533123028391167) internal successors, (1716), 1276 states have internal predecessors, (1716), 288 states have call successors, (288), 104 states have call predecessors, (288), 103 states have return successors, (285), 283 states have call predecessors, (285), 279 states have call successors, (285) [2021-11-12 22:28:19,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1660 states to 1660 states and 2289 transitions. [2021-11-12 22:28:19,861 INFO L78 Accepts]: Start accepts. Automaton has 1660 states and 2289 transitions. Word has length 388 [2021-11-12 22:28:19,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:28:19,862 INFO L470 AbstractCegarLoop]: Abstraction has 1660 states and 2289 transitions. [2021-11-12 22:28:19,862 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 70.66666666666667) internal successors, (212), 3 states have internal predecessors, (212), 2 states have call successors, (46), 2 states have call predecessors, (46), 2 states have return successors, (42), 2 states have call predecessors, (42), 2 states have call successors, (42) [2021-11-12 22:28:19,862 INFO L276 IsEmpty]: Start isEmpty. Operand 1660 states and 2289 transitions. [2021-11-12 22:28:19,870 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 355 [2021-11-12 22:28:19,871 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:28:19,871 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:28:19,938 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (52)] Forceful destruction successful, exit code 0 [2021-11-12 22:28:20,102 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (53)] Forceful destruction successful, exit code 0 [2021-11-12 22:28:20,287 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 22:28:20,287 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:28:20,287 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:28:20,288 INFO L85 PathProgramCache]: Analyzing trace with hash -554107556, now seen corresponding path program 1 times [2021-11-12 22:28:20,291 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:28:20,291 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [452490077] [2021-11-12 22:28:20,291 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:28:20,291 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:28:20,291 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:28:20,292 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:28:20,294 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (54)] Waiting until timeout for monitored process [2021-11-12 22:28:25,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:28:26,116 INFO L263 TraceCheckSpWp]: Trace formula consists of 2222 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 22:28:26,121 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:28:27,849 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 112 proven. 1 refuted. 0 times theorem prover too weak. 307 trivial. 0 not checked. [2021-11-12 22:28:27,849 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:28:29,738 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 71 refuted. 0 times theorem prover too weak. 349 trivial. 0 not checked. [2021-11-12 22:28:29,738 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:28:29,738 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [452490077] [2021-11-12 22:28:29,738 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [452490077] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:28:29,739 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [385321165] [2021-11-12 22:28:29,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:28:29,739 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:28:29,739 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:28:29,743 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:28:29,744 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (55)] Waiting until timeout for monitored process [2021-11-12 22:28:32,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:28:32,379 INFO L263 TraceCheckSpWp]: Trace formula consists of 2222 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 22:28:32,387 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:28:33,197 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 19 proven. 0 refuted. 0 times theorem prover too weak. 401 trivial. 0 not checked. [2021-11-12 22:28:33,197 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:28:33,994 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2021-11-12 22:28:33,994 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [385321165] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 22:28:33,994 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 22:28:33,995 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [7, 7] total 12 [2021-11-12 22:28:33,995 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [818393523] [2021-11-12 22:28:33,995 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 22:28:33,996 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 22:28:33,997 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:28:33,997 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 22:28:33,997 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-11-12 22:28:33,998 INFO L87 Difference]: Start difference. First operand 1660 states and 2289 transitions. Second operand has 3 states, 3 states have (on average 65.66666666666667) internal successors, (197), 3 states have internal predecessors, (197), 2 states have call successors, (42), 2 states have call predecessors, (42), 2 states have return successors, (39), 2 states have call predecessors, (39), 2 states have call successors, (39) [2021-11-12 22:28:34,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:28:34,096 INFO L93 Difference]: Finished difference Result 3280 states and 4536 transitions. [2021-11-12 22:28:34,097 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 22:28:34,097 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 65.66666666666667) internal successors, (197), 3 states have internal predecessors, (197), 2 states have call successors, (42), 2 states have call predecessors, (42), 2 states have return successors, (39), 2 states have call predecessors, (39), 2 states have call successors, (39) Word has length 354 [2021-11-12 22:28:34,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:28:34,105 INFO L225 Difference]: With dead ends: 3280 [2021-11-12 22:28:34,105 INFO L226 Difference]: Without dead ends: 1661 [2021-11-12 22:28:34,111 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1412 GetRequests, 1402 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-11-12 22:28:34,112 INFO L933 BasicCegarLoop]: 1831 mSDtfsCounter, 0 mSDsluCounter, 1827 mSDsCounter, 0 mSdLazyCounter, 5 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 21.25ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 3658 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.34ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 5 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 23.12ms IncrementalHoareTripleChecker+Time [2021-11-12 22:28:34,112 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 3658 Invalid, 5 Unknown, 0 Unchecked, 4.34ms Time], IncrementalHoareTripleChecker [0 Valid, 5 Invalid, 0 Unknown, 0 Unchecked, 23.12ms Time] [2021-11-12 22:28:34,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1661 states. [2021-11-12 22:28:34,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1661 to 1661. [2021-11-12 22:28:34,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1661 states, 1269 states have (on average 1.3530338849487786) internal successors, (1717), 1277 states have internal predecessors, (1717), 288 states have call successors, (288), 104 states have call predecessors, (288), 103 states have return successors, (285), 283 states have call predecessors, (285), 279 states have call successors, (285) [2021-11-12 22:28:34,204 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1661 states to 1661 states and 2290 transitions. [2021-11-12 22:28:34,205 INFO L78 Accepts]: Start accepts. Automaton has 1661 states and 2290 transitions. Word has length 354 [2021-11-12 22:28:34,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:28:34,206 INFO L470 AbstractCegarLoop]: Abstraction has 1661 states and 2290 transitions. [2021-11-12 22:28:34,206 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 65.66666666666667) internal successors, (197), 3 states have internal predecessors, (197), 2 states have call successors, (42), 2 states have call predecessors, (42), 2 states have return successors, (39), 2 states have call predecessors, (39), 2 states have call successors, (39) [2021-11-12 22:28:34,206 INFO L276 IsEmpty]: Start isEmpty. Operand 1661 states and 2290 transitions. [2021-11-12 22:28:34,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 389 [2021-11-12 22:28:34,214 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:28:34,215 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:28:34,276 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (54)] Forceful destruction successful, exit code 0 [2021-11-12 22:28:34,449 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (55)] Forceful destruction successful, exit code 0 [2021-11-12 22:28:34,631 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 22:28:34,631 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:28:34,632 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:28:34,632 INFO L85 PathProgramCache]: Analyzing trace with hash 47144126, now seen corresponding path program 1 times [2021-11-12 22:28:34,636 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:28:34,636 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1942933931] [2021-11-12 22:28:34,636 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:28:34,637 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:28:34,637 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:28:34,638 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:28:34,639 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (56)] Waiting until timeout for monitored process [2021-11-12 22:28:39,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:28:39,938 INFO L263 TraceCheckSpWp]: Trace formula consists of 2303 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 22:28:39,942 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:28:41,494 INFO L134 CoverageAnalysis]: Checked inductivity of 456 backedges. 112 proven. 1 refuted. 0 times theorem prover too weak. 343 trivial. 0 not checked. [2021-11-12 22:28:41,494 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:28:43,223 INFO L134 CoverageAnalysis]: Checked inductivity of 456 backedges. 0 proven. 71 refuted. 0 times theorem prover too weak. 385 trivial. 0 not checked. [2021-11-12 22:28:43,223 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:28:43,223 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1942933931] [2021-11-12 22:28:43,224 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1942933931] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:28:43,224 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [515249332] [2021-11-12 22:28:43,224 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:28:43,224 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:28:43,224 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:28:43,226 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:28:43,227 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (57)] Waiting until timeout for monitored process [2021-11-12 22:28:45,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:28:45,330 INFO L263 TraceCheckSpWp]: Trace formula consists of 2303 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-12 22:28:45,335 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:28:46,679 INFO L134 CoverageAnalysis]: Checked inductivity of 456 backedges. 40 proven. 0 refuted. 0 times theorem prover too weak. 416 trivial. 0 not checked. [2021-11-12 22:28:46,679 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:28:48,003 INFO L134 CoverageAnalysis]: Checked inductivity of 456 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 456 trivial. 0 not checked. [2021-11-12 22:28:48,004 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [515249332] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 22:28:48,004 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 22:28:48,004 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [7, 7] total 19 [2021-11-12 22:28:48,004 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1916145568] [2021-11-12 22:28:48,005 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 22:28:48,006 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-12 22:28:48,006 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:28:48,006 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-12 22:28:48,007 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2021-11-12 22:28:48,007 INFO L87 Difference]: Start difference. First operand 1661 states and 2290 transitions. Second operand has 10 states, 10 states have (on average 25.2) internal successors, (252), 8 states have internal predecessors, (252), 6 states have call successors, (52), 4 states have call predecessors, (52), 2 states have return successors, (47), 4 states have call predecessors, (47), 4 states have call successors, (47) [2021-11-12 22:28:52,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:28:52,693 INFO L93 Difference]: Finished difference Result 4110 states and 5802 transitions. [2021-11-12 22:28:52,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-12 22:28:52,694 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 25.2) internal successors, (252), 8 states have internal predecessors, (252), 6 states have call successors, (52), 4 states have call predecessors, (52), 2 states have return successors, (47), 4 states have call predecessors, (47), 4 states have call successors, (47) Word has length 388 [2021-11-12 22:28:52,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:28:52,705 INFO L225 Difference]: With dead ends: 4110 [2021-11-12 22:28:52,705 INFO L226 Difference]: Without dead ends: 2490 [2021-11-12 22:28:52,711 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1552 GetRequests, 1532 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=67, Invalid=395, Unknown=0, NotChecked=0, Total=462 [2021-11-12 22:28:52,712 INFO L933 BasicCegarLoop]: 2078 mSDtfsCounter, 2127 mSDsluCounter, 7940 mSDsCounter, 0 mSdLazyCounter, 655 mSolverCounterSat, 344 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3637.28ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 2235 SdHoareTripleChecker+Valid, 10018 SdHoareTripleChecker+Invalid, 999 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 30.57ms SdHoareTripleChecker+Time, 344 IncrementalHoareTripleChecker+Valid, 655 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4047.08ms IncrementalHoareTripleChecker+Time [2021-11-12 22:28:52,713 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2235 Valid, 10018 Invalid, 999 Unknown, 0 Unchecked, 30.57ms Time], IncrementalHoareTripleChecker [344 Valid, 655 Invalid, 0 Unknown, 0 Unchecked, 4047.08ms Time] [2021-11-12 22:28:52,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2490 states. [2021-11-12 22:28:52,829 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2490 to 2117. [2021-11-12 22:28:52,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2117 states, 1628 states have (on average 1.378992628992629) internal successors, (2245), 1636 states have internal predecessors, (2245), 383 states have call successors, (383), 106 states have call predecessors, (383), 105 states have return successors, (381), 378 states have call predecessors, (381), 374 states have call successors, (381) [2021-11-12 22:28:52,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2117 states to 2117 states and 3009 transitions. [2021-11-12 22:28:52,842 INFO L78 Accepts]: Start accepts. Automaton has 2117 states and 3009 transitions. Word has length 388 [2021-11-12 22:28:52,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:28:52,843 INFO L470 AbstractCegarLoop]: Abstraction has 2117 states and 3009 transitions. [2021-11-12 22:28:52,844 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 25.2) internal successors, (252), 8 states have internal predecessors, (252), 6 states have call successors, (52), 4 states have call predecessors, (52), 2 states have return successors, (47), 4 states have call predecessors, (47), 4 states have call successors, (47) [2021-11-12 22:28:52,844 INFO L276 IsEmpty]: Start isEmpty. Operand 2117 states and 3009 transitions. [2021-11-12 22:28:52,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 371 [2021-11-12 22:28:52,855 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:28:52,855 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:28:52,925 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (56)] Forceful destruction successful, exit code 0 [2021-11-12 22:28:53,097 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (57)] Forceful destruction successful, exit code 0 [2021-11-12 22:28:53,279 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 22:28:53,279 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:28:53,280 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:28:53,280 INFO L85 PathProgramCache]: Analyzing trace with hash 1859756508, now seen corresponding path program 1 times [2021-11-12 22:28:53,283 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:28:53,283 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1503505537] [2021-11-12 22:28:53,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:28:53,284 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:28:53,284 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:28:53,285 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:28:53,286 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (58)] Waiting until timeout for monitored process [2021-11-12 22:28:59,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:28:59,276 INFO L263 TraceCheckSpWp]: Trace formula consists of 2288 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 22:28:59,281 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:29:01,043 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 112 proven. 1 refuted. 0 times theorem prover too weak. 346 trivial. 0 not checked. [2021-11-12 22:29:01,043 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:29:02,744 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 0 proven. 71 refuted. 0 times theorem prover too weak. 388 trivial. 0 not checked. [2021-11-12 22:29:02,745 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:29:02,745 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1503505537] [2021-11-12 22:29:02,745 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1503505537] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:29:02,745 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [771429083] [2021-11-12 22:29:02,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:29:02,745 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:29:02,746 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:29:02,746 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:29:02,748 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (59)] Waiting until timeout for monitored process [2021-11-12 22:29:05,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:29:05,316 INFO L263 TraceCheckSpWp]: Trace formula consists of 2288 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-12 22:29:05,321 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:29:06,639 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 32 proven. 0 refuted. 0 times theorem prover too weak. 427 trivial. 0 not checked. [2021-11-12 22:29:06,639 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:29:08,855 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 457 trivial. 0 not checked. [2021-11-12 22:29:08,855 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [771429083] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 22:29:08,856 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 22:29:08,856 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7, 7] imperfect sequences [7, 7] total 21 [2021-11-12 22:29:08,856 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1140333192] [2021-11-12 22:29:08,857 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 22:29:08,858 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-12 22:29:08,858 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:29:08,858 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-12 22:29:08,858 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=367, Unknown=0, NotChecked=0, Total=420 [2021-11-12 22:29:08,859 INFO L87 Difference]: Start difference. First operand 2117 states and 3009 transitions. Second operand has 12 states, 12 states have (on average 15.333333333333334) internal successors, (184), 8 states have internal predecessors, (184), 2 states have call successors, (40), 2 states have call predecessors, (40), 6 states have return successors, (38), 6 states have call predecessors, (38), 2 states have call successors, (38) [2021-11-12 22:29:09,585 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:29:09,585 INFO L93 Difference]: Finished difference Result 4236 states and 6042 transitions. [2021-11-12 22:29:09,585 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-12 22:29:09,586 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 15.333333333333334) internal successors, (184), 8 states have internal predecessors, (184), 2 states have call successors, (40), 2 states have call predecessors, (40), 6 states have return successors, (38), 6 states have call predecessors, (38), 2 states have call successors, (38) Word has length 370 [2021-11-12 22:29:09,586 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:29:09,593 INFO L225 Difference]: With dead ends: 4236 [2021-11-12 22:29:09,593 INFO L226 Difference]: Without dead ends: 2160 [2021-11-12 22:29:09,600 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1477 GetRequests, 1457 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=59, Invalid=403, Unknown=0, NotChecked=0, Total=462 [2021-11-12 22:29:09,601 INFO L933 BasicCegarLoop]: 1842 mSDtfsCounter, 136 mSDsluCounter, 12807 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 379.54ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 148 SdHoareTripleChecker+Valid, 14649 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 20.06ms SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 442.36ms IncrementalHoareTripleChecker+Time [2021-11-12 22:29:09,601 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [148 Valid, 14649 Invalid, 62 Unknown, 0 Unchecked, 20.06ms Time], IncrementalHoareTripleChecker [21 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 442.36ms Time] [2021-11-12 22:29:09,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2160 states. [2021-11-12 22:29:09,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2160 to 2142. [2021-11-12 22:29:09,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2142 states, 1647 states have (on average 1.3770491803278688) internal successors, (2268), 1655 states have internal predecessors, (2268), 387 states have call successors, (387), 106 states have call predecessors, (387), 107 states have return successors, (394), 384 states have call predecessors, (394), 378 states have call successors, (394) [2021-11-12 22:29:09,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2142 states to 2142 states and 3049 transitions. [2021-11-12 22:29:09,705 INFO L78 Accepts]: Start accepts. Automaton has 2142 states and 3049 transitions. Word has length 370 [2021-11-12 22:29:09,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:29:09,706 INFO L470 AbstractCegarLoop]: Abstraction has 2142 states and 3049 transitions. [2021-11-12 22:29:09,706 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 15.333333333333334) internal successors, (184), 8 states have internal predecessors, (184), 2 states have call successors, (40), 2 states have call predecessors, (40), 6 states have return successors, (38), 6 states have call predecessors, (38), 2 states have call successors, (38) [2021-11-12 22:29:09,706 INFO L276 IsEmpty]: Start isEmpty. Operand 2142 states and 3049 transitions. [2021-11-12 22:29:09,715 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 391 [2021-11-12 22:29:09,715 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:29:09,715 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 5, 5, 5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:29:09,777 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (58)] Forceful destruction successful, exit code 0 [2021-11-12 22:29:09,955 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (59)] Forceful destruction successful, exit code 0 [2021-11-12 22:29:10,133 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 22:29:10,134 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:29:10,134 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:29:10,134 INFO L85 PathProgramCache]: Analyzing trace with hash 1181200694, now seen corresponding path program 1 times [2021-11-12 22:29:10,140 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:29:10,149 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [307185952] [2021-11-12 22:29:10,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:29:10,150 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:29:10,150 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:29:10,153 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:29:10,154 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (60)] Waiting until timeout for monitored process [2021-11-12 22:29:16,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:29:16,794 INFO L263 TraceCheckSpWp]: Trace formula consists of 2329 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 22:29:16,800 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:29:18,696 INFO L134 CoverageAnalysis]: Checked inductivity of 487 backedges. 120 proven. 1 refuted. 0 times theorem prover too weak. 366 trivial. 0 not checked. [2021-11-12 22:29:18,697 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:29:20,636 INFO L134 CoverageAnalysis]: Checked inductivity of 487 backedges. 0 proven. 71 refuted. 0 times theorem prover too weak. 416 trivial. 0 not checked. [2021-11-12 22:29:20,637 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:29:20,637 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [307185952] [2021-11-12 22:29:20,637 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [307185952] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:29:20,637 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1441810027] [2021-11-12 22:29:20,637 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:29:20,637 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:29:20,637 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:29:20,638 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:29:20,640 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (61)] Waiting until timeout for monitored process [2021-11-12 22:29:25,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:29:25,274 INFO L263 TraceCheckSpWp]: Trace formula consists of 2329 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 22:29:25,279 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:29:26,802 INFO L134 CoverageAnalysis]: Checked inductivity of 487 backedges. 120 proven. 1 refuted. 0 times theorem prover too weak. 366 trivial. 0 not checked. [2021-11-12 22:29:26,802 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:29:28,348 INFO L134 CoverageAnalysis]: Checked inductivity of 487 backedges. 0 proven. 71 refuted. 0 times theorem prover too weak. 416 trivial. 0 not checked. [2021-11-12 22:29:28,348 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1441810027] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:29:28,348 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1031952324] [2021-11-12 22:29:28,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:29:28,348 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:29:28,349 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:29:28,350 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:29:28,350 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Waiting until timeout for monitored process [2021-11-12 22:29:29,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:29:29,783 INFO L263 TraceCheckSpWp]: Trace formula consists of 2329 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-12 22:29:29,789 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:29:31,112 INFO L134 CoverageAnalysis]: Checked inductivity of 487 backedges. 30 proven. 0 refuted. 0 times theorem prover too weak. 457 trivial. 0 not checked. [2021-11-12 22:29:31,112 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:29:32,372 INFO L134 CoverageAnalysis]: Checked inductivity of 487 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 481 trivial. 0 not checked. [2021-11-12 22:29:32,372 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1031952324] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 22:29:32,372 INFO L186 FreeRefinementEngine]: Found 2 perfect and 4 imperfect interpolant sequences. [2021-11-12 22:29:32,373 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [7, 7, 7, 7] total 17 [2021-11-12 22:29:32,373 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [728127581] [2021-11-12 22:29:32,373 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 22:29:32,374 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-12 22:29:32,374 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:29:32,374 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-12 22:29:32,374 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=229, Unknown=0, NotChecked=0, Total=272 [2021-11-12 22:29:32,375 INFO L87 Difference]: Start difference. First operand 2142 states and 3049 transitions. Second operand has 8 states, 8 states have (on average 29.125) internal successors, (233), 8 states have internal predecessors, (233), 4 states have call successors, (64), 2 states have call predecessors, (64), 2 states have return successors, (60), 4 states have call predecessors, (60), 4 states have call successors, (60) [2021-11-12 22:29:34,595 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.22s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 22:29:35,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:29:35,129 INFO L93 Difference]: Finished difference Result 4225 states and 6027 transitions. [2021-11-12 22:29:35,129 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-12 22:29:35,129 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 29.125) internal successors, (233), 8 states have internal predecessors, (233), 4 states have call successors, (64), 2 states have call predecessors, (64), 2 states have return successors, (60), 4 states have call predecessors, (60), 4 states have call successors, (60) Word has length 390 [2021-11-12 22:29:35,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:29:35,136 INFO L225 Difference]: With dead ends: 4225 [2021-11-12 22:29:35,136 INFO L226 Difference]: Without dead ends: 2096 [2021-11-12 22:29:35,140 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2336 GetRequests, 2319 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=58, Invalid=284, Unknown=0, NotChecked=0, Total=342 [2021-11-12 22:29:35,141 INFO L933 BasicCegarLoop]: 1830 mSDtfsCounter, 5 mSDsluCounter, 7307 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 4 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2272.11ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 9137 SdHoareTripleChecker+Invalid, 20 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 12.13ms SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2350.80ms IncrementalHoareTripleChecker+Time [2021-11-12 22:29:35,142 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 9137 Invalid, 20 Unknown, 0 Unchecked, 12.13ms Time], IncrementalHoareTripleChecker [4 Valid, 15 Invalid, 1 Unknown, 0 Unchecked, 2350.80ms Time] [2021-11-12 22:29:35,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2096 states. [2021-11-12 22:29:35,271 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2096 to 2096. [2021-11-12 22:29:35,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2096 states, 1618 states have (on average 1.381334981458591) internal successors, (2235), 1626 states have internal predecessors, (2235), 377 states have call successors, (377), 99 states have call predecessors, (377), 100 states have return successors, (384), 374 states have call predecessors, (384), 368 states have call successors, (384) [2021-11-12 22:29:35,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2096 states to 2096 states and 2996 transitions. [2021-11-12 22:29:35,284 INFO L78 Accepts]: Start accepts. Automaton has 2096 states and 2996 transitions. Word has length 390 [2021-11-12 22:29:35,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:29:35,285 INFO L470 AbstractCegarLoop]: Abstraction has 2096 states and 2996 transitions. [2021-11-12 22:29:35,285 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 29.125) internal successors, (233), 8 states have internal predecessors, (233), 4 states have call successors, (64), 2 states have call predecessors, (64), 2 states have return successors, (60), 4 states have call predecessors, (60), 4 states have call successors, (60) [2021-11-12 22:29:35,286 INFO L276 IsEmpty]: Start isEmpty. Operand 2096 states and 2996 transitions. [2021-11-12 22:29:35,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 400 [2021-11-12 22:29:35,296 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:29:35,297 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 5, 5, 5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:29:35,329 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (61)] Forceful destruction successful, exit code 0 [2021-11-12 22:29:35,574 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Forceful destruction successful, exit code 0 [2021-11-12 22:29:35,769 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (60)] Ended with exit code 0 [2021-11-12 22:29:35,911 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt,62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 22:29:35,912 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:29:35,912 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:29:35,913 INFO L85 PathProgramCache]: Analyzing trace with hash 941012631, now seen corresponding path program 1 times [2021-11-12 22:29:35,918 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:29:35,918 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2103279606] [2021-11-12 22:29:35,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:29:35,919 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:29:35,919 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:29:35,920 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:29:35,922 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (63)] Waiting until timeout for monitored process [2021-11-12 22:29:42,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:29:42,422 INFO L263 TraceCheckSpWp]: Trace formula consists of 2372 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 22:29:42,428 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:29:44,454 INFO L134 CoverageAnalysis]: Checked inductivity of 490 backedges. 120 proven. 1 refuted. 0 times theorem prover too weak. 369 trivial. 0 not checked. [2021-11-12 22:29:44,454 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:29:46,646 INFO L134 CoverageAnalysis]: Checked inductivity of 490 backedges. 0 proven. 71 refuted. 0 times theorem prover too weak. 419 trivial. 0 not checked. [2021-11-12 22:29:46,646 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:29:46,646 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2103279606] [2021-11-12 22:29:46,646 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2103279606] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:29:46,646 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [567010663] [2021-11-12 22:29:46,647 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:29:46,647 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:29:46,647 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:29:46,648 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:29:46,649 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (64)] Waiting until timeout for monitored process [2021-11-12 22:29:51,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:29:51,772 INFO L263 TraceCheckSpWp]: Trace formula consists of 2372 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 22:29:51,780 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:29:53,478 INFO L134 CoverageAnalysis]: Checked inductivity of 490 backedges. 120 proven. 1 refuted. 0 times theorem prover too weak. 369 trivial. 0 not checked. [2021-11-12 22:29:53,479 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:29:55,042 INFO L134 CoverageAnalysis]: Checked inductivity of 490 backedges. 0 proven. 71 refuted. 0 times theorem prover too weak. 419 trivial. 0 not checked. [2021-11-12 22:29:55,042 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [567010663] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:29:55,043 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [724050876] [2021-11-12 22:29:55,047 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:29:55,049 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:29:55,049 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:29:55,050 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:29:55,071 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Waiting until timeout for monitored process [2021-11-12 22:29:56,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:29:56,990 INFO L263 TraceCheckSpWp]: Trace formula consists of 2372 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 22:29:56,997 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:29:57,448 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-12 22:29:57,472 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-12 22:29:58,760 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 48 treesize of output 36 [2021-11-12 22:29:58,770 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 29 treesize of output 17 [2021-11-12 22:29:59,677 INFO L134 CoverageAnalysis]: Checked inductivity of 490 backedges. 64 proven. 0 refuted. 0 times theorem prover too weak. 426 trivial. 0 not checked. [2021-11-12 22:29:59,678 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:30:00,926 INFO L134 CoverageAnalysis]: Checked inductivity of 490 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 490 trivial. 0 not checked. [2021-11-12 22:30:00,927 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [724050876] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 22:30:00,927 INFO L186 FreeRefinementEngine]: Found 2 perfect and 4 imperfect interpolant sequences. [2021-11-12 22:30:00,928 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 4] imperfect sequences [7, 7, 7, 7] total 15 [2021-11-12 22:30:00,928 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1559262198] [2021-11-12 22:30:00,928 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 22:30:00,929 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-12 22:30:00,929 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:30:00,929 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-12 22:30:00,930 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2021-11-12 22:30:00,930 INFO L87 Difference]: Start difference. First operand 2096 states and 2996 transitions. Second operand has 6 states, 6 states have (on average 40.333333333333336) internal successors, (242), 6 states have internal predecessors, (242), 5 states have call successors, (63), 3 states have call predecessors, (63), 3 states have return successors, (59), 5 states have call predecessors, (59), 5 states have call successors, (59) [2021-11-12 22:30:03,164 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.23s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 22:30:06,399 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.09s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 22:30:08,501 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.05s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 22:30:11,045 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 22:30:16,439 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 22:30:18,839 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 22:30:19,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:30:19,040 INFO L93 Difference]: Finished difference Result 3331 states and 4645 transitions. [2021-11-12 22:30:19,047 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-12 22:30:19,048 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 40.333333333333336) internal successors, (242), 6 states have internal predecessors, (242), 5 states have call successors, (63), 3 states have call predecessors, (63), 3 states have return successors, (59), 5 states have call predecessors, (59), 5 states have call successors, (59) Word has length 399 [2021-11-12 22:30:19,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:30:19,052 INFO L225 Difference]: With dead ends: 3331 [2021-11-12 22:30:19,052 INFO L226 Difference]: Without dead ends: 1280 [2021-11-12 22:30:19,056 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2389 GetRequests, 2372 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=44, Invalid=196, Unknown=0, NotChecked=0, Total=240 [2021-11-12 22:30:19,056 INFO L933 BasicCegarLoop]: 1220 mSDtfsCounter, 9 mSDsluCounter, 3328 mSDsCounter, 0 mSdLazyCounter, 151 mSolverCounterSat, 1 mSolverCounterUnsat, 6 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 17312.79ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 4548 SdHoareTripleChecker+Invalid, 314 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 10.44ms SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 151 IncrementalHoareTripleChecker+Invalid, 6 IncrementalHoareTripleChecker+Unknown, 156 IncrementalHoareTripleChecker+Unchecked, 17932.62ms IncrementalHoareTripleChecker+Time [2021-11-12 22:30:19,057 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 4548 Invalid, 314 Unknown, 0 Unchecked, 10.44ms Time], IncrementalHoareTripleChecker [1 Valid, 151 Invalid, 6 Unknown, 156 Unchecked, 17932.62ms Time] [2021-11-12 22:30:19,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1280 states. [2021-11-12 22:30:19,117 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1280 to 1248. [2021-11-12 22:30:19,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1248 states, 956 states have (on average 1.3169456066945606) internal successors, (1259), 965 states have internal predecessors, (1259), 199 states have call successors, (199), 91 states have call predecessors, (199), 92 states have return successors, (202), 195 states have call predecessors, (202), 191 states have call successors, (202) [2021-11-12 22:30:19,121 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1248 states to 1248 states and 1660 transitions. [2021-11-12 22:30:19,122 INFO L78 Accepts]: Start accepts. Automaton has 1248 states and 1660 transitions. Word has length 399 [2021-11-12 22:30:19,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:30:19,123 INFO L470 AbstractCegarLoop]: Abstraction has 1248 states and 1660 transitions. [2021-11-12 22:30:19,124 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 40.333333333333336) internal successors, (242), 6 states have internal predecessors, (242), 5 states have call successors, (63), 3 states have call predecessors, (63), 3 states have return successors, (59), 5 states have call predecessors, (59), 5 states have call successors, (59) [2021-11-12 22:30:19,124 INFO L276 IsEmpty]: Start isEmpty. Operand 1248 states and 1660 transitions. [2021-11-12 22:30:19,129 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 384 [2021-11-12 22:30:19,129 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:30:19,130 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 5, 5, 5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:30:19,185 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Forceful destruction successful, exit code 0 [2021-11-12 22:30:19,354 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (64)] Forceful destruction successful, exit code 0 [2021-11-12 22:30:19,579 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (63)] Forceful destruction successful, exit code 0 [2021-11-12 22:30:19,731 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt,63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 22:30:19,731 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:30:19,732 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:30:19,732 INFO L85 PathProgramCache]: Analyzing trace with hash -1270441131, now seen corresponding path program 1 times [2021-11-12 22:30:19,736 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:30:19,736 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1777046041] [2021-11-12 22:30:19,736 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:30:19,736 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:30:19,737 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:30:19,737 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:30:19,739 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (66)] Waiting until timeout for monitored process [2021-11-12 22:30:25,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:30:25,969 INFO L263 TraceCheckSpWp]: Trace formula consists of 2309 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 22:30:25,975 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:30:28,282 INFO L134 CoverageAnalysis]: Checked inductivity of 451 backedges. 120 proven. 1 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2021-11-12 22:30:28,282 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:30:30,310 INFO L134 CoverageAnalysis]: Checked inductivity of 451 backedges. 0 proven. 71 refuted. 0 times theorem prover too weak. 380 trivial. 0 not checked. [2021-11-12 22:30:30,310 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:30:30,310 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1777046041] [2021-11-12 22:30:30,310 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1777046041] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:30:30,310 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1215168792] [2021-11-12 22:30:30,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:30:30,310 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:30:30,311 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:30:30,311 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:30:30,315 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (67)] Waiting until timeout for monitored process [2021-11-12 22:30:35,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:30:35,526 INFO L263 TraceCheckSpWp]: Trace formula consists of 2309 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 22:30:35,536 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:30:37,293 INFO L134 CoverageAnalysis]: Checked inductivity of 451 backedges. 120 proven. 1 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2021-11-12 22:30:37,293 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:30:39,003 INFO L134 CoverageAnalysis]: Checked inductivity of 451 backedges. 0 proven. 71 refuted. 0 times theorem prover too weak. 380 trivial. 0 not checked. [2021-11-12 22:30:39,003 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1215168792] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:30:39,003 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1645500981] [2021-11-12 22:30:39,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:30:39,003 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:30:39,003 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:30:39,004 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:30:39,007 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Waiting until timeout for monitored process [2021-11-12 22:30:40,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:30:40,929 INFO L263 TraceCheckSpWp]: Trace formula consists of 2309 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 22:30:40,934 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:30:41,333 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-12 22:30:41,352 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-11-12 22:30:42,620 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 48 treesize of output 36 [2021-11-12 22:30:42,633 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 29 treesize of output 17 [2021-11-12 22:30:43,485 INFO L134 CoverageAnalysis]: Checked inductivity of 451 backedges. 46 proven. 0 refuted. 0 times theorem prover too weak. 405 trivial. 0 not checked. [2021-11-12 22:30:43,486 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:30:44,640 INFO L134 CoverageAnalysis]: Checked inductivity of 451 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 451 trivial. 0 not checked. [2021-11-12 22:30:44,641 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1645500981] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 22:30:44,641 INFO L186 FreeRefinementEngine]: Found 2 perfect and 4 imperfect interpolant sequences. [2021-11-12 22:30:44,642 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 4] imperfect sequences [7, 7, 7, 7] total 15 [2021-11-12 22:30:44,642 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1988257504] [2021-11-12 22:30:44,642 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 22:30:44,643 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-12 22:30:44,643 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:30:44,643 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-12 22:30:44,643 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2021-11-12 22:30:44,644 INFO L87 Difference]: Start difference. First operand 1248 states and 1660 transitions. Second operand has 6 states, 6 states have (on average 41.666666666666664) internal successors, (250), 6 states have internal predecessors, (250), 5 states have call successors, (58), 3 states have call predecessors, (58), 3 states have return successors, (55), 5 states have call predecessors, (55), 5 states have call successors, (55) [2021-11-12 22:30:46,918 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.27s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 22:30:48,929 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 22:30:51,719 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.59s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 22:30:53,744 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 22:30:55,828 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 22:30:57,847 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 22:31:01,160 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.03s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 22:31:01,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:31:01,551 INFO L93 Difference]: Finished difference Result 2025 states and 2630 transitions. [2021-11-12 22:31:01,560 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-12 22:31:01,561 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 41.666666666666664) internal successors, (250), 6 states have internal predecessors, (250), 5 states have call successors, (58), 3 states have call predecessors, (58), 3 states have return successors, (55), 5 states have call predecessors, (55), 5 states have call successors, (55) Word has length 383 [2021-11-12 22:31:01,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:31:01,563 INFO L225 Difference]: With dead ends: 2025 [2021-11-12 22:31:01,563 INFO L226 Difference]: Without dead ends: 822 [2021-11-12 22:31:01,565 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2293 GetRequests, 2276 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=44, Invalid=196, Unknown=0, NotChecked=0, Total=240 [2021-11-12 22:31:01,566 INFO L933 BasicCegarLoop]: 735 mSDtfsCounter, 7 mSDsluCounter, 2714 mSDsCounter, 0 mSdLazyCounter, 138 mSolverCounterSat, 1 mSolverCounterUnsat, 5 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 16331.91ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 3449 SdHoareTripleChecker+Invalid, 221 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 6.39ms SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 138 IncrementalHoareTripleChecker+Invalid, 5 IncrementalHoareTripleChecker+Unknown, 77 IncrementalHoareTripleChecker+Unchecked, 16769.02ms IncrementalHoareTripleChecker+Time [2021-11-12 22:31:01,566 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 3449 Invalid, 221 Unknown, 0 Unchecked, 6.39ms Time], IncrementalHoareTripleChecker [1 Valid, 138 Invalid, 5 Unknown, 77 Unchecked, 16769.02ms Time] [2021-11-12 22:31:01,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 822 states. [2021-11-12 22:31:01,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 822 to 816. [2021-11-12 22:31:01,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 816 states, 619 states have (on average 1.2520193861066236) internal successors, (775), 623 states have internal predecessors, (775), 121 states have call successors, (121), 76 states have call predecessors, (121), 75 states have return successors, (118), 117 states have call predecessors, (118), 116 states have call successors, (118) [2021-11-12 22:31:01,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 816 states to 816 states and 1014 transitions. [2021-11-12 22:31:01,605 INFO L78 Accepts]: Start accepts. Automaton has 816 states and 1014 transitions. Word has length 383 [2021-11-12 22:31:01,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:31:01,606 INFO L470 AbstractCegarLoop]: Abstraction has 816 states and 1014 transitions. [2021-11-12 22:31:01,606 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 41.666666666666664) internal successors, (250), 6 states have internal predecessors, (250), 5 states have call successors, (58), 3 states have call predecessors, (58), 3 states have return successors, (55), 5 states have call predecessors, (55), 5 states have call successors, (55) [2021-11-12 22:31:01,606 INFO L276 IsEmpty]: Start isEmpty. Operand 816 states and 1014 transitions. [2021-11-12 22:31:01,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 387 [2021-11-12 22:31:01,611 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:31:01,612 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:31:01,636 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (67)] Forceful destruction successful, exit code 0 [2021-11-12 22:31:01,860 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (66)] Forceful destruction successful, exit code 0 [2021-11-12 22:31:02,072 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Forceful destruction successful, exit code 0 [2021-11-12 22:31:02,215 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 67 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt,66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,68 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:31:02,215 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:31:02,216 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:31:02,216 INFO L85 PathProgramCache]: Analyzing trace with hash -549412101, now seen corresponding path program 1 times [2021-11-12 22:31:02,219 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:31:02,220 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1700151932] [2021-11-12 22:31:02,220 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:31:02,220 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:31:02,220 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:31:02,222 INFO L229 MonitoredProcess]: Starting monitored process 69 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:31:02,223 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (69)] Waiting until timeout for monitored process [2021-11-12 22:31:07,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:31:07,852 INFO L263 TraceCheckSpWp]: Trace formula consists of 2376 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 22:31:07,859 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:31:09,557 INFO L134 CoverageAnalysis]: Checked inductivity of 416 backedges. 112 proven. 1 refuted. 0 times theorem prover too weak. 303 trivial. 0 not checked. [2021-11-12 22:31:09,557 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:31:11,420 INFO L134 CoverageAnalysis]: Checked inductivity of 416 backedges. 0 proven. 71 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2021-11-12 22:31:11,420 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:31:11,420 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1700151932] [2021-11-12 22:31:11,420 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1700151932] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:31:11,420 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1043066851] [2021-11-12 22:31:11,420 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:31:11,421 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:31:11,421 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:31:11,421 INFO L229 MonitoredProcess]: Starting monitored process 70 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:31:11,423 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (70)] Waiting until timeout for monitored process [2021-11-12 22:31:13,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:31:13,768 INFO L263 TraceCheckSpWp]: Trace formula consists of 2376 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-12 22:31:13,774 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:31:15,173 INFO L134 CoverageAnalysis]: Checked inductivity of 416 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 406 trivial. 0 not checked. [2021-11-12 22:31:15,173 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:31:17,181 INFO L134 CoverageAnalysis]: Checked inductivity of 416 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 412 trivial. 0 not checked. [2021-11-12 22:31:17,182 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1043066851] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 22:31:17,182 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-12 22:31:17,182 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [7, 7, 7] total 21 [2021-11-12 22:31:17,182 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2061327176] [2021-11-12 22:31:17,182 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:31:17,183 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-12 22:31:17,183 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:31:17,183 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-12 22:31:17,183 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=367, Unknown=0, NotChecked=0, Total=420 [2021-11-12 22:31:17,184 INFO L87 Difference]: Start difference. First operand 816 states and 1014 transitions. Second operand has 7 states, 7 states have (on average 29.714285714285715) internal successors, (208), 5 states have internal predecessors, (208), 2 states have call successors, (41), 2 states have call predecessors, (41), 4 states have return successors, (36), 4 states have call predecessors, (36), 2 states have call successors, (36) [2021-11-12 22:31:19,380 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 22:31:19,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:31:19,398 INFO L93 Difference]: Finished difference Result 1598 states and 1990 transitions. [2021-11-12 22:31:19,418 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-12 22:31:19,419 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 29.714285714285715) internal successors, (208), 5 states have internal predecessors, (208), 2 states have call successors, (41), 2 states have call predecessors, (41), 4 states have return successors, (36), 4 states have call predecessors, (36), 2 states have call successors, (36) Word has length 386 [2021-11-12 22:31:19,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:31:19,421 INFO L225 Difference]: With dead ends: 1598 [2021-11-12 22:31:19,421 INFO L226 Difference]: Without dead ends: 827 [2021-11-12 22:31:19,423 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1540 GetRequests, 1521 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=53, Invalid=367, Unknown=0, NotChecked=0, Total=420 [2021-11-12 22:31:19,423 INFO L933 BasicCegarLoop]: 737 mSDtfsCounter, 2 mSDsluCounter, 3679 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 0 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2141.94ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 4416 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 6.41ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2156.17ms IncrementalHoareTripleChecker+Time [2021-11-12 22:31:19,424 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 4416 Invalid, 22 Unknown, 0 Unchecked, 6.41ms Time], IncrementalHoareTripleChecker [0 Valid, 21 Invalid, 1 Unknown, 0 Unchecked, 2156.17ms Time] [2021-11-12 22:31:19,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 827 states. [2021-11-12 22:31:19,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 827 to 823. [2021-11-12 22:31:19,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 823 states, 624 states have (on average 1.25) internal successors, (780), 628 states have internal predecessors, (780), 121 states have call successors, (121), 76 states have call predecessors, (121), 77 states have return successors, (122), 119 states have call predecessors, (122), 116 states have call successors, (122) [2021-11-12 22:31:19,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 823 states to 823 states and 1023 transitions. [2021-11-12 22:31:19,461 INFO L78 Accepts]: Start accepts. Automaton has 823 states and 1023 transitions. Word has length 386 [2021-11-12 22:31:19,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:31:19,462 INFO L470 AbstractCegarLoop]: Abstraction has 823 states and 1023 transitions. [2021-11-12 22:31:19,462 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 29.714285714285715) internal successors, (208), 5 states have internal predecessors, (208), 2 states have call successors, (41), 2 states have call predecessors, (41), 4 states have return successors, (36), 4 states have call predecessors, (36), 2 states have call successors, (36) [2021-11-12 22:31:19,463 INFO L276 IsEmpty]: Start isEmpty. Operand 823 states and 1023 transitions. [2021-11-12 22:31:19,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 407 [2021-11-12 22:31:19,468 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:31:19,468 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 5, 5, 5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:31:19,515 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (69)] Forceful destruction successful, exit code 0 [2021-11-12 22:31:19,691 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (70)] Forceful destruction successful, exit code 0 [2021-11-12 22:31:19,875 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 69 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,70 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 22:31:19,875 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:31:19,876 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:31:19,876 INFO L85 PathProgramCache]: Analyzing trace with hash 646347093, now seen corresponding path program 1 times [2021-11-12 22:31:19,880 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:31:19,880 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2072180516] [2021-11-12 22:31:19,880 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:31:19,880 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:31:19,880 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:31:19,881 INFO L229 MonitoredProcess]: Starting monitored process 71 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:31:19,882 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (71)] Waiting until timeout for monitored process [2021-11-12 22:31:24,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:31:25,080 INFO L263 TraceCheckSpWp]: Trace formula consists of 2417 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 22:31:25,084 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:31:26,820 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 120 proven. 1 refuted. 0 times theorem prover too weak. 323 trivial. 0 not checked. [2021-11-12 22:31:26,820 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:31:28,607 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 71 refuted. 0 times theorem prover too weak. 373 trivial. 0 not checked. [2021-11-12 22:31:28,607 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:31:28,607 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2072180516] [2021-11-12 22:31:28,607 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2072180516] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:31:28,607 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [420249332] [2021-11-12 22:31:28,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:31:28,607 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:31:28,607 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:31:28,608 INFO L229 MonitoredProcess]: Starting monitored process 72 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:31:28,611 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (72)] Waiting until timeout for monitored process [2021-11-12 22:31:30,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:31:30,987 INFO L263 TraceCheckSpWp]: Trace formula consists of 2417 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-12 22:31:30,993 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:31:31,895 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 444 trivial. 0 not checked. [2021-11-12 22:31:31,895 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:31:32,866 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 444 trivial. 0 not checked. [2021-11-12 22:31:32,866 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [420249332] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 22:31:32,866 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 22:31:32,867 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [7, 7] total 15 [2021-11-12 22:31:32,867 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [841396783] [2021-11-12 22:31:32,867 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 22:31:32,868 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-12 22:31:32,868 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:31:32,868 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-12 22:31:32,868 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2021-11-12 22:31:32,868 INFO L87 Difference]: Start difference. First operand 823 states and 1023 transitions. Second operand has 6 states, 6 states have (on average 37.666666666666664) internal successors, (226), 6 states have internal predecessors, (226), 2 states have call successors, (51), 2 states have call predecessors, (51), 2 states have return successors, (46), 2 states have call predecessors, (46), 2 states have call successors, (46) [2021-11-12 22:31:34,930 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 22:31:35,250 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:31:35,250 INFO L93 Difference]: Finished difference Result 1611 states and 2008 transitions. [2021-11-12 22:31:35,253 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-12 22:31:35,253 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 37.666666666666664) internal successors, (226), 6 states have internal predecessors, (226), 2 states have call successors, (51), 2 states have call predecessors, (51), 2 states have return successors, (46), 2 states have call predecessors, (46), 2 states have call successors, (46) Word has length 406 [2021-11-12 22:31:35,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:31:35,256 INFO L225 Difference]: With dead ends: 1611 [2021-11-12 22:31:35,257 INFO L226 Difference]: Without dead ends: 833 [2021-11-12 22:31:35,258 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1621 GetRequests, 1607 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=44, Invalid=196, Unknown=0, NotChecked=0, Total=240 [2021-11-12 22:31:35,259 INFO L933 BasicCegarLoop]: 738 mSDtfsCounter, 18 mSDsluCounter, 1475 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 4 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2224.87ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 2213 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.72ms SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2279.54ms IncrementalHoareTripleChecker+Time [2021-11-12 22:31:35,260 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 2213 Invalid, 16 Unknown, 0 Unchecked, 2.72ms Time], IncrementalHoareTripleChecker [4 Valid, 11 Invalid, 1 Unknown, 0 Unchecked, 2279.54ms Time] [2021-11-12 22:31:35,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 833 states. [2021-11-12 22:31:35,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 833 to 825. [2021-11-12 22:31:35,311 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 825 states, 626 states have (on average 1.2492012779552715) internal successors, (782), 630 states have internal predecessors, (782), 121 states have call successors, (121), 76 states have call predecessors, (121), 77 states have return successors, (122), 119 states have call predecessors, (122), 116 states have call successors, (122) [2021-11-12 22:31:35,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 825 states to 825 states and 1025 transitions. [2021-11-12 22:31:35,314 INFO L78 Accepts]: Start accepts. Automaton has 825 states and 1025 transitions. Word has length 406 [2021-11-12 22:31:35,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:31:35,315 INFO L470 AbstractCegarLoop]: Abstraction has 825 states and 1025 transitions. [2021-11-12 22:31:35,315 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 37.666666666666664) internal successors, (226), 6 states have internal predecessors, (226), 2 states have call successors, (51), 2 states have call predecessors, (51), 2 states have return successors, (46), 2 states have call predecessors, (46), 2 states have call successors, (46) [2021-11-12 22:31:35,315 INFO L276 IsEmpty]: Start isEmpty. Operand 825 states and 1025 transitions. [2021-11-12 22:31:35,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 430 [2021-11-12 22:31:35,320 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:31:35,321 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 5, 5, 5, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:31:35,388 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (71)] Forceful destruction successful, exit code 0 [2021-11-12 22:31:35,562 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (72)] Forceful destruction successful, exit code 0 [2021-11-12 22:31:35,747 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 71 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,72 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 22:31:35,747 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:31:35,748 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:31:35,748 INFO L85 PathProgramCache]: Analyzing trace with hash -1387816338, now seen corresponding path program 1 times [2021-11-12 22:31:35,751 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:31:35,751 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1125854126] [2021-11-12 22:31:35,752 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:31:35,752 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:31:35,752 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:31:35,753 INFO L229 MonitoredProcess]: Starting monitored process 73 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:31:35,757 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (73)] Waiting until timeout for monitored process [2021-11-12 22:31:41,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:31:41,309 INFO L263 TraceCheckSpWp]: Trace formula consists of 2497 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 22:31:41,315 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:31:43,163 INFO L134 CoverageAnalysis]: Checked inductivity of 456 backedges. 120 proven. 1 refuted. 0 times theorem prover too weak. 335 trivial. 0 not checked. [2021-11-12 22:31:43,163 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:31:45,164 INFO L134 CoverageAnalysis]: Checked inductivity of 456 backedges. 0 proven. 71 refuted. 0 times theorem prover too weak. 385 trivial. 0 not checked. [2021-11-12 22:31:45,165 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:31:45,165 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1125854126] [2021-11-12 22:31:45,165 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1125854126] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:31:45,165 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [321134149] [2021-11-12 22:31:45,165 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:31:45,165 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:31:45,165 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:31:45,166 INFO L229 MonitoredProcess]: Starting monitored process 74 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:31:45,167 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (74)] Waiting until timeout for monitored process [2021-11-12 22:31:47,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:31:47,450 INFO L263 TraceCheckSpWp]: Trace formula consists of 2497 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-12 22:31:47,456 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:31:49,362 INFO L134 CoverageAnalysis]: Checked inductivity of 456 backedges. 16 proven. 7 refuted. 0 times theorem prover too weak. 433 trivial. 0 not checked. [2021-11-12 22:31:49,362 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:31:52,194 INFO L134 CoverageAnalysis]: Checked inductivity of 456 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 450 trivial. 0 not checked. [2021-11-12 22:31:52,194 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [321134149] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:31:52,194 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [743429988] [2021-11-12 22:31:52,194 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:31:52,194 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:31:52,194 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:31:52,195 INFO L229 MonitoredProcess]: Starting monitored process 75 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:31:52,196 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (75)] Waiting until timeout for monitored process [2021-11-12 22:31:53,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:31:53,961 INFO L263 TraceCheckSpWp]: Trace formula consists of 2497 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-12 22:31:53,967 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:31:54,946 INFO L134 CoverageAnalysis]: Checked inductivity of 456 backedges. 16 proven. 0 refuted. 0 times theorem prover too weak. 440 trivial. 0 not checked. [2021-11-12 22:31:54,946 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:31:56,470 INFO L134 CoverageAnalysis]: Checked inductivity of 456 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 450 trivial. 0 not checked. [2021-11-12 22:31:56,470 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [743429988] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 22:31:56,471 INFO L186 FreeRefinementEngine]: Found 1 perfect and 5 imperfect interpolant sequences. [2021-11-12 22:31:56,471 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [7, 7, 11, 9, 9] total 27 [2021-11-12 22:31:56,472 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [472244249] [2021-11-12 22:31:56,472 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:31:56,473 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-12 22:31:56,473 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:31:56,473 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-12 22:31:56,474 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=635, Unknown=0, NotChecked=0, Total=702 [2021-11-12 22:31:56,474 INFO L87 Difference]: Start difference. First operand 825 states and 1025 transitions. Second operand has 9 states, 9 states have (on average 25.666666666666668) internal successors, (231), 7 states have internal predecessors, (231), 2 states have call successors, (47), 2 states have call predecessors, (47), 4 states have return successors, (42), 4 states have call predecessors, (42), 2 states have call successors, (42) [2021-11-12 22:31:58,528 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 22:32:00,194 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.04s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 22:32:00,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:32:00,301 INFO L93 Difference]: Finished difference Result 1618 states and 2012 transitions. [2021-11-12 22:32:00,307 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-12 22:32:00,307 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 25.666666666666668) internal successors, (231), 7 states have internal predecessors, (231), 2 states have call successors, (47), 2 states have call predecessors, (47), 4 states have return successors, (42), 4 states have call predecessors, (42), 2 states have call successors, (42) Word has length 429 [2021-11-12 22:32:00,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:32:00,311 INFO L225 Difference]: With dead ends: 1618 [2021-11-12 22:32:00,311 INFO L226 Difference]: Without dead ends: 838 [2021-11-12 22:32:00,313 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2571 GetRequests, 2543 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=88, Invalid=782, Unknown=0, NotChecked=0, Total=870 [2021-11-12 22:32:00,314 INFO L933 BasicCegarLoop]: 735 mSDtfsCounter, 12 mSDsluCounter, 5128 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 1 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3316.26ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 5863 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 6.83ms SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3385.50ms IncrementalHoareTripleChecker+Time [2021-11-12 22:32:00,314 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 5863 Invalid, 51 Unknown, 0 Unchecked, 6.83ms Time], IncrementalHoareTripleChecker [1 Valid, 49 Invalid, 1 Unknown, 0 Unchecked, 3385.50ms Time] [2021-11-12 22:32:00,315 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 838 states. [2021-11-12 22:32:00,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 838 to 832. [2021-11-12 22:32:00,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 832 states, 632 states have (on average 1.2468354430379747) internal successors, (788), 635 states have internal predecessors, (788), 121 states have call successors, (121), 76 states have call predecessors, (121), 78 states have return successors, (123), 121 states have call predecessors, (123), 116 states have call successors, (123) [2021-11-12 22:32:00,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 832 states to 832 states and 1032 transitions. [2021-11-12 22:32:00,357 INFO L78 Accepts]: Start accepts. Automaton has 832 states and 1032 transitions. Word has length 429 [2021-11-12 22:32:00,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:32:00,357 INFO L470 AbstractCegarLoop]: Abstraction has 832 states and 1032 transitions. [2021-11-12 22:32:00,357 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 25.666666666666668) internal successors, (231), 7 states have internal predecessors, (231), 2 states have call successors, (47), 2 states have call predecessors, (47), 4 states have return successors, (42), 4 states have call predecessors, (42), 2 states have call successors, (42) [2021-11-12 22:32:00,357 INFO L276 IsEmpty]: Start isEmpty. Operand 832 states and 1032 transitions. [2021-11-12 22:32:00,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 450 [2021-11-12 22:32:00,361 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:32:00,362 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:32:00,395 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (74)] Forceful destruction successful, exit code 0 [2021-11-12 22:32:00,626 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (73)] Forceful destruction successful, exit code 0 [2021-11-12 22:32:00,832 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (75)] Ended with exit code 0 [2021-11-12 22:32:00,980 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 74 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt,73 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,75 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:32:00,980 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:32:00,981 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:32:00,981 INFO L85 PathProgramCache]: Analyzing trace with hash 1361729748, now seen corresponding path program 2 times [2021-11-12 22:32:00,984 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:32:00,984 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1849049005] [2021-11-12 22:32:00,984 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-12 22:32:00,984 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:32:00,984 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:32:00,985 INFO L229 MonitoredProcess]: Starting monitored process 76 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:32:00,986 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dba8338d-6be5-4bd3-a485-1864ff8608b4/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (76)] Waiting until timeout for monitored process