./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/weaver/popl20-simple-queue.wvr.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version e04fb08f Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/config/TaipanReach.xml -i ../../sv-benchmarks/c/weaver/popl20-simple-queue.wvr.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0 --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 32bit --witnessprinter.graph.data.programhash 610058eb9ed98833ba9b7a0798b4759bf36fe1b982d69af76f73ab299f075720 --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-e04fb08 [2022-11-16 20:12:36,922 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-16 20:12:36,924 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-16 20:12:36,965 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-16 20:12:36,966 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-16 20:12:36,967 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-16 20:12:36,968 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-16 20:12:36,970 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-16 20:12:36,971 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-16 20:12:36,972 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-16 20:12:36,973 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-16 20:12:36,979 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-16 20:12:36,979 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-16 20:12:36,985 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-16 20:12:36,987 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-16 20:12:36,989 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-16 20:12:36,991 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-16 20:12:36,993 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-16 20:12:36,996 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-16 20:12:37,003 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-16 20:12:37,005 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-16 20:12:37,006 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-16 20:12:37,010 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-16 20:12:37,011 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-16 20:12:37,019 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-16 20:12:37,019 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-16 20:12:37,019 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-16 20:12:37,021 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-16 20:12:37,022 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-16 20:12:37,023 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-16 20:12:37,023 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-16 20:12:37,024 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-16 20:12:37,026 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-16 20:12:37,028 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-16 20:12:37,030 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-16 20:12:37,031 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-16 20:12:37,032 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-16 20:12:37,032 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-16 20:12:37,032 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-16 20:12:37,033 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-16 20:12:37,034 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-16 20:12:37,035 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-16 20:12:37,073 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-16 20:12:37,073 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-16 20:12:37,074 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-16 20:12:37,075 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-16 20:12:37,076 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-16 20:12:37,076 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-16 20:12:37,076 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-16 20:12:37,077 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-16 20:12:37,077 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-16 20:12:37,077 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-16 20:12:37,078 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-16 20:12:37,079 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-16 20:12:37,079 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-16 20:12:37,079 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-16 20:12:37,079 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-16 20:12:37,080 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-16 20:12:37,080 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-16 20:12:37,080 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-16 20:12:37,081 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-16 20:12:37,081 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-16 20:12:37,082 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-16 20:12:37,082 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-16 20:12:37,082 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-16 20:12:37,083 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-16 20:12:37,083 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-16 20:12:37,083 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-16 20:12:37,083 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-16 20:12:37,084 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-16 20:12:37,084 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-16 20:12:37,084 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-16 20:12:37,084 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-16 20:12:37,085 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-16 20:12:37,085 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-16 20:12:37,086 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-16 20:12:37,086 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-16 20:12:37,086 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-16 20:12:37,086 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-16 20:12:37,087 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-16 20:12:37,087 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-16 20:12:37,087 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-16 20:12:37,087 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-16 20:12:37,088 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 610058eb9ed98833ba9b7a0798b4759bf36fe1b982d69af76f73ab299f075720 [2022-11-16 20:12:37,427 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-16 20:12:37,464 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-16 20:12:37,468 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-16 20:12:37,469 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-16 20:12:37,470 INFO L275 PluginConnector]: CDTParser initialized [2022-11-16 20:12:37,471 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/../../sv-benchmarks/c/weaver/popl20-simple-queue.wvr.c [2022-11-16 20:12:37,540 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/data/224c5d5fc/8e4d199e2a0442ee88a0bb2ab002967a/FLAG9a95e583e [2022-11-16 20:12:38,015 INFO L306 CDTParser]: Found 1 translation units. [2022-11-16 20:12:38,019 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/sv-benchmarks/c/weaver/popl20-simple-queue.wvr.c [2022-11-16 20:12:38,028 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/data/224c5d5fc/8e4d199e2a0442ee88a0bb2ab002967a/FLAG9a95e583e [2022-11-16 20:12:38,396 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/data/224c5d5fc/8e4d199e2a0442ee88a0bb2ab002967a [2022-11-16 20:12:38,399 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-16 20:12:38,402 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-16 20:12:38,406 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-16 20:12:38,406 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-16 20:12:38,410 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-16 20:12:38,411 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 16.11 08:12:38" (1/1) ... [2022-11-16 20:12:38,412 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4bb949b6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:12:38, skipping insertion in model container [2022-11-16 20:12:38,413 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 16.11 08:12:38" (1/1) ... [2022-11-16 20:12:38,420 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-16 20:12:38,440 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-16 20:12:38,715 WARN L229 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_c39f5b4b-84ea-4be8-ac62-623f20577e22/sv-benchmarks/c/weaver/popl20-simple-queue.wvr.c[2438,2451] [2022-11-16 20:12:38,725 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-16 20:12:38,733 INFO L203 MainTranslator]: Completed pre-run [2022-11-16 20:12:38,750 WARN L229 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_c39f5b4b-84ea-4be8-ac62-623f20577e22/sv-benchmarks/c/weaver/popl20-simple-queue.wvr.c[2438,2451] [2022-11-16 20:12:38,757 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-16 20:12:38,777 INFO L208 MainTranslator]: Completed translation [2022-11-16 20:12:38,778 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:12:38 WrapperNode [2022-11-16 20:12:38,778 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-16 20:12:38,779 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-16 20:12:38,779 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-16 20:12:38,780 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-16 20:12:38,787 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:12:38" (1/1) ... [2022-11-16 20:12:38,801 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:12:38" (1/1) ... [2022-11-16 20:12:38,831 INFO L138 Inliner]: procedures = 24, calls = 33, calls flagged for inlining = 9, calls inlined = 9, statements flattened = 128 [2022-11-16 20:12:38,831 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-16 20:12:38,832 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-16 20:12:38,832 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-16 20:12:38,832 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-16 20:12:38,847 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:12:38" (1/1) ... [2022-11-16 20:12:38,847 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:12:38" (1/1) ... [2022-11-16 20:12:38,867 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:12:38" (1/1) ... [2022-11-16 20:12:38,868 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:12:38" (1/1) ... [2022-11-16 20:12:38,873 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:12:38" (1/1) ... [2022-11-16 20:12:38,877 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:12:38" (1/1) ... [2022-11-16 20:12:38,878 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:12:38" (1/1) ... [2022-11-16 20:12:38,880 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:12:38" (1/1) ... [2022-11-16 20:12:38,882 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-16 20:12:38,896 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-16 20:12:38,896 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-16 20:12:38,896 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-16 20:12:38,897 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:12:38" (1/1) ... [2022-11-16 20:12:38,905 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-16 20:12:38,917 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:12:38,936 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-16 20:12:38,961 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-16 20:12:38,987 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-16 20:12:38,987 INFO L130 BoogieDeclarations]: Found specification of procedure thread1 [2022-11-16 20:12:38,987 INFO L138 BoogieDeclarations]: Found implementation of procedure thread1 [2022-11-16 20:12:38,987 INFO L130 BoogieDeclarations]: Found specification of procedure thread2 [2022-11-16 20:12:38,987 INFO L138 BoogieDeclarations]: Found implementation of procedure thread2 [2022-11-16 20:12:38,987 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-16 20:12:38,987 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-11-16 20:12:38,988 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-11-16 20:12:38,988 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_atomic_end [2022-11-16 20:12:38,988 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_atomic_begin [2022-11-16 20:12:38,988 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2022-11-16 20:12:38,989 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-16 20:12:38,989 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-16 20:12:38,989 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-11-16 20:12:38,989 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-11-16 20:12:38,990 WARN L209 CfgBuilder]: User set CodeBlockSize to LoopFreeBlock but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to SingleStatement [2022-11-16 20:12:39,122 INFO L235 CfgBuilder]: Building ICFG [2022-11-16 20:12:39,124 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-16 20:12:39,488 INFO L276 CfgBuilder]: Performing block encoding [2022-11-16 20:12:39,607 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-16 20:12:39,608 INFO L300 CfgBuilder]: Removed 3 assume(true) statements. [2022-11-16 20:12:39,610 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 16.11 08:12:39 BoogieIcfgContainer [2022-11-16 20:12:39,610 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-16 20:12:39,613 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-16 20:12:39,613 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-16 20:12:39,617 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-16 20:12:39,618 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 16.11 08:12:38" (1/3) ... [2022-11-16 20:12:39,618 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@76cba0a1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 16.11 08:12:39, skipping insertion in model container [2022-11-16 20:12:39,619 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:12:38" (2/3) ... [2022-11-16 20:12:39,619 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@76cba0a1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 16.11 08:12:39, skipping insertion in model container [2022-11-16 20:12:39,619 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 16.11 08:12:39" (3/3) ... [2022-11-16 20:12:39,621 INFO L112 eAbstractionObserver]: Analyzing ICFG popl20-simple-queue.wvr.c [2022-11-16 20:12:39,629 WARN L145 ceAbstractionStarter]: Switching off computation of Hoare annotation because input is a concurrent program [2022-11-16 20:12:39,640 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-16 20:12:39,640 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-16 20:12:39,641 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2022-11-16 20:12:39,714 INFO L144 ThreadInstanceAdder]: Constructed 2 joinOtherThreadTransitions. [2022-11-16 20:12:39,748 INFO L115 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2022-11-16 20:12:39,760 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 118 places, 120 transitions, 256 flow [2022-11-16 20:12:39,763 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 118 places, 120 transitions, 256 flow [2022-11-16 20:12:39,765 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 118 places, 120 transitions, 256 flow [2022-11-16 20:12:39,844 INFO L130 PetriNetUnfolder]: 9/118 cut-off events. [2022-11-16 20:12:39,845 INFO L131 PetriNetUnfolder]: For 2/2 co-relation queries the response was YES. [2022-11-16 20:12:39,851 INFO L83 FinitePrefix]: Finished finitePrefix Result has 127 conditions, 118 events. 9/118 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 4. Compared 62 event pairs, 0 based on Foata normal form. 0/108 useless extension candidates. Maximal degree in co-relation 85. Up to 2 conditions per place. [2022-11-16 20:12:39,854 INFO L119 LiptonReduction]: Number of co-enabled transitions 368 [2022-11-16 20:12:44,900 INFO L134 LiptonReduction]: Checked pairs total: 425 [2022-11-16 20:12:44,901 INFO L136 LiptonReduction]: Total number of compositions: 122 [2022-11-16 20:12:44,908 INFO L113 iNet2FiniteAutomaton]: Start petriNet2FiniteAutomaton. Operand has 22 places, 18 transitions, 52 flow [2022-11-16 20:12:44,921 INFO L135 iNet2FiniteAutomaton]: Finished petriNet2FiniteAutomaton. Result has 21 states, 20 states have (on average 2.1) internal successors, (42), 20 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:12:44,937 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-16 20:12:44,944 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=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, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@4a406e83, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-16 20:12:44,944 INFO L358 AbstractCegarLoop]: Starting to check reachability of 3 error locations. [2022-11-16 20:12:44,946 INFO L276 IsEmpty]: Start isEmpty. Operand has 21 states, 20 states have (on average 2.1) internal successors, (42), 20 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:12:44,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-11-16 20:12:44,952 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:12:44,952 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:12:44,953 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:12:44,958 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:12:44,958 INFO L85 PathProgramCache]: Analyzing trace with hash 1751700504, now seen corresponding path program 1 times [2022-11-16 20:12:44,968 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:12:44,968 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1204654164] [2022-11-16 20:12:44,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:12:44,969 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:12:45,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:12:45,462 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:12:45,462 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:12:45,463 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1204654164] [2022-11-16 20:12:45,464 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1204654164] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-16 20:12:45,464 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-16 20:12:45,465 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2022-11-16 20:12:45,466 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1317386234] [2022-11-16 20:12:45,467 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 20:12:45,471 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-16 20:12:45,473 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:12:45,499 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-16 20:12:45,500 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-16 20:12:45,502 INFO L87 Difference]: Start difference. First operand has 21 states, 20 states have (on average 2.1) internal successors, (42), 20 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 2 states have (on average 6.0) internal successors, (12), 2 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:12:45,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:12:45,574 INFO L93 Difference]: Finished difference Result 34 states and 71 transitions. [2022-11-16 20:12:45,575 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-16 20:12:45,577 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 6.0) internal successors, (12), 2 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2022-11-16 20:12:45,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:12:45,586 INFO L225 Difference]: With dead ends: 34 [2022-11-16 20:12:45,586 INFO L226 Difference]: Without dead ends: 27 [2022-11-16 20:12:45,588 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-16 20:12:45,593 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 2 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-16 20:12:45,595 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 0 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-16 20:12:45,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2022-11-16 20:12:45,627 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2022-11-16 20:12:45,628 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 2.1538461538461537) internal successors, (56), 26 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:12:45,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 56 transitions. [2022-11-16 20:12:45,632 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 56 transitions. Word has length 12 [2022-11-16 20:12:45,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:12:45,633 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 56 transitions. [2022-11-16 20:12:45,638 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 6.0) internal successors, (12), 2 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:12:45,638 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 56 transitions. [2022-11-16 20:12:45,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-16 20:12:45,639 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:12:45,640 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:12:45,640 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-16 20:12:45,640 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:12:45,641 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:12:45,641 INFO L85 PathProgramCache]: Analyzing trace with hash 1230300010, now seen corresponding path program 1 times [2022-11-16 20:12:45,642 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:12:45,643 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [266578909] [2022-11-16 20:12:45,643 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:12:45,644 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:12:45,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:12:45,833 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:12:45,833 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:12:45,833 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [266578909] [2022-11-16 20:12:45,833 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [266578909] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-16 20:12:45,834 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-16 20:12:45,834 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-16 20:12:45,834 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1320827751] [2022-11-16 20:12:45,834 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 20:12:45,836 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-16 20:12:45,836 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:12:45,836 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-16 20:12:45,837 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-16 20:12:45,837 INFO L87 Difference]: Start difference. First operand 27 states and 56 transitions. Second operand has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 2 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:12:45,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:12:45,880 INFO L93 Difference]: Finished difference Result 37 states and 72 transitions. [2022-11-16 20:12:45,881 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-16 20:12:45,881 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 2 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2022-11-16 20:12:45,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:12:45,883 INFO L225 Difference]: With dead ends: 37 [2022-11-16 20:12:45,884 INFO L226 Difference]: Without dead ends: 31 [2022-11-16 20:12:45,884 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-16 20:12:45,885 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 4 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-16 20:12:45,885 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 0 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-16 20:12:45,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2022-11-16 20:12:45,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2022-11-16 20:12:45,890 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 30 states have (on average 2.1) internal successors, (63), 30 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:12:45,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 63 transitions. [2022-11-16 20:12:45,891 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 63 transitions. Word has length 13 [2022-11-16 20:12:45,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:12:45,891 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 63 transitions. [2022-11-16 20:12:45,892 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 2 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:12:45,892 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 63 transitions. [2022-11-16 20:12:45,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-16 20:12:45,893 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:12:45,893 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:12:45,893 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-16 20:12:45,893 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:12:45,894 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:12:45,896 INFO L85 PathProgramCache]: Analyzing trace with hash -1771533333, now seen corresponding path program 1 times [2022-11-16 20:12:45,897 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:12:45,897 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1451724142] [2022-11-16 20:12:45,897 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:12:45,897 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:12:45,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:12:46,097 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-16 20:12:46,097 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:12:46,098 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1451724142] [2022-11-16 20:12:46,098 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1451724142] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-16 20:12:46,098 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-16 20:12:46,098 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-16 20:12:46,099 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1986783201] [2022-11-16 20:12:46,099 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 20:12:46,099 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-16 20:12:46,100 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:12:46,100 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-16 20:12:46,101 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-16 20:12:46,101 INFO L87 Difference]: Start difference. First operand 31 states and 63 transitions. Second operand has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:12:46,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:12:46,159 INFO L93 Difference]: Finished difference Result 37 states and 69 transitions. [2022-11-16 20:12:46,160 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-16 20:12:46,160 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2022-11-16 20:12:46,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:12:46,163 INFO L225 Difference]: With dead ends: 37 [2022-11-16 20:12:46,163 INFO L226 Difference]: Without dead ends: 32 [2022-11-16 20:12:46,164 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-11-16 20:12:46,167 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 6 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-16 20:12:46,168 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 0 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-16 20:12:46,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2022-11-16 20:12:46,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2022-11-16 20:12:46,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 31 states have (on average 2.064516129032258) internal successors, (64), 31 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:12:46,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 64 transitions. [2022-11-16 20:12:46,177 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 64 transitions. Word has length 14 [2022-11-16 20:12:46,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:12:46,177 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 64 transitions. [2022-11-16 20:12:46,177 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:12:46,178 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 64 transitions. [2022-11-16 20:12:46,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-11-16 20:12:46,178 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:12:46,178 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:12:46,179 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-11-16 20:12:46,179 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:12:46,179 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:12:46,179 INFO L85 PathProgramCache]: Analyzing trace with hash 1682792658, now seen corresponding path program 1 times [2022-11-16 20:12:46,180 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:12:46,180 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [388294781] [2022-11-16 20:12:46,180 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:12:46,180 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:12:46,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:12:46,742 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:12:46,742 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:12:46,742 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [388294781] [2022-11-16 20:12:46,742 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [388294781] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:12:46,743 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [554983368] [2022-11-16 20:12:46,743 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:12:46,743 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:12:46,743 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:12:46,746 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:12:46,774 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-16 20:12:46,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:12:46,887 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 35 conjunts are in the unsatisfiable core [2022-11-16 20:12:46,893 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:12:47,030 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-16 20:12:47,101 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-16 20:12:47,157 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-16 20:12:47,276 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 7 [2022-11-16 20:12:47,289 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:12:47,289 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:12:47,663 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-16 20:12:47,664 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 60 treesize of output 48 [2022-11-16 20:12:47,686 INFO L321 Elim1Store]: treesize reduction 5, result has 58.3 percent of original size [2022-11-16 20:12:47,687 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 300 treesize of output 275 [2022-11-16 20:12:47,720 INFO L321 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2022-11-16 20:12:47,721 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 268 treesize of output 220 [2022-11-16 20:12:47,738 INFO L321 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2022-11-16 20:12:47,739 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 220 treesize of output 196 [2022-11-16 20:12:47,845 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:12:47,845 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [554983368] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:12:47,846 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [191590280] [2022-11-16 20:12:47,853 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:12:47,860 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:12:47,861 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6, 6] total 15 [2022-11-16 20:12:47,861 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [19123701] [2022-11-16 20:12:47,861 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:12:47,863 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-11-16 20:12:47,863 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:12:47,865 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-11-16 20:12:47,865 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=205, Unknown=2, NotChecked=0, Total=272 [2022-11-16 20:12:47,866 INFO L87 Difference]: Start difference. First operand 32 states and 64 transitions. Second operand has 17 states, 16 states have (on average 2.0625) internal successors, (33), 16 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:12:48,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:12:48,736 INFO L93 Difference]: Finished difference Result 160 states and 338 transitions. [2022-11-16 20:12:48,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-16 20:12:48,737 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 2.0625) internal successors, (33), 16 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2022-11-16 20:12:48,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:12:48,738 INFO L225 Difference]: With dead ends: 160 [2022-11-16 20:12:48,738 INFO L226 Difference]: Without dead ends: 139 [2022-11-16 20:12:48,739 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 105 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=199, Invalid=666, Unknown=5, NotChecked=0, Total=870 [2022-11-16 20:12:48,740 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 140 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 217 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 140 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 371 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 217 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 138 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-16 20:12:48,740 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [140 Valid, 0 Invalid, 371 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 217 Invalid, 0 Unknown, 138 Unchecked, 0.3s Time] [2022-11-16 20:12:48,741 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2022-11-16 20:12:48,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 68. [2022-11-16 20:12:48,754 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 67 states have (on average 2.328358208955224) internal successors, (156), 67 states have internal predecessors, (156), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:12:48,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 156 transitions. [2022-11-16 20:12:48,758 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 156 transitions. Word has length 15 [2022-11-16 20:12:48,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:12:48,759 INFO L495 AbstractCegarLoop]: Abstraction has 68 states and 156 transitions. [2022-11-16 20:12:48,759 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 2.0625) internal successors, (33), 16 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:12:48,760 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 156 transitions. [2022-11-16 20:12:48,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-11-16 20:12:48,761 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:12:48,762 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:12:48,773 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-16 20:12:48,966 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:12:48,967 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:12:48,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:12:48,967 INFO L85 PathProgramCache]: Analyzing trace with hash 1039906040, now seen corresponding path program 2 times [2022-11-16 20:12:48,967 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:12:48,968 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1700036811] [2022-11-16 20:12:48,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:12:48,968 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:12:49,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:12:49,718 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:12:49,718 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:12:49,718 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1700036811] [2022-11-16 20:12:49,718 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1700036811] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:12:49,719 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1922225822] [2022-11-16 20:12:49,719 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 20:12:49,719 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:12:49,719 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:12:49,721 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:12:49,765 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-16 20:12:49,842 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-16 20:12:49,842 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:12:49,844 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 35 conjunts are in the unsatisfiable core [2022-11-16 20:12:49,846 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:12:49,900 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-16 20:12:49,955 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-16 20:12:50,034 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 20:12:50,035 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 20 [2022-11-16 20:12:50,085 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 7 [2022-11-16 20:12:50,097 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:12:50,097 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:12:50,343 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-16 20:12:50,343 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 57 treesize of output 45 [2022-11-16 20:12:50,356 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-16 20:12:50,356 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 178 treesize of output 166 [2022-11-16 20:12:50,374 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-16 20:12:50,375 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 90 treesize of output 84 [2022-11-16 20:12:50,385 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 118 treesize of output 94 [2022-11-16 20:12:50,602 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:12:50,603 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1922225822] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:12:50,603 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2073892510] [2022-11-16 20:12:50,603 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:12:50,604 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:12:50,604 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 16 [2022-11-16 20:12:50,604 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1818014461] [2022-11-16 20:12:50,604 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:12:50,605 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-16 20:12:50,605 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:12:50,605 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-16 20:12:50,605 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=242, Unknown=8, NotChecked=0, Total=306 [2022-11-16 20:12:50,606 INFO L87 Difference]: Start difference. First operand 68 states and 156 transitions. Second operand has 18 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:12:51,264 WARN L833 $PredicateComparison]: unable to prove that (and (forall ((v_ArrVal_107 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~#t2~0#1.base| v_ArrVal_107) c_~queue~0.base) (+ c_~queue~0.offset (* c_~front~0 4))) 5)) (= 5 c_~x~0)) is different from false [2022-11-16 20:12:51,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:12:51,748 INFO L93 Difference]: Finished difference Result 194 states and 414 transitions. [2022-11-16 20:12:51,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-11-16 20:12:51,749 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2022-11-16 20:12:51,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:12:51,751 INFO L225 Difference]: With dead ends: 194 [2022-11-16 20:12:51,751 INFO L226 Difference]: Without dead ends: 173 [2022-11-16 20:12:51,752 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 127 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=206, Invalid=779, Unknown=11, NotChecked=60, Total=1056 [2022-11-16 20:12:51,752 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 238 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 238 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 238 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 380 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 238 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 124 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-16 20:12:51,753 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [238 Valid, 0 Invalid, 380 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 238 Invalid, 0 Unknown, 124 Unchecked, 0.3s Time] [2022-11-16 20:12:51,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2022-11-16 20:12:51,765 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 70. [2022-11-16 20:12:51,766 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 2.318840579710145) internal successors, (160), 69 states have internal predecessors, (160), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:12:51,766 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 160 transitions. [2022-11-16 20:12:51,766 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 160 transitions. Word has length 15 [2022-11-16 20:12:51,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:12:51,767 INFO L495 AbstractCegarLoop]: Abstraction has 70 states and 160 transitions. [2022-11-16 20:12:51,767 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:12:51,767 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 160 transitions. [2022-11-16 20:12:51,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-11-16 20:12:51,768 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:12:51,768 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:12:51,779 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-16 20:12:51,969 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:12:51,969 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:12:51,970 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:12:51,970 INFO L85 PathProgramCache]: Analyzing trace with hash -905843216, now seen corresponding path program 3 times [2022-11-16 20:12:51,970 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:12:51,970 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1413284460] [2022-11-16 20:12:51,970 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:12:51,971 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:12:51,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:12:52,098 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-16 20:12:52,098 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:12:52,099 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1413284460] [2022-11-16 20:12:52,099 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1413284460] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-16 20:12:52,099 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-16 20:12:52,099 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-16 20:12:52,099 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [961770792] [2022-11-16 20:12:52,100 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 20:12:52,100 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-16 20:12:52,100 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:12:52,101 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-16 20:12:52,101 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-16 20:12:52,101 INFO L87 Difference]: Start difference. First operand 70 states and 160 transitions. Second operand has 4 states, 4 states have (on average 4.0) internal successors, (16), 3 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:12:52,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:12:52,151 INFO L93 Difference]: Finished difference Result 115 states and 232 transitions. [2022-11-16 20:12:52,152 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-16 20:12:52,152 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.0) internal successors, (16), 3 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2022-11-16 20:12:52,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:12:52,153 INFO L225 Difference]: With dead ends: 115 [2022-11-16 20:12:52,153 INFO L226 Difference]: Without dead ends: 105 [2022-11-16 20:12:52,153 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-16 20:12:52,154 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 23 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-16 20:12:52,155 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 0 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-16 20:12:52,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2022-11-16 20:12:52,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 85. [2022-11-16 20:12:52,162 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 84 states have (on average 2.1785714285714284) internal successors, (183), 84 states have internal predecessors, (183), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:12:52,163 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 183 transitions. [2022-11-16 20:12:52,163 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 183 transitions. Word has length 16 [2022-11-16 20:12:52,163 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:12:52,163 INFO L495 AbstractCegarLoop]: Abstraction has 85 states and 183 transitions. [2022-11-16 20:12:52,164 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.0) internal successors, (16), 3 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:12:52,164 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 183 transitions. [2022-11-16 20:12:52,165 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-11-16 20:12:52,165 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:12:52,165 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:12:52,165 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-11-16 20:12:52,166 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:12:52,166 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:12:52,166 INFO L85 PathProgramCache]: Analyzing trace with hash -1251909529, now seen corresponding path program 4 times [2022-11-16 20:12:52,166 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:12:52,167 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [640483722] [2022-11-16 20:12:52,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:12:52,167 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:12:52,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:12:53,379 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:12:53,379 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:12:53,380 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [640483722] [2022-11-16 20:12:53,380 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [640483722] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:12:53,380 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [85029474] [2022-11-16 20:12:53,380 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-16 20:12:53,380 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:12:53,380 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:12:53,381 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:12:53,385 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-16 20:12:53,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:12:53,488 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 27 conjunts are in the unsatisfiable core [2022-11-16 20:12:53,490 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:12:53,608 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 20:12:53,609 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 20 [2022-11-16 20:12:53,646 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 7 [2022-11-16 20:12:53,652 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-16 20:12:53,652 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:12:53,723 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-16 20:12:53,723 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 38 [2022-11-16 20:12:53,729 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 3 [2022-11-16 20:12:53,806 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-16 20:12:53,807 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [85029474] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:12:53,807 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [219909125] [2022-11-16 20:12:53,808 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:12:53,809 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:12:53,809 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 5] total 15 [2022-11-16 20:12:53,809 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1856221713] [2022-11-16 20:12:53,830 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:12:53,830 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-11-16 20:12:53,830 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:12:53,831 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-11-16 20:12:53,831 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=227, Unknown=3, NotChecked=0, Total=272 [2022-11-16 20:12:53,831 INFO L87 Difference]: Start difference. First operand 85 states and 183 transitions. Second operand has 17 states, 16 states have (on average 2.25) internal successors, (36), 16 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:12:54,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:12:54,555 INFO L93 Difference]: Finished difference Result 181 states and 397 transitions. [2022-11-16 20:12:54,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-16 20:12:54,556 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 2.25) internal successors, (36), 16 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2022-11-16 20:12:54,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:12:54,557 INFO L225 Difference]: With dead ends: 181 [2022-11-16 20:12:54,557 INFO L226 Difference]: Without dead ends: 158 [2022-11-16 20:12:54,558 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=105, Invalid=444, Unknown=3, NotChecked=0, Total=552 [2022-11-16 20:12:54,559 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 84 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 354 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 364 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 354 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-16 20:12:54,559 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [84 Valid, 0 Invalid, 364 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 354 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-16 20:12:54,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2022-11-16 20:12:54,564 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 72. [2022-11-16 20:12:54,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 71 states have (on average 2.211267605633803) internal successors, (157), 71 states have internal predecessors, (157), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:12:54,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 157 transitions. [2022-11-16 20:12:54,565 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 157 transitions. Word has length 16 [2022-11-16 20:12:54,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:12:54,566 INFO L495 AbstractCegarLoop]: Abstraction has 72 states and 157 transitions. [2022-11-16 20:12:54,566 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 2.25) internal successors, (36), 16 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:12:54,566 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 157 transitions. [2022-11-16 20:12:54,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-11-16 20:12:54,567 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:12:54,567 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:12:54,573 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-16 20:12:54,772 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2022-11-16 20:12:54,773 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:12:54,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:12:54,773 INFO L85 PathProgramCache]: Analyzing trace with hash 437971295, now seen corresponding path program 5 times [2022-11-16 20:12:54,774 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:12:54,774 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [602816541] [2022-11-16 20:12:54,774 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:12:54,774 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:12:54,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:12:54,928 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-16 20:12:54,928 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:12:54,928 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [602816541] [2022-11-16 20:12:54,928 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [602816541] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:12:54,928 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1902993687] [2022-11-16 20:12:54,928 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 20:12:54,929 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:12:54,929 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:12:54,930 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:12:54,958 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-16 20:12:55,034 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-16 20:12:55,035 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:12:55,036 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-16 20:12:55,037 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:12:55,096 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-16 20:12:55,097 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:12:55,156 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-16 20:12:55,157 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1902993687] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:12:55,157 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [510490247] [2022-11-16 20:12:55,158 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:12:55,159 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:12:55,160 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 11 [2022-11-16 20:12:55,160 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1350444459] [2022-11-16 20:12:55,160 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:12:55,161 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-11-16 20:12:55,162 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:12:55,162 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-11-16 20:12:55,162 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2022-11-16 20:12:55,163 INFO L87 Difference]: Start difference. First operand 72 states and 157 transitions. Second operand has 12 states, 12 states have (on average 2.1666666666666665) internal successors, (26), 11 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:12:55,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:12:55,257 INFO L93 Difference]: Finished difference Result 74 states and 154 transitions. [2022-11-16 20:12:55,257 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-16 20:12:55,258 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.1666666666666665) internal successors, (26), 11 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2022-11-16 20:12:55,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:12:55,258 INFO L225 Difference]: With dead ends: 74 [2022-11-16 20:12:55,259 INFO L226 Difference]: Without dead ends: 63 [2022-11-16 20:12:55,259 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 26 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2022-11-16 20:12:55,261 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 23 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 101 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 103 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 101 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-16 20:12:55,261 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 0 Invalid, 103 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 101 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-16 20:12:55,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2022-11-16 20:12:55,271 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2022-11-16 20:12:55,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 62 states have (on average 2.2419354838709675) internal successors, (139), 62 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:12:55,272 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 139 transitions. [2022-11-16 20:12:55,272 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 139 transitions. Word has length 17 [2022-11-16 20:12:55,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:12:55,273 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 139 transitions. [2022-11-16 20:12:55,273 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.1666666666666665) internal successors, (26), 11 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:12:55,273 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 139 transitions. [2022-11-16 20:12:55,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-11-16 20:12:55,275 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:12:55,275 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:12:55,285 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-16 20:12:55,481 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:12:55,481 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:12:55,481 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:12:55,481 INFO L85 PathProgramCache]: Analyzing trace with hash 847157016, now seen corresponding path program 6 times [2022-11-16 20:12:55,481 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:12:55,482 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1992888002] [2022-11-16 20:12:55,482 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:12:55,482 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:12:55,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:12:56,175 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:12:56,175 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:12:56,175 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1992888002] [2022-11-16 20:12:56,175 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1992888002] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:12:56,175 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [168198900] [2022-11-16 20:12:56,175 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 20:12:56,176 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:12:56,176 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:12:56,177 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:12:56,198 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-16 20:12:56,285 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 20:12:56,285 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:12:56,287 INFO L263 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-16 20:12:56,289 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:12:56,363 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 7 [2022-11-16 20:12:56,373 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-16 20:12:56,373 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:12:56,401 INFO L321 Elim1Store]: treesize reduction 5, result has 64.3 percent of original size [2022-11-16 20:12:56,401 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 17 [2022-11-16 20:12:56,429 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-16 20:12:56,429 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [168198900] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:12:56,429 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1165417134] [2022-11-16 20:12:56,430 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:12:56,431 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:12:56,431 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6, 5] total 11 [2022-11-16 20:12:56,431 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1757882153] [2022-11-16 20:12:56,432 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:12:56,432 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-11-16 20:12:56,432 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:12:56,433 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-11-16 20:12:56,433 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=132, Unknown=0, NotChecked=0, Total=156 [2022-11-16 20:12:56,433 INFO L87 Difference]: Start difference. First operand 63 states and 139 transitions. Second operand has 13 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 12 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:12:57,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:12:57,233 INFO L93 Difference]: Finished difference Result 206 states and 444 transitions. [2022-11-16 20:12:57,234 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-11-16 20:12:57,234 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 12 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2022-11-16 20:12:57,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:12:57,235 INFO L225 Difference]: With dead ends: 206 [2022-11-16 20:12:57,235 INFO L226 Difference]: Without dead ends: 155 [2022-11-16 20:12:57,236 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 137 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=135, Invalid=735, Unknown=0, NotChecked=0, Total=870 [2022-11-16 20:12:57,236 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 159 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 398 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 159 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 413 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 398 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-16 20:12:57,237 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [159 Valid, 0 Invalid, 413 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 398 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-16 20:12:57,237 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2022-11-16 20:12:57,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 59. [2022-11-16 20:12:57,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 58 states have (on average 2.1724137931034484) internal successors, (126), 58 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:12:57,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 126 transitions. [2022-11-16 20:12:57,241 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 126 transitions. Word has length 18 [2022-11-16 20:12:57,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:12:57,241 INFO L495 AbstractCegarLoop]: Abstraction has 59 states and 126 transitions. [2022-11-16 20:12:57,241 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 12 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:12:57,242 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 126 transitions. [2022-11-16 20:12:57,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-11-16 20:12:57,243 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:12:57,243 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:12:57,250 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-16 20:12:57,443 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:12:57,444 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:12:57,444 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:12:57,444 INFO L85 PathProgramCache]: Analyzing trace with hash -1241208232, now seen corresponding path program 7 times [2022-11-16 20:12:57,444 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:12:57,445 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2124066328] [2022-11-16 20:12:57,445 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:12:57,445 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:12:57,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:12:58,154 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:12:58,154 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:12:58,154 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2124066328] [2022-11-16 20:12:58,154 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2124066328] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:12:58,154 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [829388517] [2022-11-16 20:12:58,155 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-16 20:12:58,155 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:12:58,155 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:12:58,159 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:12:58,166 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-16 20:12:58,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:12:58,261 INFO L263 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 29 conjunts are in the unsatisfiable core [2022-11-16 20:12:58,263 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:12:58,401 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 20:12:58,401 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 21 [2022-11-16 20:12:58,416 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 7 [2022-11-16 20:12:58,425 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-16 20:12:58,425 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:12:58,450 WARN L833 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_256 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~#t2~0#1.base| v_ArrVal_256) c_~queue~0.base) (+ c_~queue~0.offset (* c_~front~0 4) 4)) 5)) is different from false [2022-11-16 20:12:58,464 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-16 20:12:58,465 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 44 treesize of output 41 [2022-11-16 20:12:58,475 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 3 [2022-11-16 20:12:58,568 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-16 20:12:58,568 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [829388517] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:12:58,568 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2096291966] [2022-11-16 20:12:58,568 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:12:58,569 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:12:58,569 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 7] total 18 [2022-11-16 20:12:58,569 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [533463288] [2022-11-16 20:12:58,569 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:12:58,569 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-16 20:12:58,570 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:12:58,570 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-16 20:12:58,571 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=297, Unknown=1, NotChecked=34, Total=380 [2022-11-16 20:12:58,571 INFO L87 Difference]: Start difference. First operand 59 states and 126 transitions. Second operand has 20 states, 19 states have (on average 1.736842105263158) internal successors, (33), 19 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:12:59,234 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:12:59,234 INFO L93 Difference]: Finished difference Result 128 states and 304 transitions. [2022-11-16 20:12:59,234 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-11-16 20:12:59,234 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 1.736842105263158) internal successors, (33), 19 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2022-11-16 20:12:59,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:12:59,235 INFO L225 Difference]: With dead ends: 128 [2022-11-16 20:12:59,235 INFO L226 Difference]: Without dead ends: 121 [2022-11-16 20:12:59,238 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 1 IntricatePredicates, 1 DeprecatedPredicates, 138 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=166, Invalid=829, Unknown=1, NotChecked=60, Total=1056 [2022-11-16 20:12:59,239 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 93 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 245 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 93 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 322 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 245 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 60 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-16 20:12:59,239 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [93 Valid, 0 Invalid, 322 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 245 Invalid, 0 Unknown, 60 Unchecked, 0.2s Time] [2022-11-16 20:12:59,240 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2022-11-16 20:12:59,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 70. [2022-11-16 20:12:59,243 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 2.347826086956522) internal successors, (162), 69 states have internal predecessors, (162), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:12:59,244 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 162 transitions. [2022-11-16 20:12:59,244 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 162 transitions. Word has length 18 [2022-11-16 20:12:59,244 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:12:59,244 INFO L495 AbstractCegarLoop]: Abstraction has 70 states and 162 transitions. [2022-11-16 20:12:59,245 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 1.736842105263158) internal successors, (33), 19 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:12:59,245 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 162 transitions. [2022-11-16 20:12:59,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-11-16 20:12:59,246 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:12:59,246 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:12:59,254 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-16 20:12:59,452 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:12:59,452 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:12:59,453 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:12:59,453 INFO L85 PathProgramCache]: Analyzing trace with hash 290652032, now seen corresponding path program 8 times [2022-11-16 20:12:59,453 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:12:59,453 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [787705287] [2022-11-16 20:12:59,453 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:12:59,453 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:12:59,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:13:00,112 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:13:00,112 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:13:00,112 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [787705287] [2022-11-16 20:13:00,112 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [787705287] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:13:00,112 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [539996885] [2022-11-16 20:13:00,112 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 20:13:00,112 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:13:00,113 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:13:00,114 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:13:00,135 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-16 20:13:00,224 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-16 20:13:00,224 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:13:00,226 INFO L263 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 37 conjunts are in the unsatisfiable core [2022-11-16 20:13:00,229 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:13:00,450 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 20:13:00,450 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 21 [2022-11-16 20:13:00,547 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 7 [2022-11-16 20:13:00,553 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:13:00,553 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:13:00,581 WARN L833 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_291 (Array Int Int))) (= 5 (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~#t2~0#1.base| v_ArrVal_291) c_~queue~0.base) (+ c_~queue~0.offset (* c_~front~0 4) 4)))) is different from false [2022-11-16 20:13:00,600 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-16 20:13:00,601 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 44 treesize of output 41 [2022-11-16 20:13:00,607 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 3 [2022-11-16 20:13:00,848 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:13:00,848 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [539996885] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:13:00,848 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1861624403] [2022-11-16 20:13:00,848 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:13:00,849 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:13:00,849 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 23 [2022-11-16 20:13:00,849 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [603944450] [2022-11-16 20:13:00,849 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:13:00,849 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-11-16 20:13:00,850 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:13:00,850 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-11-16 20:13:00,850 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=464, Unknown=1, NotChecked=44, Total=600 [2022-11-16 20:13:00,850 INFO L87 Difference]: Start difference. First operand 70 states and 162 transitions. Second operand has 25 states, 24 states have (on average 1.7083333333333333) internal successors, (41), 24 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:13:03,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:13:03,300 INFO L93 Difference]: Finished difference Result 361 states and 879 transitions. [2022-11-16 20:13:03,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2022-11-16 20:13:03,300 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 1.7083333333333333) internal successors, (41), 24 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2022-11-16 20:13:03,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:13:03,303 INFO L225 Difference]: With dead ends: 361 [2022-11-16 20:13:03,303 INFO L226 Difference]: Without dead ends: 341 [2022-11-16 20:13:03,304 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 59 ConstructedPredicates, 1 IntricatePredicates, 8 DeprecatedPredicates, 940 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=543, Invalid=3000, Unknown=1, NotChecked=116, Total=3660 [2022-11-16 20:13:03,305 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 187 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 711 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 187 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 994 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 711 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 242 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-16 20:13:03,306 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [187 Valid, 0 Invalid, 994 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 711 Invalid, 0 Unknown, 242 Unchecked, 0.7s Time] [2022-11-16 20:13:03,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 341 states. [2022-11-16 20:13:03,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 341 to 125. [2022-11-16 20:13:03,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 124 states have (on average 2.717741935483871) internal successors, (337), 124 states have internal predecessors, (337), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:13:03,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 337 transitions. [2022-11-16 20:13:03,315 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 337 transitions. Word has length 18 [2022-11-16 20:13:03,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:13:03,315 INFO L495 AbstractCegarLoop]: Abstraction has 125 states and 337 transitions. [2022-11-16 20:13:03,327 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 1.7083333333333333) internal successors, (41), 24 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:13:03,327 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 337 transitions. [2022-11-16 20:13:03,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-11-16 20:13:03,328 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:13:03,329 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:13:03,345 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-16 20:13:03,546 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:13:03,547 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:13:03,547 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:13:03,547 INFO L85 PathProgramCache]: Analyzing trace with hash 533679960, now seen corresponding path program 9 times [2022-11-16 20:13:03,548 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:13:03,548 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1924910389] [2022-11-16 20:13:03,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:13:03,548 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:13:03,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:13:04,135 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:13:04,135 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:13:04,135 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1924910389] [2022-11-16 20:13:04,135 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1924910389] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:13:04,135 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1798091637] [2022-11-16 20:13:04,136 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 20:13:04,136 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:13:04,136 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:13:04,137 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:13:04,154 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-16 20:13:04,242 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 20:13:04,242 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:13:04,244 INFO L263 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 34 conjunts are in the unsatisfiable core [2022-11-16 20:13:04,246 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:13:04,512 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 20:13:04,513 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 20 [2022-11-16 20:13:04,664 INFO L321 Elim1Store]: treesize reduction 9, result has 25.0 percent of original size [2022-11-16 20:13:04,664 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 10 [2022-11-16 20:13:04,671 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:13:04,672 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:13:04,749 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-16 20:13:04,749 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 27 [2022-11-16 20:13:05,182 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:13:05,182 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1798091637] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:13:05,182 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1681181663] [2022-11-16 20:13:05,183 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:13:05,183 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:13:05,183 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 22 [2022-11-16 20:13:05,183 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1062354297] [2022-11-16 20:13:05,183 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:13:05,184 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-11-16 20:13:05,184 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:13:05,184 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-11-16 20:13:05,184 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=475, Unknown=0, NotChecked=0, Total=552 [2022-11-16 20:13:05,185 INFO L87 Difference]: Start difference. First operand 125 states and 337 transitions. Second operand has 24 states, 23 states have (on average 1.7391304347826086) internal successors, (40), 23 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:13:06,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:13:06,990 INFO L93 Difference]: Finished difference Result 373 states and 1052 transitions. [2022-11-16 20:13:06,991 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-11-16 20:13:06,991 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 1.7391304347826086) internal successors, (40), 23 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2022-11-16 20:13:06,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:13:06,993 INFO L225 Difference]: With dead ends: 373 [2022-11-16 20:13:06,993 INFO L226 Difference]: Without dead ends: 371 [2022-11-16 20:13:06,994 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 431 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=457, Invalid=1895, Unknown=0, NotChecked=0, Total=2352 [2022-11-16 20:13:06,995 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 88 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 505 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 753 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 505 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 209 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-16 20:13:06,995 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [88 Valid, 0 Invalid, 753 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 505 Invalid, 0 Unknown, 209 Unchecked, 0.5s Time] [2022-11-16 20:13:06,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 371 states. [2022-11-16 20:13:07,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 371 to 202. [2022-11-16 20:13:07,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 202 states, 201 states have (on average 2.9751243781094527) internal successors, (598), 201 states have internal predecessors, (598), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:13:07,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 598 transitions. [2022-11-16 20:13:07,015 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 598 transitions. Word has length 18 [2022-11-16 20:13:07,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:13:07,015 INFO L495 AbstractCegarLoop]: Abstraction has 202 states and 598 transitions. [2022-11-16 20:13:07,016 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 1.7391304347826086) internal successors, (40), 23 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:13:07,016 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 598 transitions. [2022-11-16 20:13:07,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-11-16 20:13:07,022 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:13:07,022 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:13:07,034 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-16 20:13:07,233 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-11-16 20:13:07,234 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:13:07,234 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:13:07,234 INFO L85 PathProgramCache]: Analyzing trace with hash 1032381300, now seen corresponding path program 10 times [2022-11-16 20:13:07,234 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:13:07,234 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [827783243] [2022-11-16 20:13:07,234 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:13:07,235 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:13:07,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:13:07,887 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:13:07,887 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:13:07,888 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [827783243] [2022-11-16 20:13:07,888 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [827783243] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:13:07,888 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2056384222] [2022-11-16 20:13:07,888 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-16 20:13:07,888 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:13:07,888 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:13:07,891 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:13:07,909 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-16 20:13:07,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:13:07,995 INFO L263 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 35 conjunts are in the unsatisfiable core [2022-11-16 20:13:07,997 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:13:08,229 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 20:13:08,231 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 21 [2022-11-16 20:13:08,324 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 7 [2022-11-16 20:13:08,330 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:13:08,331 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:13:08,386 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-16 20:13:08,387 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 27 [2022-11-16 20:13:08,639 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:13:08,639 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2056384222] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:13:08,639 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [838015349] [2022-11-16 20:13:08,640 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:13:08,640 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:13:08,640 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 22 [2022-11-16 20:13:08,640 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [342595171] [2022-11-16 20:13:08,640 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:13:08,641 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-11-16 20:13:08,641 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:13:08,641 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-11-16 20:13:08,641 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=472, Unknown=0, NotChecked=0, Total=552 [2022-11-16 20:13:08,642 INFO L87 Difference]: Start difference. First operand 202 states and 598 transitions. Second operand has 24 states, 23 states have (on average 1.7391304347826086) internal successors, (40), 23 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:13:10,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:13:10,221 INFO L93 Difference]: Finished difference Result 548 states and 1434 transitions. [2022-11-16 20:13:10,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-11-16 20:13:10,222 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 1.7391304347826086) internal successors, (40), 23 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2022-11-16 20:13:10,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:13:10,226 INFO L225 Difference]: With dead ends: 548 [2022-11-16 20:13:10,226 INFO L226 Difference]: Without dead ends: 506 [2022-11-16 20:13:10,227 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 330 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=280, Invalid=1442, Unknown=0, NotChecked=0, Total=1722 [2022-11-16 20:13:10,228 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 261 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 860 mSolverCounterSat, 54 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 261 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 914 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 54 IncrementalHoareTripleChecker+Valid, 860 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-16 20:13:10,228 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [261 Valid, 0 Invalid, 914 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [54 Valid, 860 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-16 20:13:10,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 506 states. [2022-11-16 20:13:10,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 506 to 168. [2022-11-16 20:13:10,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 168 states, 167 states have (on average 2.8622754491017965) internal successors, (478), 167 states have internal predecessors, (478), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:13:10,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 478 transitions. [2022-11-16 20:13:10,258 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 478 transitions. Word has length 18 [2022-11-16 20:13:10,258 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:13:10,258 INFO L495 AbstractCegarLoop]: Abstraction has 168 states and 478 transitions. [2022-11-16 20:13:10,258 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 1.7391304347826086) internal successors, (40), 23 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:13:10,258 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 478 transitions. [2022-11-16 20:13:10,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-11-16 20:13:10,259 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:13:10,259 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:13:10,270 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-16 20:13:10,465 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-11-16 20:13:10,465 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:13:10,466 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:13:10,466 INFO L85 PathProgramCache]: Analyzing trace with hash -1040744342, now seen corresponding path program 11 times [2022-11-16 20:13:10,466 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:13:10,466 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1109110323] [2022-11-16 20:13:10,466 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:13:10,466 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:13:10,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:13:10,595 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-16 20:13:10,595 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:13:10,595 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1109110323] [2022-11-16 20:13:10,595 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1109110323] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:13:10,596 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1970061398] [2022-11-16 20:13:10,596 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 20:13:10,596 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:13:10,596 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:13:10,597 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:13:10,620 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-16 20:13:10,720 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-16 20:13:10,720 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:13:10,723 INFO L263 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 39 conjunts are in the unsatisfiable core [2022-11-16 20:13:10,724 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:13:10,918 INFO L321 Elim1Store]: treesize reduction 24, result has 11.1 percent of original size [2022-11-16 20:13:10,919 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 35 treesize of output 13 [2022-11-16 20:13:10,937 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-16 20:13:10,938 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:13:11,127 INFO L321 Elim1Store]: treesize reduction 10, result has 63.0 percent of original size [2022-11-16 20:13:11,127 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 37 treesize of output 28 [2022-11-16 20:13:11,215 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-16 20:13:11,215 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1970061398] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:13:11,215 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1281716392] [2022-11-16 20:13:11,217 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:13:11,218 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:13:11,218 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7, 7] total 17 [2022-11-16 20:13:11,220 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [5019810] [2022-11-16 20:13:11,221 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:13:11,221 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-16 20:13:11,221 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:13:11,222 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-16 20:13:11,222 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=243, Unknown=0, NotChecked=0, Total=306 [2022-11-16 20:13:11,222 INFO L87 Difference]: Start difference. First operand 168 states and 478 transitions. Second operand has 18 states, 18 states have (on average 2.5) internal successors, (45), 17 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:13:12,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:13:12,617 INFO L93 Difference]: Finished difference Result 566 states and 1804 transitions. [2022-11-16 20:13:12,622 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2022-11-16 20:13:12,623 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.5) internal successors, (45), 17 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2022-11-16 20:13:12,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:13:12,629 INFO L225 Difference]: With dead ends: 566 [2022-11-16 20:13:12,629 INFO L226 Difference]: Without dead ends: 549 [2022-11-16 20:13:12,630 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 32 SyntacticMatches, 1 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 782 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=729, Invalid=2351, Unknown=0, NotChecked=0, Total=3080 [2022-11-16 20:13:12,631 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 192 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 187 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 192 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 621 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 187 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 413 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-16 20:13:12,631 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [192 Valid, 0 Invalid, 621 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 187 Invalid, 0 Unknown, 413 Unchecked, 0.2s Time] [2022-11-16 20:13:12,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 549 states. [2022-11-16 20:13:12,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 549 to 326. [2022-11-16 20:13:12,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 326 states, 325 states have (on average 3.046153846153846) internal successors, (990), 325 states have internal predecessors, (990), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:13:12,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 326 states to 326 states and 990 transitions. [2022-11-16 20:13:12,647 INFO L78 Accepts]: Start accepts. Automaton has 326 states and 990 transitions. Word has length 19 [2022-11-16 20:13:12,648 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:13:12,648 INFO L495 AbstractCegarLoop]: Abstraction has 326 states and 990 transitions. [2022-11-16 20:13:12,648 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 2.5) internal successors, (45), 17 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:13:12,648 INFO L276 IsEmpty]: Start isEmpty. Operand 326 states and 990 transitions. [2022-11-16 20:13:12,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-11-16 20:13:12,650 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:13:12,651 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:13:12,658 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-16 20:13:12,856 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-11-16 20:13:12,856 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:13:12,856 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:13:12,856 INFO L85 PathProgramCache]: Analyzing trace with hash 491115922, now seen corresponding path program 12 times [2022-11-16 20:13:12,856 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:13:12,856 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1868946419] [2022-11-16 20:13:12,857 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:13:12,857 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:13:12,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:13:12,975 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-16 20:13:12,975 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:13:12,975 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1868946419] [2022-11-16 20:13:12,976 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1868946419] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:13:12,976 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1018244206] [2022-11-16 20:13:12,976 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 20:13:12,976 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:13:12,976 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:13:12,979 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:13:12,995 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-16 20:13:13,094 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 20:13:13,094 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:13:13,096 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-16 20:13:13,097 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:13:13,127 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 7 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-16 20:13:13,128 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:13:13,230 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-16 20:13:13,230 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1018244206] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:13:13,231 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1598140567] [2022-11-16 20:13:13,231 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:13:13,232 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:13:13,233 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 6] total 10 [2022-11-16 20:13:13,233 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [429848130] [2022-11-16 20:13:13,233 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:13:13,233 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-11-16 20:13:13,233 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:13:13,234 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-11-16 20:13:13,234 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2022-11-16 20:13:13,234 INFO L87 Difference]: Start difference. First operand 326 states and 990 transitions. Second operand has 11 states, 11 states have (on average 3.4545454545454546) internal successors, (38), 10 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:13:13,335 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:13:13,335 INFO L93 Difference]: Finished difference Result 499 states and 1438 transitions. [2022-11-16 20:13:13,335 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-16 20:13:13,336 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.4545454545454546) internal successors, (38), 10 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2022-11-16 20:13:13,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:13:13,338 INFO L225 Difference]: With dead ends: 499 [2022-11-16 20:13:13,338 INFO L226 Difference]: Without dead ends: 485 [2022-11-16 20:13:13,340 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2022-11-16 20:13:13,342 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 60 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 109 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 118 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 109 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-16 20:13:13,343 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [60 Valid, 0 Invalid, 118 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 109 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-16 20:13:13,345 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 485 states. [2022-11-16 20:13:13,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 485 to 438. [2022-11-16 20:13:13,357 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 438 states, 437 states have (on average 2.919908466819222) internal successors, (1276), 437 states have internal predecessors, (1276), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:13:13,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 438 states to 438 states and 1276 transitions. [2022-11-16 20:13:13,360 INFO L78 Accepts]: Start accepts. Automaton has 438 states and 1276 transitions. Word has length 19 [2022-11-16 20:13:13,360 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:13:13,360 INFO L495 AbstractCegarLoop]: Abstraction has 438 states and 1276 transitions. [2022-11-16 20:13:13,360 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 3.4545454545454546) internal successors, (38), 10 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:13:13,360 INFO L276 IsEmpty]: Start isEmpty. Operand 438 states and 1276 transitions. [2022-11-16 20:13:13,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-11-16 20:13:13,364 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:13:13,364 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:13:13,374 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2022-11-16 20:13:13,569 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:13:13,570 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:13:13,570 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:13:13,570 INFO L85 PathProgramCache]: Analyzing trace with hash 1697303379, now seen corresponding path program 13 times [2022-11-16 20:13:13,570 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:13:13,571 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1554577216] [2022-11-16 20:13:13,571 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:13:13,571 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:13:13,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:13:13,729 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-16 20:13:13,729 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:13:13,729 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1554577216] [2022-11-16 20:13:13,729 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1554577216] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:13:13,729 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [801885118] [2022-11-16 20:13:13,730 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-16 20:13:13,730 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:13:13,730 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:13:13,731 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:13:13,759 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-16 20:13:13,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:13:13,848 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-16 20:13:13,849 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:13:13,942 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-16 20:13:13,942 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:13:14,064 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-16 20:13:14,065 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [801885118] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:13:14,065 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1350415190] [2022-11-16 20:13:14,065 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:13:14,066 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:13:14,066 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 17 [2022-11-16 20:13:14,066 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [766098827] [2022-11-16 20:13:14,066 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:13:14,066 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-16 20:13:14,066 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:13:14,067 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-16 20:13:14,067 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=224, Unknown=0, NotChecked=0, Total=306 [2022-11-16 20:13:14,067 INFO L87 Difference]: Start difference. First operand 438 states and 1276 transitions. Second operand has 18 states, 18 states have (on average 1.7777777777777777) internal successors, (32), 17 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:13:14,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:13:14,219 INFO L93 Difference]: Finished difference Result 161 states and 335 transitions. [2022-11-16 20:13:14,219 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-16 20:13:14,219 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.7777777777777777) internal successors, (32), 17 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2022-11-16 20:13:14,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:13:14,220 INFO L225 Difference]: With dead ends: 161 [2022-11-16 20:13:14,220 INFO L226 Difference]: Without dead ends: 116 [2022-11-16 20:13:14,220 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 28 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=118, Invalid=302, Unknown=0, NotChecked=0, Total=420 [2022-11-16 20:13:14,221 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 36 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 143 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 147 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 143 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-16 20:13:14,221 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [36 Valid, 0 Invalid, 147 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 143 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-16 20:13:14,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2022-11-16 20:13:14,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 116. [2022-11-16 20:13:14,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 115 states have (on average 2.356521739130435) internal successors, (271), 115 states have internal predecessors, (271), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:13:14,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 271 transitions. [2022-11-16 20:13:14,225 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 271 transitions. Word has length 20 [2022-11-16 20:13:14,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:13:14,226 INFO L495 AbstractCegarLoop]: Abstraction has 116 states and 271 transitions. [2022-11-16 20:13:14,226 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 1.7777777777777777) internal successors, (32), 17 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:13:14,226 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 271 transitions. [2022-11-16 20:13:14,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-11-16 20:13:14,226 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:13:14,226 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:13:14,238 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-16 20:13:14,427 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-16 20:13:14,427 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:13:14,428 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:13:14,428 INFO L85 PathProgramCache]: Analyzing trace with hash 1100071378, now seen corresponding path program 14 times [2022-11-16 20:13:14,428 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:13:14,429 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [104402997] [2022-11-16 20:13:14,429 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:13:14,429 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:13:14,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:13:15,001 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:13:15,001 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:13:15,001 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [104402997] [2022-11-16 20:13:15,002 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [104402997] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:13:15,002 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2125313611] [2022-11-16 20:13:15,002 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 20:13:15,002 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:13:15,002 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:13:15,006 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:13:15,034 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-16 20:13:15,258 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-16 20:13:15,258 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:13:15,260 INFO L263 TraceCheckSpWp]: Trace formula consists of 230 conjuncts, 36 conjunts are in the unsatisfiable core [2022-11-16 20:13:15,262 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:13:15,681 INFO L321 Elim1Store]: treesize reduction 9, result has 25.0 percent of original size [2022-11-16 20:13:15,682 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 10 [2022-11-16 20:13:15,692 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:13:15,693 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:13:15,879 INFO L321 Elim1Store]: treesize reduction 5, result has 58.3 percent of original size [2022-11-16 20:13:15,880 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 24 treesize of output 15 [2022-11-16 20:13:16,421 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 3 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:13:16,421 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2125313611] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:13:16,422 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1606729632] [2022-11-16 20:13:16,422 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:13:16,423 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:13:16,423 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 31 [2022-11-16 20:13:16,424 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [859563259] [2022-11-16 20:13:16,424 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:13:16,424 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-11-16 20:13:16,424 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:13:16,425 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-11-16 20:13:16,425 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=182, Invalid=874, Unknown=0, NotChecked=0, Total=1056 [2022-11-16 20:13:16,425 INFO L87 Difference]: Start difference. First operand 116 states and 271 transitions. Second operand has 33 states, 32 states have (on average 1.59375) internal successors, (51), 32 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:13:20,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:13:20,050 INFO L93 Difference]: Finished difference Result 404 states and 1178 transitions. [2022-11-16 20:13:20,051 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2022-11-16 20:13:20,051 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 32 states have (on average 1.59375) internal successors, (51), 32 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2022-11-16 20:13:20,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:13:20,053 INFO L225 Difference]: With dead ends: 404 [2022-11-16 20:13:20,054 INFO L226 Difference]: Without dead ends: 393 [2022-11-16 20:13:20,055 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1122 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=932, Invalid=4470, Unknown=0, NotChecked=0, Total=5402 [2022-11-16 20:13:20,056 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 80 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 289 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 80 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 798 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 289 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 476 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-16 20:13:20,056 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [80 Valid, 0 Invalid, 798 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 289 Invalid, 0 Unknown, 476 Unchecked, 0.3s Time] [2022-11-16 20:13:20,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 393 states. [2022-11-16 20:13:20,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 393 to 204. [2022-11-16 20:13:20,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 204 states, 203 states have (on average 2.684729064039409) internal successors, (545), 203 states have internal predecessors, (545), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:13:20,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 545 transitions. [2022-11-16 20:13:20,066 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 545 transitions. Word has length 21 [2022-11-16 20:13:20,066 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:13:20,067 INFO L495 AbstractCegarLoop]: Abstraction has 204 states and 545 transitions. [2022-11-16 20:13:20,067 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 32 states have (on average 1.59375) internal successors, (51), 32 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:13:20,067 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 545 transitions. [2022-11-16 20:13:20,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-11-16 20:13:20,068 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:13:20,068 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:13:20,078 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-16 20:13:20,273 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-16 20:13:20,273 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:13:20,274 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:13:20,274 INFO L85 PathProgramCache]: Analyzing trace with hash -1663035654, now seen corresponding path program 15 times [2022-11-16 20:13:20,274 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:13:20,274 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [481476768] [2022-11-16 20:13:20,274 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:13:20,274 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:13:20,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:13:20,788 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 1 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:13:20,788 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:13:20,788 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [481476768] [2022-11-16 20:13:20,788 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [481476768] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:13:20,789 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [755919266] [2022-11-16 20:13:20,789 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 20:13:20,789 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:13:20,789 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:13:20,790 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:13:20,795 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-16 20:13:20,907 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 20:13:20,907 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:13:20,909 INFO L263 TraceCheckSpWp]: Trace formula consists of 230 conjuncts, 35 conjunts are in the unsatisfiable core [2022-11-16 20:13:20,910 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:13:21,239 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 7 [2022-11-16 20:13:21,249 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:13:21,249 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:13:21,285 INFO L321 Elim1Store]: treesize reduction 5, result has 64.3 percent of original size [2022-11-16 20:13:21,285 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 17 [2022-11-16 20:13:21,573 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:13:21,573 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [755919266] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:13:21,573 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1936371338] [2022-11-16 20:13:21,574 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:13:21,574 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:13:21,574 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 28 [2022-11-16 20:13:21,574 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1123999917] [2022-11-16 20:13:21,574 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:13:21,575 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-11-16 20:13:21,575 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:13:21,575 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-11-16 20:13:21,576 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=712, Unknown=0, NotChecked=0, Total=870 [2022-11-16 20:13:21,576 INFO L87 Difference]: Start difference. First operand 204 states and 545 transitions. Second operand has 30 states, 29 states have (on average 1.7241379310344827) internal successors, (50), 29 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:13:26,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:13:26,077 INFO L93 Difference]: Finished difference Result 1536 states and 3750 transitions. [2022-11-16 20:13:26,078 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 93 states. [2022-11-16 20:13:26,078 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 29 states have (on average 1.7241379310344827) internal successors, (50), 29 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2022-11-16 20:13:26,078 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:13:26,085 INFO L225 Difference]: With dead ends: 1536 [2022-11-16 20:13:26,086 INFO L226 Difference]: Without dead ends: 1382 [2022-11-16 20:13:26,089 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3639 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=1838, Invalid=10372, Unknown=0, NotChecked=0, Total=12210 [2022-11-16 20:13:26,089 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 469 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 2442 mSolverCounterSat, 83 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 469 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 2525 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 83 IncrementalHoareTripleChecker+Valid, 2442 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2022-11-16 20:13:26,090 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [469 Valid, 0 Invalid, 2525 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [83 Valid, 2442 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2022-11-16 20:13:26,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1382 states. [2022-11-16 20:13:26,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1382 to 396. [2022-11-16 20:13:26,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 396 states, 395 states have (on average 3.09873417721519) internal successors, (1224), 395 states have internal predecessors, (1224), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:13:26,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 396 states to 396 states and 1224 transitions. [2022-11-16 20:13:26,115 INFO L78 Accepts]: Start accepts. Automaton has 396 states and 1224 transitions. Word has length 21 [2022-11-16 20:13:26,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:13:26,116 INFO L495 AbstractCegarLoop]: Abstraction has 396 states and 1224 transitions. [2022-11-16 20:13:26,116 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 29 states have (on average 1.7241379310344827) internal successors, (50), 29 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:13:26,116 INFO L276 IsEmpty]: Start isEmpty. Operand 396 states and 1224 transitions. [2022-11-16 20:13:26,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-11-16 20:13:26,118 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:13:26,118 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:13:26,127 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2022-11-16 20:13:26,323 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-16 20:13:26,323 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:13:26,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:13:26,324 INFO L85 PathProgramCache]: Analyzing trace with hash -1203645942, now seen corresponding path program 16 times [2022-11-16 20:13:26,324 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:13:26,324 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [245066536] [2022-11-16 20:13:26,324 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:13:26,324 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:13:26,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:13:26,875 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 1 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:13:26,875 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:13:26,875 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [245066536] [2022-11-16 20:13:26,875 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [245066536] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:13:26,876 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1144276492] [2022-11-16 20:13:26,876 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-16 20:13:26,876 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:13:26,876 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:13:26,877 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:13:26,906 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-16 20:13:27,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:13:27,009 INFO L263 TraceCheckSpWp]: Trace formula consists of 230 conjuncts, 33 conjunts are in the unsatisfiable core [2022-11-16 20:13:27,011 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:13:27,377 INFO L321 Elim1Store]: treesize reduction 9, result has 25.0 percent of original size [2022-11-16 20:13:27,377 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 10 [2022-11-16 20:13:27,388 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:13:27,388 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:13:27,421 INFO L321 Elim1Store]: treesize reduction 5, result has 64.3 percent of original size [2022-11-16 20:13:27,422 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 17 [2022-11-16 20:13:27,938 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 1 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:13:27,938 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1144276492] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:13:27,938 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1455344003] [2022-11-16 20:13:27,939 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:13:27,940 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:13:27,940 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 29 [2022-11-16 20:13:27,940 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [856186055] [2022-11-16 20:13:27,940 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:13:27,941 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-11-16 20:13:27,941 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:13:27,941 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-11-16 20:13:27,942 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=759, Unknown=0, NotChecked=0, Total=930 [2022-11-16 20:13:27,942 INFO L87 Difference]: Start difference. First operand 396 states and 1224 transitions. Second operand has 31 states, 30 states have (on average 1.6333333333333333) internal successors, (49), 30 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:13:29,515 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:13:29,515 INFO L93 Difference]: Finished difference Result 509 states and 1094 transitions. [2022-11-16 20:13:29,515 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2022-11-16 20:13:29,516 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 30 states have (on average 1.6333333333333333) internal successors, (49), 30 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2022-11-16 20:13:29,516 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:13:29,518 INFO L225 Difference]: With dead ends: 509 [2022-11-16 20:13:29,519 INFO L226 Difference]: Without dead ends: 473 [2022-11-16 20:13:29,520 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 949 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=855, Invalid=3435, Unknown=0, NotChecked=0, Total=4290 [2022-11-16 20:13:29,520 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 259 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 493 mSolverCounterSat, 89 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 259 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 780 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 89 IncrementalHoareTripleChecker+Valid, 493 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 198 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-16 20:13:29,521 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [259 Valid, 0 Invalid, 780 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [89 Valid, 493 Invalid, 0 Unknown, 198 Unchecked, 0.4s Time] [2022-11-16 20:13:29,522 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 473 states. [2022-11-16 20:13:29,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 473 to 242. [2022-11-16 20:13:29,530 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 242 states, 241 states have (on average 2.4149377593360994) internal successors, (582), 241 states have internal predecessors, (582), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:13:29,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 242 states to 242 states and 582 transitions. [2022-11-16 20:13:29,531 INFO L78 Accepts]: Start accepts. Automaton has 242 states and 582 transitions. Word has length 21 [2022-11-16 20:13:29,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:13:29,532 INFO L495 AbstractCegarLoop]: Abstraction has 242 states and 582 transitions. [2022-11-16 20:13:29,532 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 30 states have (on average 1.6333333333333333) internal successors, (49), 30 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:13:29,532 INFO L276 IsEmpty]: Start isEmpty. Operand 242 states and 582 transitions. [2022-11-16 20:13:29,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-11-16 20:13:29,533 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:13:29,533 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:13:29,538 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-11-16 20:13:29,738 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:13:29,738 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:13:29,739 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:13:29,739 INFO L85 PathProgramCache]: Analyzing trace with hash 571242250, now seen corresponding path program 17 times [2022-11-16 20:13:29,739 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:13:29,739 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [535747758] [2022-11-16 20:13:29,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:13:29,739 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:13:29,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:13:30,334 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 1 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:13:30,335 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:13:30,335 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [535747758] [2022-11-16 20:13:30,335 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [535747758] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:13:30,335 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [822688421] [2022-11-16 20:13:30,335 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 20:13:30,335 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:13:30,335 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:13:30,336 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:13:30,339 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-16 20:13:30,656 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-16 20:13:30,656 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:13:30,658 INFO L263 TraceCheckSpWp]: Trace formula consists of 230 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-16 20:13:30,659 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:13:30,838 INFO L321 Elim1Store]: treesize reduction 9, result has 25.0 percent of original size [2022-11-16 20:13:30,838 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 10 [2022-11-16 20:13:30,844 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-16 20:13:30,844 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:13:30,982 INFO L321 Elim1Store]: treesize reduction 5, result has 58.3 percent of original size [2022-11-16 20:13:30,982 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 24 treesize of output 15 [2022-11-16 20:13:31,127 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-16 20:13:31,128 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [822688421] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:13:31,128 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1837774553] [2022-11-16 20:13:31,128 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:13:31,130 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:13:31,130 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 6, 7] total 22 [2022-11-16 20:13:31,131 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2134800863] [2022-11-16 20:13:31,131 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:13:31,131 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-11-16 20:13:31,131 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:13:31,131 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-11-16 20:13:31,132 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=454, Unknown=0, NotChecked=0, Total=552 [2022-11-16 20:13:31,132 INFO L87 Difference]: Start difference. First operand 242 states and 582 transitions. Second operand has 24 states, 23 states have (on average 2.3043478260869565) internal successors, (53), 23 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:13:31,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:13:31,934 INFO L93 Difference]: Finished difference Result 459 states and 1059 transitions. [2022-11-16 20:13:31,935 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-11-16 20:13:31,935 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 2.3043478260869565) internal successors, (53), 23 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2022-11-16 20:13:31,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:13:31,937 INFO L225 Difference]: With dead ends: 459 [2022-11-16 20:13:31,937 INFO L226 Difference]: Without dead ends: 430 [2022-11-16 20:13:31,938 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=432, Invalid=1638, Unknown=0, NotChecked=0, Total=2070 [2022-11-16 20:13:31,938 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 122 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 236 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 122 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 476 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 236 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 225 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-16 20:13:31,939 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [122 Valid, 0 Invalid, 476 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 236 Invalid, 0 Unknown, 225 Unchecked, 0.2s Time] [2022-11-16 20:13:31,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 430 states. [2022-11-16 20:13:31,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 430 to 279. [2022-11-16 20:13:31,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 279 states, 278 states have (on average 2.460431654676259) internal successors, (684), 278 states have internal predecessors, (684), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:13:31,951 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 279 states to 279 states and 684 transitions. [2022-11-16 20:13:31,951 INFO L78 Accepts]: Start accepts. Automaton has 279 states and 684 transitions. Word has length 21 [2022-11-16 20:13:31,951 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:13:31,951 INFO L495 AbstractCegarLoop]: Abstraction has 279 states and 684 transitions. [2022-11-16 20:13:31,951 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 2.3043478260869565) internal successors, (53), 23 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:13:31,952 INFO L276 IsEmpty]: Start isEmpty. Operand 279 states and 684 transitions. [2022-11-16 20:13:31,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-11-16 20:13:31,952 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:13:31,953 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:13:31,964 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-11-16 20:13:32,158 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:13:32,159 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:13:32,159 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:13:32,159 INFO L85 PathProgramCache]: Analyzing trace with hash -805438828, now seen corresponding path program 18 times [2022-11-16 20:13:32,159 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:13:32,159 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1203211430] [2022-11-16 20:13:32,159 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:13:32,160 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:13:32,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:13:32,685 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:13:32,685 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:13:32,685 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1203211430] [2022-11-16 20:13:32,685 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1203211430] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:13:32,685 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [890971180] [2022-11-16 20:13:32,685 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 20:13:32,686 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:13:32,686 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:13:32,687 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:13:32,714 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-16 20:13:32,816 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 20:13:32,816 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:13:32,818 INFO L263 TraceCheckSpWp]: Trace formula consists of 230 conjuncts, 35 conjunts are in the unsatisfiable core [2022-11-16 20:13:32,819 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:13:33,131 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 7 [2022-11-16 20:13:33,140 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 1 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:13:33,140 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:13:33,165 INFO L321 Elim1Store]: treesize reduction 5, result has 58.3 percent of original size [2022-11-16 20:13:33,166 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 24 treesize of output 15 [2022-11-16 20:13:33,477 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 1 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:13:33,478 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [890971180] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:13:33,478 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [642267410] [2022-11-16 20:13:33,478 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:13:33,479 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:13:33,480 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 30 [2022-11-16 20:13:33,480 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [881660404] [2022-11-16 20:13:33,480 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:13:33,480 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-11-16 20:13:33,480 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:13:33,481 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-11-16 20:13:33,481 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=780, Unknown=0, NotChecked=0, Total=992 [2022-11-16 20:13:33,481 INFO L87 Difference]: Start difference. First operand 279 states and 684 transitions. Second operand has 32 states, 31 states have (on average 1.6129032258064515) internal successors, (50), 31 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:13:34,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:13:34,972 INFO L93 Difference]: Finished difference Result 615 states and 1345 transitions. [2022-11-16 20:13:34,972 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2022-11-16 20:13:34,973 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 31 states have (on average 1.6129032258064515) internal successors, (50), 31 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2022-11-16 20:13:34,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:13:34,975 INFO L225 Difference]: With dead ends: 615 [2022-11-16 20:13:34,976 INFO L226 Difference]: Without dead ends: 528 [2022-11-16 20:13:34,977 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1071 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=702, Invalid=3330, Unknown=0, NotChecked=0, Total=4032 [2022-11-16 20:13:34,977 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 352 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 857 mSolverCounterSat, 72 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 352 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 929 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 72 IncrementalHoareTripleChecker+Valid, 857 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-16 20:13:34,978 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [352 Valid, 0 Invalid, 929 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [72 Valid, 857 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-16 20:13:34,979 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 528 states. [2022-11-16 20:13:34,987 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 528 to 268. [2022-11-16 20:13:34,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 268 states, 267 states have (on average 2.4831460674157304) internal successors, (663), 267 states have internal predecessors, (663), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:13:34,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 268 states to 268 states and 663 transitions. [2022-11-16 20:13:34,989 INFO L78 Accepts]: Start accepts. Automaton has 268 states and 663 transitions. Word has length 21 [2022-11-16 20:13:34,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:13:34,989 INFO L495 AbstractCegarLoop]: Abstraction has 268 states and 663 transitions. [2022-11-16 20:13:34,989 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 31 states have (on average 1.6129032258064515) internal successors, (50), 31 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:13:34,990 INFO L276 IsEmpty]: Start isEmpty. Operand 268 states and 663 transitions. [2022-11-16 20:13:34,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-11-16 20:13:34,990 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:13:34,991 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:13:35,004 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-11-16 20:13:35,196 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:13:35,196 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:13:35,196 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:13:35,196 INFO L85 PathProgramCache]: Analyzing trace with hash -621152172, now seen corresponding path program 19 times [2022-11-16 20:13:35,196 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:13:35,196 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [293647022] [2022-11-16 20:13:35,196 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:13:35,196 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:13:35,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:13:35,701 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 1 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:13:35,701 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:13:35,702 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [293647022] [2022-11-16 20:13:35,702 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [293647022] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:13:35,702 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1789654635] [2022-11-16 20:13:35,702 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-16 20:13:35,702 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:13:35,702 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:13:35,707 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:13:35,730 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-16 20:13:35,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:13:35,836 INFO L263 TraceCheckSpWp]: Trace formula consists of 230 conjuncts, 33 conjunts are in the unsatisfiable core [2022-11-16 20:13:35,838 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:13:36,174 INFO L321 Elim1Store]: treesize reduction 9, result has 25.0 percent of original size [2022-11-16 20:13:36,175 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 10 [2022-11-16 20:13:36,184 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:13:36,184 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:13:36,210 INFO L321 Elim1Store]: treesize reduction 5, result has 64.3 percent of original size [2022-11-16 20:13:36,210 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 17 [2022-11-16 20:13:36,680 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 1 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:13:36,681 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1789654635] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:13:36,681 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1887075867] [2022-11-16 20:13:36,681 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:13:36,682 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:13:36,682 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 29 [2022-11-16 20:13:36,682 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1581331433] [2022-11-16 20:13:36,682 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:13:36,682 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-11-16 20:13:36,682 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:13:36,683 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-11-16 20:13:36,683 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=759, Unknown=0, NotChecked=0, Total=930 [2022-11-16 20:13:36,683 INFO L87 Difference]: Start difference. First operand 268 states and 663 transitions. Second operand has 31 states, 30 states have (on average 1.6) internal successors, (48), 30 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:13:38,035 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:13:38,035 INFO L93 Difference]: Finished difference Result 466 states and 1040 transitions. [2022-11-16 20:13:38,035 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-11-16 20:13:38,036 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 30 states have (on average 1.6) internal successors, (48), 30 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2022-11-16 20:13:38,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:13:38,038 INFO L225 Difference]: With dead ends: 466 [2022-11-16 20:13:38,038 INFO L226 Difference]: Without dead ends: 400 [2022-11-16 20:13:38,040 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 793 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=725, Invalid=2935, Unknown=0, NotChecked=0, Total=3660 [2022-11-16 20:13:38,040 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 363 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 457 mSolverCounterSat, 90 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 363 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 817 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 90 IncrementalHoareTripleChecker+Valid, 457 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 270 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-16 20:13:38,040 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [363 Valid, 0 Invalid, 817 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [90 Valid, 457 Invalid, 0 Unknown, 270 Unchecked, 0.4s Time] [2022-11-16 20:13:38,042 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 400 states. [2022-11-16 20:13:38,047 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 400 to 247. [2022-11-16 20:13:38,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 247 states, 246 states have (on average 2.524390243902439) internal successors, (621), 246 states have internal predecessors, (621), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:13:38,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 247 states to 247 states and 621 transitions. [2022-11-16 20:13:38,049 INFO L78 Accepts]: Start accepts. Automaton has 247 states and 621 transitions. Word has length 21 [2022-11-16 20:13:38,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:13:38,050 INFO L495 AbstractCegarLoop]: Abstraction has 247 states and 621 transitions. [2022-11-16 20:13:38,050 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 30 states have (on average 1.6) internal successors, (48), 30 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:13:38,050 INFO L276 IsEmpty]: Start isEmpty. Operand 247 states and 621 transitions. [2022-11-16 20:13:38,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-11-16 20:13:38,051 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:13:38,051 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:13:38,058 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-11-16 20:13:38,256 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2022-11-16 20:13:38,256 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:13:38,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:13:38,257 INFO L85 PathProgramCache]: Analyzing trace with hash 592046008, now seen corresponding path program 20 times [2022-11-16 20:13:38,257 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:13:38,257 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [375684343] [2022-11-16 20:13:38,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:13:38,257 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:13:38,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:13:38,840 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 1 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:13:38,840 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:13:38,840 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [375684343] [2022-11-16 20:13:38,840 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [375684343] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:13:38,840 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1793626157] [2022-11-16 20:13:38,841 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 20:13:38,841 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:13:38,841 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:13:38,842 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:13:38,847 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-16 20:13:39,096 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-16 20:13:39,096 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:13:39,099 INFO L263 TraceCheckSpWp]: Trace formula consists of 230 conjuncts, 43 conjunts are in the unsatisfiable core [2022-11-16 20:13:39,100 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:13:39,428 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 20:13:39,428 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 20 [2022-11-16 20:13:39,612 INFO L321 Elim1Store]: treesize reduction 9, result has 25.0 percent of original size [2022-11-16 20:13:39,612 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 10 [2022-11-16 20:13:39,621 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:13:39,621 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:13:39,893 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-16 20:13:39,893 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 38 [2022-11-16 20:13:39,900 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 7 [2022-11-16 20:13:41,101 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 3 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:13:41,101 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1793626157] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:13:41,101 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [890140851] [2022-11-16 20:13:41,102 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:13:41,102 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:13:41,102 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 34 [2022-11-16 20:13:41,102 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [524789085] [2022-11-16 20:13:41,102 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:13:41,103 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-11-16 20:13:41,103 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:13:41,103 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-11-16 20:13:41,103 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=1074, Unknown=1, NotChecked=0, Total=1260 [2022-11-16 20:13:41,104 INFO L87 Difference]: Start difference. First operand 247 states and 621 transitions. Second operand has 36 states, 35 states have (on average 1.457142857142857) internal successors, (51), 35 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:14:07,720 WARN L233 SmtUtils]: Spent 25.98s on a formula simplification. DAG size of input: 56 DAG size of output: 48 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-16 20:14:57,066 WARN L233 SmtUtils]: Spent 49.10s on a formula simplification. DAG size of input: 64 DAG size of output: 61 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-16 20:14:57,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:14:57,223 INFO L93 Difference]: Finished difference Result 359 states and 859 transitions. [2022-11-16 20:14:57,223 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-11-16 20:14:57,224 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 35 states have (on average 1.457142857142857) internal successors, (51), 35 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2022-11-16 20:14:57,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:14:57,226 INFO L225 Difference]: With dead ends: 359 [2022-11-16 20:14:57,226 INFO L226 Difference]: Without dead ends: 352 [2022-11-16 20:14:57,227 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 595 ImplicationChecksByTransitivity, 77.4s TimeCoverageRelationStatistics Valid=419, Invalid=2336, Unknown=1, NotChecked=0, Total=2756 [2022-11-16 20:14:57,227 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 69 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 303 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 682 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 303 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 360 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-16 20:14:57,228 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [69 Valid, 0 Invalid, 682 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 303 Invalid, 0 Unknown, 360 Unchecked, 0.2s Time] [2022-11-16 20:14:57,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 352 states. [2022-11-16 20:14:57,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 352 to 233. [2022-11-16 20:14:57,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 233 states, 232 states have (on average 2.5258620689655173) internal successors, (586), 232 states have internal predecessors, (586), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:14:57,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 233 states to 233 states and 586 transitions. [2022-11-16 20:14:57,235 INFO L78 Accepts]: Start accepts. Automaton has 233 states and 586 transitions. Word has length 21 [2022-11-16 20:14:57,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:14:57,235 INFO L495 AbstractCegarLoop]: Abstraction has 233 states and 586 transitions. [2022-11-16 20:14:57,236 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 35 states have (on average 1.457142857142857) internal successors, (51), 35 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:14:57,236 INFO L276 IsEmpty]: Start isEmpty. Operand 233 states and 586 transitions. [2022-11-16 20:14:57,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-11-16 20:14:57,236 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:14:57,237 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:14:57,245 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2022-11-16 20:14:57,445 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2022-11-16 20:14:57,445 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:14:57,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:14:57,446 INFO L85 PathProgramCache]: Analyzing trace with hash 2123906272, now seen corresponding path program 21 times [2022-11-16 20:14:57,446 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:14:57,446 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1241181309] [2022-11-16 20:14:57,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:14:57,446 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:14:57,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:14:58,108 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 1 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:14:58,109 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:14:58,109 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1241181309] [2022-11-16 20:14:58,109 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1241181309] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:14:58,109 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1445944949] [2022-11-16 20:14:58,109 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 20:14:58,109 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:14:58,109 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:14:58,111 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:14:58,138 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-11-16 20:14:58,251 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 20:14:58,251 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:14:58,253 INFO L263 TraceCheckSpWp]: Trace formula consists of 230 conjuncts, 40 conjunts are in the unsatisfiable core [2022-11-16 20:14:58,255 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:14:58,626 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 20:14:58,627 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 21 [2022-11-16 20:14:58,772 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 7 [2022-11-16 20:14:58,780 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:14:58,780 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:14:58,808 WARN L833 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_769 (Array Int Int))) (= 5 (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~#t2~0#1.base| v_ArrVal_769) c_~queue~0.base) (+ c_~queue~0.offset (* c_~front~0 4) 8)))) is different from false [2022-11-16 20:14:58,826 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-16 20:14:58,827 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 44 treesize of output 41 [2022-11-16 20:14:58,838 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 3 [2022-11-16 20:14:59,228 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:14:59,229 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1445944949] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:14:59,229 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1202259181] [2022-11-16 20:14:59,230 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:14:59,231 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:14:59,231 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 31 [2022-11-16 20:14:59,231 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1026580050] [2022-11-16 20:14:59,232 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:14:59,232 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-11-16 20:14:59,232 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:14:59,232 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-11-16 20:14:59,233 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=852, Unknown=1, NotChecked=60, Total=1056 [2022-11-16 20:14:59,233 INFO L87 Difference]: Start difference. First operand 233 states and 586 transitions. Second operand has 33 states, 32 states have (on average 1.53125) internal successors, (49), 32 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:15:01,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:15:01,311 INFO L93 Difference]: Finished difference Result 632 states and 1487 transitions. [2022-11-16 20:15:01,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-11-16 20:15:01,312 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 32 states have (on average 1.53125) internal successors, (49), 32 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2022-11-16 20:15:01,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:15:01,315 INFO L225 Difference]: With dead ends: 632 [2022-11-16 20:15:01,315 INFO L226 Difference]: Without dead ends: 619 [2022-11-16 20:15:01,315 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 22 SyntacticMatches, 2 SemanticMatches, 51 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 637 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=431, Invalid=2224, Unknown=1, NotChecked=100, Total=2756 [2022-11-16 20:15:01,316 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 279 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 1071 mSolverCounterSat, 54 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 279 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 1197 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 54 IncrementalHoareTripleChecker+Valid, 1071 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 72 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-16 20:15:01,316 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [279 Valid, 0 Invalid, 1197 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [54 Valid, 1071 Invalid, 0 Unknown, 72 Unchecked, 0.9s Time] [2022-11-16 20:15:01,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 619 states. [2022-11-16 20:15:01,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 619 to 238. [2022-11-16 20:15:01,323 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 238 states, 237 states have (on average 2.5147679324894514) internal successors, (596), 237 states have internal predecessors, (596), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:15:01,324 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 238 states to 238 states and 596 transitions. [2022-11-16 20:15:01,324 INFO L78 Accepts]: Start accepts. Automaton has 238 states and 596 transitions. Word has length 21 [2022-11-16 20:15:01,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:15:01,325 INFO L495 AbstractCegarLoop]: Abstraction has 238 states and 596 transitions. [2022-11-16 20:15:01,325 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 32 states have (on average 1.53125) internal successors, (49), 32 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:15:01,325 INFO L276 IsEmpty]: Start isEmpty. Operand 238 states and 596 transitions. [2022-11-16 20:15:01,326 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-11-16 20:15:01,326 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:15:01,326 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:15:01,334 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-11-16 20:15:01,532 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2022-11-16 20:15:01,532 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:15:01,532 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:15:01,533 INFO L85 PathProgramCache]: Analyzing trace with hash -258473448, now seen corresponding path program 22 times [2022-11-16 20:15:01,533 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:15:01,533 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [878136290] [2022-11-16 20:15:01,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:15:01,533 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:15:01,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:15:01,691 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 7 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-16 20:15:01,692 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:15:01,692 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [878136290] [2022-11-16 20:15:01,692 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [878136290] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:15:01,692 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1407978470] [2022-11-16 20:15:01,692 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-16 20:15:01,693 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:15:01,693 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:15:01,694 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:15:01,718 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-11-16 20:15:01,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:15:01,826 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-16 20:15:01,827 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:15:02,063 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 12 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-16 20:15:02,064 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:15:02,395 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 9 proven. 12 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-16 20:15:02,395 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1407978470] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:15:02,395 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [176929899] [2022-11-16 20:15:02,396 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:15:02,396 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:15:02,396 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 10, 10] total 24 [2022-11-16 20:15:02,396 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2028571633] [2022-11-16 20:15:02,397 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:15:02,397 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-11-16 20:15:02,397 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:15:02,397 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-11-16 20:15:02,398 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=434, Unknown=0, NotChecked=0, Total=600 [2022-11-16 20:15:02,398 INFO L87 Difference]: Start difference. First operand 238 states and 596 transitions. Second operand has 25 states, 25 states have (on average 2.24) internal successors, (56), 24 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:15:02,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:15:02,818 INFO L93 Difference]: Finished difference Result 514 states and 1195 transitions. [2022-11-16 20:15:02,818 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-11-16 20:15:02,818 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.24) internal successors, (56), 24 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2022-11-16 20:15:02,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:15:02,820 INFO L225 Difference]: With dead ends: 514 [2022-11-16 20:15:02,821 INFO L226 Difference]: Without dead ends: 400 [2022-11-16 20:15:02,821 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 342 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=347, Invalid=843, Unknown=0, NotChecked=0, Total=1190 [2022-11-16 20:15:02,822 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 154 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 311 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 154 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 333 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 311 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-16 20:15:02,822 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [154 Valid, 0 Invalid, 333 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 311 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-16 20:15:02,823 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 400 states. [2022-11-16 20:15:02,829 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 400 to 300. [2022-11-16 20:15:02,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 300 states, 299 states have (on average 2.7157190635451505) internal successors, (812), 299 states have internal predecessors, (812), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:15:02,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 300 states to 300 states and 812 transitions. [2022-11-16 20:15:02,831 INFO L78 Accepts]: Start accepts. Automaton has 300 states and 812 transitions. Word has length 22 [2022-11-16 20:15:02,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:15:02,831 INFO L495 AbstractCegarLoop]: Abstraction has 300 states and 812 transitions. [2022-11-16 20:15:02,832 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 2.24) internal successors, (56), 24 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:15:02,832 INFO L276 IsEmpty]: Start isEmpty. Operand 300 states and 812 transitions. [2022-11-16 20:15:02,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-11-16 20:15:02,841 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:15:02,841 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:15:02,848 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-11-16 20:15:03,047 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2022-11-16 20:15:03,047 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:15:03,048 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:15:03,048 INFO L85 PathProgramCache]: Analyzing trace with hash -1712447091, now seen corresponding path program 23 times [2022-11-16 20:15:03,048 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:15:03,048 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2072800790] [2022-11-16 20:15:03,048 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:15:03,048 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:15:03,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:15:03,966 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:15:03,966 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:15:03,966 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2072800790] [2022-11-16 20:15:03,966 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2072800790] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:15:03,966 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [307909663] [2022-11-16 20:15:03,966 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 20:15:03,967 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:15:03,967 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:15:03,968 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:15:03,970 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-11-16 20:15:04,162 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-16 20:15:04,162 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:15:04,164 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 28 conjunts are in the unsatisfiable core [2022-11-16 20:15:04,165 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:15:04,307 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 7 [2022-11-16 20:15:04,317 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-16 20:15:04,317 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:15:04,347 INFO L321 Elim1Store]: treesize reduction 5, result has 64.3 percent of original size [2022-11-16 20:15:04,348 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 17 [2022-11-16 20:15:04,400 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-16 20:15:04,400 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [307909663] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:15:04,401 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [454935715] [2022-11-16 20:15:04,401 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:15:04,401 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:15:04,401 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 7, 6] total 16 [2022-11-16 20:15:04,402 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [817750036] [2022-11-16 20:15:04,402 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:15:04,402 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-16 20:15:04,402 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:15:04,403 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-16 20:15:04,403 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=264, Unknown=0, NotChecked=0, Total=306 [2022-11-16 20:15:04,403 INFO L87 Difference]: Start difference. First operand 300 states and 812 transitions. Second operand has 18 states, 17 states have (on average 2.0) internal successors, (34), 17 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:15:05,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:15:05,682 INFO L93 Difference]: Finished difference Result 709 states and 1693 transitions. [2022-11-16 20:15:05,682 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-11-16 20:15:05,682 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 2.0) internal successors, (34), 17 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2022-11-16 20:15:05,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:15:05,684 INFO L225 Difference]: With dead ends: 709 [2022-11-16 20:15:05,684 INFO L226 Difference]: Without dead ends: 563 [2022-11-16 20:15:05,685 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 37 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 324 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=229, Invalid=1493, Unknown=0, NotChecked=0, Total=1722 [2022-11-16 20:15:05,685 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 213 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 530 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 213 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 552 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 530 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-16 20:15:05,685 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [213 Valid, 0 Invalid, 552 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 530 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-16 20:15:05,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 563 states. [2022-11-16 20:15:05,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 563 to 220. [2022-11-16 20:15:05,695 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 220 states, 219 states have (on average 2.4840182648401825) internal successors, (544), 219 states have internal predecessors, (544), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:15:05,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 220 states to 220 states and 544 transitions. [2022-11-16 20:15:05,696 INFO L78 Accepts]: Start accepts. Automaton has 220 states and 544 transitions. Word has length 22 [2022-11-16 20:15:05,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:15:05,697 INFO L495 AbstractCegarLoop]: Abstraction has 220 states and 544 transitions. [2022-11-16 20:15:05,697 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 2.0) internal successors, (34), 17 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:15:05,697 INFO L276 IsEmpty]: Start isEmpty. Operand 220 states and 544 transitions. [2022-11-16 20:15:05,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-11-16 20:15:05,698 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:15:05,698 INFO L195 NwaCegarLoop]: trace histogram [6, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:15:05,703 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-11-16 20:15:05,898 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:15:05,899 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:15:05,899 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:15:05,899 INFO L85 PathProgramCache]: Analyzing trace with hash -1975672512, now seen corresponding path program 24 times [2022-11-16 20:15:05,899 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:15:05,899 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1984075983] [2022-11-16 20:15:05,899 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:15:05,900 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:15:05,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:15:07,298 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:15:07,298 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:15:07,298 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1984075983] [2022-11-16 20:15:07,299 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1984075983] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:15:07,299 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [956340153] [2022-11-16 20:15:07,299 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 20:15:07,299 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:15:07,299 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:15:07,300 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:15:07,307 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-11-16 20:15:07,442 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 20:15:07,442 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:15:07,444 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 37 conjunts are in the unsatisfiable core [2022-11-16 20:15:07,446 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:15:07,845 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 20:15:07,848 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 21 [2022-11-16 20:15:07,947 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 7 [2022-11-16 20:15:07,954 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-16 20:15:07,954 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:15:07,988 WARN L833 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_900 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~#t2~0#1.base| v_ArrVal_900) c_~queue~0.base) (+ c_~queue~0.offset (* c_~front~0 4) 4)) 5)) is different from false [2022-11-16 20:15:08,005 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-16 20:15:08,005 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 44 treesize of output 41 [2022-11-16 20:15:08,017 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 3 [2022-11-16 20:15:08,165 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-16 20:15:08,165 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [956340153] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:15:08,166 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1307914679] [2022-11-16 20:15:08,167 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:15:08,168 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:15:08,168 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 7] total 28 [2022-11-16 20:15:08,168 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [89299630] [2022-11-16 20:15:08,168 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:15:08,169 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-11-16 20:15:08,169 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:15:08,169 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-11-16 20:15:08,169 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=719, Unknown=1, NotChecked=54, Total=870 [2022-11-16 20:15:08,179 INFO L87 Difference]: Start difference. First operand 220 states and 544 transitions. Second operand has 30 states, 29 states have (on average 1.6551724137931034) internal successors, (48), 29 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:15:09,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:15:09,181 INFO L93 Difference]: Finished difference Result 297 states and 701 transitions. [2022-11-16 20:15:09,182 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-16 20:15:09,182 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 29 states have (on average 1.6551724137931034) internal successors, (48), 29 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2022-11-16 20:15:09,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:15:09,184 INFO L225 Difference]: With dead ends: 297 [2022-11-16 20:15:09,185 INFO L226 Difference]: Without dead ends: 278 [2022-11-16 20:15:09,185 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 1 IntricatePredicates, 1 DeprecatedPredicates, 206 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=230, Invalid=1333, Unknown=1, NotChecked=76, Total=1640 [2022-11-16 20:15:09,185 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 110 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 468 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 110 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 548 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 468 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 63 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-16 20:15:09,186 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [110 Valid, 0 Invalid, 548 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 468 Invalid, 0 Unknown, 63 Unchecked, 0.4s Time] [2022-11-16 20:15:09,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 278 states. [2022-11-16 20:15:09,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 278 to 204. [2022-11-16 20:15:09,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 204 states, 203 states have (on average 2.4285714285714284) internal successors, (493), 203 states have internal predecessors, (493), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:15:09,192 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 493 transitions. [2022-11-16 20:15:09,192 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 493 transitions. Word has length 22 [2022-11-16 20:15:09,192 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:15:09,192 INFO L495 AbstractCegarLoop]: Abstraction has 204 states and 493 transitions. [2022-11-16 20:15:09,192 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 29 states have (on average 1.6551724137931034) internal successors, (48), 29 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:15:09,192 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 493 transitions. [2022-11-16 20:15:09,193 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-11-16 20:15:09,193 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:15:09,193 INFO L195 NwaCegarLoop]: trace histogram [6, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:15:09,206 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-11-16 20:15:09,406 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2022-11-16 20:15:09,406 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:15:09,407 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:15:09,407 INFO L85 PathProgramCache]: Analyzing trace with hash 1389973559, now seen corresponding path program 25 times [2022-11-16 20:15:09,407 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:15:09,407 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [959990476] [2022-11-16 20:15:09,407 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:15:09,407 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:15:09,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:15:10,965 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:15:10,965 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:15:10,965 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [959990476] [2022-11-16 20:15:10,965 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [959990476] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:15:10,965 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1433828825] [2022-11-16 20:15:10,965 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-16 20:15:10,966 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:15:10,966 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:15:10,968 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:15:10,986 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-11-16 20:15:11,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:15:11,111 INFO L263 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 35 conjunts are in the unsatisfiable core [2022-11-16 20:15:11,113 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:15:11,416 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 20:15:11,417 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 21 [2022-11-16 20:15:11,432 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 7 [2022-11-16 20:15:11,442 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-16 20:15:11,442 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:15:11,470 WARN L833 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_951 (Array Int Int))) (= 5 (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~#t2~0#1.base| v_ArrVal_951) c_~queue~0.base) (+ c_~queue~0.offset (* c_~front~0 4) 4)))) is different from false [2022-11-16 20:15:11,488 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-16 20:15:11,489 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 44 treesize of output 41 [2022-11-16 20:15:11,505 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 3 [2022-11-16 20:15:11,659 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-16 20:15:11,659 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1433828825] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:15:11,659 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1888391852] [2022-11-16 20:15:11,659 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:15:11,661 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:15:11,661 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11, 7] total 26 [2022-11-16 20:15:11,661 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1538575824] [2022-11-16 20:15:11,661 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:15:11,661 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-11-16 20:15:11,662 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:15:11,662 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-11-16 20:15:11,662 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=618, Unknown=1, NotChecked=50, Total=756 [2022-11-16 20:15:11,663 INFO L87 Difference]: Start difference. First operand 204 states and 493 transitions. Second operand has 28 states, 27 states have (on average 1.5925925925925926) internal successors, (43), 27 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:15:13,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:15:13,163 INFO L93 Difference]: Finished difference Result 344 states and 819 transitions. [2022-11-16 20:15:13,164 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-11-16 20:15:13,164 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 1.5925925925925926) internal successors, (43), 27 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2022-11-16 20:15:13,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:15:13,166 INFO L225 Difference]: With dead ends: 344 [2022-11-16 20:15:13,166 INFO L226 Difference]: Without dead ends: 327 [2022-11-16 20:15:13,166 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 273 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=281, Invalid=1528, Unknown=1, NotChecked=82, Total=1892 [2022-11-16 20:15:13,167 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 116 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 451 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 116 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 512 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 451 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 45 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-16 20:15:13,167 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [116 Valid, 0 Invalid, 512 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 451 Invalid, 0 Unknown, 45 Unchecked, 0.4s Time] [2022-11-16 20:15:13,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 327 states. [2022-11-16 20:15:13,173 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 327 to 220. [2022-11-16 20:15:13,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 220 states, 219 states have (on average 2.4337899543378994) internal successors, (533), 219 states have internal predecessors, (533), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:15:13,175 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 220 states to 220 states and 533 transitions. [2022-11-16 20:15:13,175 INFO L78 Accepts]: Start accepts. Automaton has 220 states and 533 transitions. Word has length 23 [2022-11-16 20:15:13,175 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:15:13,175 INFO L495 AbstractCegarLoop]: Abstraction has 220 states and 533 transitions. [2022-11-16 20:15:13,176 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 27 states have (on average 1.5925925925925926) internal successors, (43), 27 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:15:13,176 INFO L276 IsEmpty]: Start isEmpty. Operand 220 states and 533 transitions. [2022-11-16 20:15:13,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-11-16 20:15:13,177 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:15:13,177 INFO L195 NwaCegarLoop]: trace histogram [6, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:15:13,182 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2022-11-16 20:15:13,382 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2022-11-16 20:15:13,382 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:15:13,383 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:15:13,383 INFO L85 PathProgramCache]: Analyzing trace with hash 73816255, now seen corresponding path program 26 times [2022-11-16 20:15:13,383 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:15:13,383 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1635222727] [2022-11-16 20:15:13,383 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:15:13,383 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:15:13,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:15:14,659 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:15:14,659 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:15:14,659 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1635222727] [2022-11-16 20:15:14,659 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1635222727] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:15:14,660 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [697307491] [2022-11-16 20:15:14,660 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 20:15:14,660 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:15:14,660 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:15:14,661 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:15:14,663 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-11-16 20:15:14,855 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-16 20:15:14,855 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:15:14,857 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-16 20:15:14,859 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:15:15,035 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 20:15:15,036 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 21 [2022-11-16 20:15:15,111 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 7 [2022-11-16 20:15:15,124 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-16 20:15:15,124 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:15:15,155 WARN L833 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_1002 (Array Int Int))) (= 5 (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~#t2~0#1.base| v_ArrVal_1002) c_~queue~0.base) (+ c_~queue~0.offset (* c_~front~0 4) 4)))) is different from false [2022-11-16 20:15:15,169 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-16 20:15:15,169 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 44 treesize of output 41 [2022-11-16 20:15:15,184 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 3 [2022-11-16 20:15:15,327 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-16 20:15:15,327 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [697307491] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:15:15,328 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [187734361] [2022-11-16 20:15:15,328 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:15:15,329 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:15:15,329 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 7, 7] total 24 [2022-11-16 20:15:15,329 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [190001640] [2022-11-16 20:15:15,330 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:15:15,330 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-16 20:15:15,330 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:15:15,331 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-16 20:15:15,331 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=525, Unknown=1, NotChecked=46, Total=650 [2022-11-16 20:15:15,331 INFO L87 Difference]: Start difference. First operand 220 states and 533 transitions. Second operand has 26 states, 25 states have (on average 1.68) internal successors, (42), 25 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:15:16,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:15:16,125 INFO L93 Difference]: Finished difference Result 383 states and 922 transitions. [2022-11-16 20:15:16,126 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-16 20:15:16,126 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 1.68) internal successors, (42), 25 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2022-11-16 20:15:16,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:15:16,129 INFO L225 Difference]: With dead ends: 383 [2022-11-16 20:15:16,129 INFO L226 Difference]: Without dead ends: 359 [2022-11-16 20:15:16,130 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 33 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 179 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=189, Invalid=936, Unknown=1, NotChecked=64, Total=1190 [2022-11-16 20:15:16,130 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 103 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 318 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 103 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 366 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 318 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 34 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-16 20:15:16,131 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [103 Valid, 0 Invalid, 366 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 318 Invalid, 0 Unknown, 34 Unchecked, 0.3s Time] [2022-11-16 20:15:16,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 359 states. [2022-11-16 20:15:16,136 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 359 to 147. [2022-11-16 20:15:16,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 147 states, 146 states have (on average 2.315068493150685) internal successors, (338), 146 states have internal predecessors, (338), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:15:16,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 338 transitions. [2022-11-16 20:15:16,137 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 338 transitions. Word has length 23 [2022-11-16 20:15:16,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:15:16,138 INFO L495 AbstractCegarLoop]: Abstraction has 147 states and 338 transitions. [2022-11-16 20:15:16,138 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 1.68) internal successors, (42), 25 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:15:16,138 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 338 transitions. [2022-11-16 20:15:16,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-11-16 20:15:16,139 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:15:16,139 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:15:16,155 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2022-11-16 20:15:16,345 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2022-11-16 20:15:16,345 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:15:16,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:15:16,346 INFO L85 PathProgramCache]: Analyzing trace with hash -1426863592, now seen corresponding path program 27 times [2022-11-16 20:15:16,346 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:15:16,346 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [429593067] [2022-11-16 20:15:16,346 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:15:16,346 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:15:16,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:15:17,069 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 3 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:15:17,069 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:15:17,069 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [429593067] [2022-11-16 20:15:17,069 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [429593067] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:15:17,069 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2074398327] [2022-11-16 20:15:17,070 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 20:15:17,070 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:15:17,070 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:15:17,071 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:15:17,090 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-11-16 20:15:17,227 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 20:15:17,227 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:15:17,229 INFO L263 TraceCheckSpWp]: Trace formula consists of 258 conjuncts, 40 conjunts are in the unsatisfiable core [2022-11-16 20:15:17,231 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:15:17,772 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 7 [2022-11-16 20:15:17,784 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:15:17,784 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:15:17,830 INFO L321 Elim1Store]: treesize reduction 5, result has 64.3 percent of original size [2022-11-16 20:15:17,830 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 17 [2022-11-16 20:15:18,345 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:15:18,345 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2074398327] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:15:18,345 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [409307826] [2022-11-16 20:15:18,346 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:15:18,346 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:15:18,346 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 36 [2022-11-16 20:15:18,346 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [705921938] [2022-11-16 20:15:18,347 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:15:18,347 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-11-16 20:15:18,347 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:15:18,347 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-11-16 20:15:18,348 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=1173, Unknown=0, NotChecked=0, Total=1406 [2022-11-16 20:15:18,348 INFO L87 Difference]: Start difference. First operand 147 states and 338 transitions. Second operand has 38 states, 37 states have (on average 1.4864864864864864) internal successors, (55), 37 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:15:31,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:15:31,341 INFO L93 Difference]: Finished difference Result 2566 states and 5829 transitions. [2022-11-16 20:15:31,341 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 179 states. [2022-11-16 20:15:31,341 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 37 states have (on average 1.4864864864864864) internal successors, (55), 37 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2022-11-16 20:15:31,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:15:31,349 INFO L225 Difference]: With dead ends: 2566 [2022-11-16 20:15:31,350 INFO L226 Difference]: Without dead ends: 2286 [2022-11-16 20:15:31,353 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 224 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 200 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14062 ImplicationChecksByTransitivity, 8.5s TimeCoverageRelationStatistics Valid=5523, Invalid=35079, Unknown=0, NotChecked=0, Total=40602 [2022-11-16 20:15:31,354 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 713 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 6164 mSolverCounterSat, 87 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 713 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 6251 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 87 IncrementalHoareTripleChecker+Valid, 6164 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.0s IncrementalHoareTripleChecker+Time [2022-11-16 20:15:31,354 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [713 Valid, 0 Invalid, 6251 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [87 Valid, 6164 Invalid, 0 Unknown, 0 Unchecked, 5.0s Time] [2022-11-16 20:15:31,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2286 states. [2022-11-16 20:15:31,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2286 to 471. [2022-11-16 20:15:31,382 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 471 states, 470 states have (on average 2.9638297872340424) internal successors, (1393), 470 states have internal predecessors, (1393), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:15:31,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 471 states to 471 states and 1393 transitions. [2022-11-16 20:15:31,384 INFO L78 Accepts]: Start accepts. Automaton has 471 states and 1393 transitions. Word has length 24 [2022-11-16 20:15:31,384 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:15:31,384 INFO L495 AbstractCegarLoop]: Abstraction has 471 states and 1393 transitions. [2022-11-16 20:15:31,385 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 37 states have (on average 1.4864864864864864) internal successors, (55), 37 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:15:31,385 INFO L276 IsEmpty]: Start isEmpty. Operand 471 states and 1393 transitions. [2022-11-16 20:15:31,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-11-16 20:15:31,386 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:15:31,387 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:15:31,393 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2022-11-16 20:15:31,592 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:15:31,593 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:15:31,593 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:15:31,593 INFO L85 PathProgramCache]: Analyzing trace with hash 172343520, now seen corresponding path program 28 times [2022-11-16 20:15:31,593 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:15:31,593 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1957521668] [2022-11-16 20:15:31,593 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:15:31,593 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:15:31,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:15:32,282 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 3 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:15:32,282 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:15:32,283 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1957521668] [2022-11-16 20:15:32,283 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1957521668] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:15:32,283 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1322876331] [2022-11-16 20:15:32,283 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-16 20:15:32,283 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:15:32,283 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:15:32,284 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:15:32,320 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-11-16 20:15:32,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:15:32,455 INFO L263 TraceCheckSpWp]: Trace formula consists of 258 conjuncts, 40 conjunts are in the unsatisfiable core [2022-11-16 20:15:32,457 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:15:33,002 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 7 [2022-11-16 20:15:33,022 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:15:33,022 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:15:33,060 INFO L321 Elim1Store]: treesize reduction 5, result has 64.3 percent of original size [2022-11-16 20:15:33,060 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 17 [2022-11-16 20:15:33,640 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:15:33,641 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1322876331] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:15:33,641 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1738581319] [2022-11-16 20:15:33,641 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:15:33,641 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:15:33,642 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 37 [2022-11-16 20:15:33,642 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1964973627] [2022-11-16 20:15:33,642 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:15:33,643 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-11-16 20:15:33,643 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:15:33,643 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-11-16 20:15:33,644 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=258, Invalid=1224, Unknown=0, NotChecked=0, Total=1482 [2022-11-16 20:15:33,644 INFO L87 Difference]: Start difference. First operand 471 states and 1393 transitions. Second operand has 39 states, 38 states have (on average 1.5) internal successors, (57), 38 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:15:38,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:15:38,939 INFO L93 Difference]: Finished difference Result 1459 states and 3211 transitions. [2022-11-16 20:15:38,940 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2022-11-16 20:15:38,940 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 38 states have (on average 1.5) internal successors, (57), 38 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2022-11-16 20:15:38,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:15:38,944 INFO L225 Difference]: With dead ends: 1459 [2022-11-16 20:15:38,944 INFO L226 Difference]: Without dead ends: 1216 [2022-11-16 20:15:38,946 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4170 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=1984, Invalid=12058, Unknown=0, NotChecked=0, Total=14042 [2022-11-16 20:15:38,946 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 611 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 2185 mSolverCounterSat, 118 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 611 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 2303 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 118 IncrementalHoareTripleChecker+Valid, 2185 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2022-11-16 20:15:38,947 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [611 Valid, 0 Invalid, 2303 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [118 Valid, 2185 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2022-11-16 20:15:38,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1216 states. [2022-11-16 20:15:38,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1216 to 405. [2022-11-16 20:15:38,965 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 405 states, 404 states have (on average 2.717821782178218) internal successors, (1098), 404 states have internal predecessors, (1098), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:15:38,966 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 405 states to 405 states and 1098 transitions. [2022-11-16 20:15:38,966 INFO L78 Accepts]: Start accepts. Automaton has 405 states and 1098 transitions. Word has length 24 [2022-11-16 20:15:38,967 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:15:38,967 INFO L495 AbstractCegarLoop]: Abstraction has 405 states and 1098 transitions. [2022-11-16 20:15:38,967 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 38 states have (on average 1.5) internal successors, (57), 38 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:15:38,967 INFO L276 IsEmpty]: Start isEmpty. Operand 405 states and 1098 transitions. [2022-11-16 20:15:38,968 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-11-16 20:15:38,968 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:15:38,969 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:15:38,975 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2022-11-16 20:15:39,175 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:15:39,175 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:15:39,176 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:15:39,176 INFO L85 PathProgramCache]: Analyzing trace with hash -368137834, now seen corresponding path program 29 times [2022-11-16 20:15:39,176 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:15:39,176 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [44716960] [2022-11-16 20:15:39,176 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:15:39,176 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:15:39,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:15:40,117 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 3 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:15:40,117 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:15:40,118 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [44716960] [2022-11-16 20:15:40,118 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [44716960] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:15:40,118 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1018508108] [2022-11-16 20:15:40,118 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 20:15:40,118 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:15:40,118 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:15:40,120 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:15:40,122 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-11-16 20:15:40,495 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-16 20:15:40,496 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:15:40,498 INFO L263 TraceCheckSpWp]: Trace formula consists of 248 conjuncts, 49 conjunts are in the unsatisfiable core [2022-11-16 20:15:40,499 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:15:41,214 INFO L321 Elim1Store]: treesize reduction 34, result has 8.1 percent of original size [2022-11-16 20:15:41,215 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 34 treesize of output 13 [2022-11-16 20:15:41,229 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 7 proven. 22 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-16 20:15:41,230 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:15:41,673 INFO L321 Elim1Store]: treesize reduction 22, result has 40.5 percent of original size [2022-11-16 20:15:41,675 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 36 treesize of output 26 [2022-11-16 20:15:42,117 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 1 proven. 28 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-16 20:15:42,117 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1018508108] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:15:42,117 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2050172878] [2022-11-16 20:15:42,118 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:15:42,119 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:15:42,119 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 13] total 37 [2022-11-16 20:15:42,120 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1634701294] [2022-11-16 20:15:42,120 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:15:42,120 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-11-16 20:15:42,120 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:15:42,121 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-11-16 20:15:42,121 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=219, Invalid=1263, Unknown=0, NotChecked=0, Total=1482 [2022-11-16 20:15:42,121 INFO L87 Difference]: Start difference. First operand 405 states and 1098 transitions. Second operand has 39 states, 38 states have (on average 1.5) internal successors, (57), 38 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:15:45,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:15:45,276 INFO L93 Difference]: Finished difference Result 1289 states and 3745 transitions. [2022-11-16 20:15:45,276 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-11-16 20:15:45,277 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 38 states have (on average 1.5) internal successors, (57), 38 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2022-11-16 20:15:45,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:15:45,283 INFO L225 Difference]: With dead ends: 1289 [2022-11-16 20:15:45,284 INFO L226 Difference]: Without dead ends: 1269 [2022-11-16 20:15:45,284 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 26 SyntacticMatches, 4 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1212 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=1206, Invalid=4800, Unknown=0, NotChecked=0, Total=6006 [2022-11-16 20:15:45,285 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 124 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 498 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 124 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 986 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 498 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 469 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-16 20:15:45,285 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [124 Valid, 0 Invalid, 986 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 498 Invalid, 0 Unknown, 469 Unchecked, 0.5s Time] [2022-11-16 20:15:45,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1269 states. [2022-11-16 20:15:45,324 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1269 to 762. [2022-11-16 20:15:45,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 762 states, 761 states have (on average 3.011826544021025) internal successors, (2292), 761 states have internal predecessors, (2292), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:15:45,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 762 states to 762 states and 2292 transitions. [2022-11-16 20:15:45,329 INFO L78 Accepts]: Start accepts. Automaton has 762 states and 2292 transitions. Word has length 24 [2022-11-16 20:15:45,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:15:45,330 INFO L495 AbstractCegarLoop]: Abstraction has 762 states and 2292 transitions. [2022-11-16 20:15:45,330 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 38 states have (on average 1.5) internal successors, (57), 38 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:15:45,330 INFO L276 IsEmpty]: Start isEmpty. Operand 762 states and 2292 transitions. [2022-11-16 20:15:45,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-11-16 20:15:45,332 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:15:45,332 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:15:45,344 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2022-11-16 20:15:45,539 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:15:45,539 INFO L420 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:15:45,540 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:15:45,541 INFO L85 PathProgramCache]: Analyzing trace with hash 1163722430, now seen corresponding path program 30 times [2022-11-16 20:15:45,541 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:15:45,541 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2091199043] [2022-11-16 20:15:45,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:15:45,541 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:15:45,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:15:46,517 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 3 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:15:46,517 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:15:46,517 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2091199043] [2022-11-16 20:15:46,517 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2091199043] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:15:46,518 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1804062597] [2022-11-16 20:15:46,518 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 20:15:46,518 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:15:46,518 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:15:46,519 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:15:46,522 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-11-16 20:15:46,673 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 20:15:46,673 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:15:46,675 INFO L263 TraceCheckSpWp]: Trace formula consists of 258 conjuncts, 40 conjunts are in the unsatisfiable core [2022-11-16 20:15:46,677 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:15:47,295 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 7 [2022-11-16 20:15:47,300 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:15:47,301 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:15:47,407 INFO L321 Elim1Store]: treesize reduction 5, result has 64.3 percent of original size [2022-11-16 20:15:47,407 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 17 [2022-11-16 20:15:48,109 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:15:48,110 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1804062597] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:15:48,110 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1209941528] [2022-11-16 20:15:48,110 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:15:48,111 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:15:48,111 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 40 [2022-11-16 20:15:48,112 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1152878226] [2022-11-16 20:15:48,112 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:15:48,112 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2022-11-16 20:15:48,112 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:15:48,113 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2022-11-16 20:15:48,113 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=252, Invalid=1470, Unknown=0, NotChecked=0, Total=1722 [2022-11-16 20:15:48,113 INFO L87 Difference]: Start difference. First operand 762 states and 2292 transitions. Second operand has 42 states, 41 states have (on average 1.6097560975609757) internal successors, (66), 41 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:15:53,620 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:15:53,620 INFO L93 Difference]: Finished difference Result 1650 states and 4372 transitions. [2022-11-16 20:15:53,621 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2022-11-16 20:15:53,621 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 41 states have (on average 1.6097560975609757) internal successors, (66), 41 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2022-11-16 20:15:53,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:15:53,626 INFO L225 Difference]: With dead ends: 1650 [2022-11-16 20:15:53,626 INFO L226 Difference]: Without dead ends: 1431 [2022-11-16 20:15:53,627 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2640 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=1461, Invalid=10311, Unknown=0, NotChecked=0, Total=11772 [2022-11-16 20:15:53,627 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 649 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 2073 mSolverCounterSat, 206 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 649 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 2279 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 206 IncrementalHoareTripleChecker+Valid, 2073 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2022-11-16 20:15:53,627 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [649 Valid, 0 Invalid, 2279 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [206 Valid, 2073 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2022-11-16 20:15:53,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1431 states. [2022-11-16 20:15:53,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1431 to 714. [2022-11-16 20:15:53,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 714 states, 713 states have (on average 3.1037868162692845) internal successors, (2213), 713 states have internal predecessors, (2213), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:15:53,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 714 states to 714 states and 2213 transitions. [2022-11-16 20:15:53,656 INFO L78 Accepts]: Start accepts. Automaton has 714 states and 2213 transitions. Word has length 24 [2022-11-16 20:15:53,656 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:15:53,657 INFO L495 AbstractCegarLoop]: Abstraction has 714 states and 2213 transitions. [2022-11-16 20:15:53,657 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 41 states have (on average 1.6097560975609757) internal successors, (66), 41 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:15:53,657 INFO L276 IsEmpty]: Start isEmpty. Operand 714 states and 2213 transitions. [2022-11-16 20:15:53,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-11-16 20:15:53,659 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:15:53,659 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:15:53,667 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2022-11-16 20:15:53,865 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2022-11-16 20:15:53,865 INFO L420 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:15:53,865 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:15:53,865 INFO L85 PathProgramCache]: Analyzing trace with hash -989036392, now seen corresponding path program 31 times [2022-11-16 20:15:53,865 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:15:53,866 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [205413941] [2022-11-16 20:15:53,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:15:53,866 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:15:53,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:15:54,735 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 1 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:15:54,735 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:15:54,735 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [205413941] [2022-11-16 20:15:54,735 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [205413941] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:15:54,735 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1508815098] [2022-11-16 20:15:54,735 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-16 20:15:54,735 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:15:54,736 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:15:54,737 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:15:54,739 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2022-11-16 20:15:54,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:15:54,886 INFO L263 TraceCheckSpWp]: Trace formula consists of 258 conjuncts, 47 conjunts are in the unsatisfiable core [2022-11-16 20:15:54,888 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:15:55,363 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 20:15:55,365 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 21 [2022-11-16 20:15:55,553 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 7 [2022-11-16 20:15:55,563 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:15:55,563 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:15:55,627 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-16 20:15:55,628 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 27 [2022-11-16 20:15:56,215 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:15:56,216 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1508815098] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:15:56,216 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [206124569] [2022-11-16 20:15:56,216 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:15:56,217 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:15:56,218 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 38 [2022-11-16 20:15:56,218 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [353839108] [2022-11-16 20:15:56,218 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:15:56,218 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-11-16 20:15:56,218 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:15:56,219 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-11-16 20:15:56,219 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=204, Invalid=1356, Unknown=0, NotChecked=0, Total=1560 [2022-11-16 20:15:56,219 INFO L87 Difference]: Start difference. First operand 714 states and 2213 transitions. Second operand has 40 states, 39 states have (on average 1.358974358974359) internal successors, (53), 39 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:16:00,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:16:00,300 INFO L93 Difference]: Finished difference Result 1434 states and 3935 transitions. [2022-11-16 20:16:00,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2022-11-16 20:16:00,301 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 39 states have (on average 1.358974358974359) internal successors, (53), 39 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2022-11-16 20:16:00,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:16:00,307 INFO L225 Difference]: With dead ends: 1434 [2022-11-16 20:16:00,307 INFO L226 Difference]: Without dead ends: 1420 [2022-11-16 20:16:00,308 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1450 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=990, Invalid=5172, Unknown=0, NotChecked=0, Total=6162 [2022-11-16 20:16:00,309 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 544 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 1548 mSolverCounterSat, 124 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 544 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 1672 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 124 IncrementalHoareTripleChecker+Valid, 1548 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-11-16 20:16:00,309 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [544 Valid, 0 Invalid, 1672 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [124 Valid, 1548 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-11-16 20:16:00,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1420 states. [2022-11-16 20:16:00,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1420 to 720. [2022-11-16 20:16:00,334 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 720 states, 719 states have (on average 3.0945757997218357) internal successors, (2225), 719 states have internal predecessors, (2225), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:16:00,336 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 720 states to 720 states and 2225 transitions. [2022-11-16 20:16:00,337 INFO L78 Accepts]: Start accepts. Automaton has 720 states and 2225 transitions. Word has length 24 [2022-11-16 20:16:00,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:16:00,337 INFO L495 AbstractCegarLoop]: Abstraction has 720 states and 2225 transitions. [2022-11-16 20:16:00,337 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 39 states have (on average 1.358974358974359) internal successors, (53), 39 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:16:00,337 INFO L276 IsEmpty]: Start isEmpty. Operand 720 states and 2225 transitions. [2022-11-16 20:16:00,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-11-16 20:16:00,339 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:16:00,339 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:16:00,346 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2022-11-16 20:16:00,546 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2022-11-16 20:16:00,546 INFO L420 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:16:00,546 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:16:00,546 INFO L85 PathProgramCache]: Analyzing trace with hash 1479060842, now seen corresponding path program 32 times [2022-11-16 20:16:00,546 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:16:00,546 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [882502208] [2022-11-16 20:16:00,546 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:16:00,547 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:16:00,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:16:00,687 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 19 proven. 6 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-16 20:16:00,687 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:16:00,687 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [882502208] [2022-11-16 20:16:00,687 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [882502208] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:16:00,687 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1511179344] [2022-11-16 20:16:00,687 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 20:16:00,687 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:16:00,688 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:16:00,688 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:16:00,691 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2022-11-16 20:16:00,868 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-16 20:16:00,868 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:16:00,870 INFO L263 TraceCheckSpWp]: Trace formula consists of 248 conjuncts, 56 conjunts are in the unsatisfiable core [2022-11-16 20:16:00,871 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:16:01,332 INFO L321 Elim1Store]: treesize reduction 38, result has 7.3 percent of original size [2022-11-16 20:16:01,333 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 47 treesize of output 16 [2022-11-16 20:16:01,374 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 10 proven. 19 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-16 20:16:01,374 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:16:01,741 INFO L321 Elim1Store]: treesize reduction 15, result has 63.4 percent of original size [2022-11-16 20:16:01,741 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 50 treesize of output 41 [2022-11-16 20:16:01,971 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-16 20:16:01,972 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1511179344] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:16:01,972 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2073023269] [2022-11-16 20:16:01,972 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:16:01,972 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:16:01,973 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 12, 12] total 28 [2022-11-16 20:16:01,973 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [842840788] [2022-11-16 20:16:01,973 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:16:01,974 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-11-16 20:16:01,974 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:16:01,974 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-11-16 20:16:01,974 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=661, Unknown=0, NotChecked=0, Total=812 [2022-11-16 20:16:01,974 INFO L87 Difference]: Start difference. First operand 720 states and 2225 transitions. Second operand has 29 states, 29 states have (on average 2.0344827586206895) internal successors, (59), 28 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:16:03,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:16:03,856 INFO L93 Difference]: Finished difference Result 1693 states and 5571 transitions. [2022-11-16 20:16:03,856 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2022-11-16 20:16:03,856 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.0344827586206895) internal successors, (59), 28 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2022-11-16 20:16:03,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:16:03,864 INFO L225 Difference]: With dead ends: 1693 [2022-11-16 20:16:03,864 INFO L226 Difference]: Without dead ends: 1662 [2022-11-16 20:16:03,865 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1686 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1266, Invalid=4740, Unknown=0, NotChecked=0, Total=6006 [2022-11-16 20:16:03,865 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 249 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 184 mSolverCounterSat, 56 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 249 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 415 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 56 IncrementalHoareTripleChecker+Valid, 184 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 175 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-16 20:16:03,866 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [249 Valid, 0 Invalid, 415 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [56 Valid, 184 Invalid, 0 Unknown, 175 Unchecked, 0.2s Time] [2022-11-16 20:16:03,869 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1662 states. [2022-11-16 20:16:03,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1662 to 1246. [2022-11-16 20:16:03,917 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1246 states, 1245 states have (on average 3.3493975903614457) internal successors, (4170), 1245 states have internal predecessors, (4170), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:16:03,922 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1246 states to 1246 states and 4170 transitions. [2022-11-16 20:16:03,922 INFO L78 Accepts]: Start accepts. Automaton has 1246 states and 4170 transitions. Word has length 25 [2022-11-16 20:16:03,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:16:03,923 INFO L495 AbstractCegarLoop]: Abstraction has 1246 states and 4170 transitions. [2022-11-16 20:16:03,923 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 2.0344827586206895) internal successors, (59), 28 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:16:03,923 INFO L276 IsEmpty]: Start isEmpty. Operand 1246 states and 4170 transitions. [2022-11-16 20:16:03,926 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-11-16 20:16:03,926 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:16:03,926 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:16:03,932 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Ended with exit code 0 [2022-11-16 20:16:04,132 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2022-11-16 20:16:04,133 INFO L420 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:16:04,133 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:16:04,133 INFO L85 PathProgramCache]: Analyzing trace with hash -1284046190, now seen corresponding path program 33 times [2022-11-16 20:16:04,133 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:16:04,133 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1181927959] [2022-11-16 20:16:04,133 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:16:04,134 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:16:04,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:16:04,309 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 11 proven. 14 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-16 20:16:04,309 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:16:04,309 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1181927959] [2022-11-16 20:16:04,309 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1181927959] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:16:04,310 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1999645696] [2022-11-16 20:16:04,310 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 20:16:04,310 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:16:04,310 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:16:04,311 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:16:04,343 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2022-11-16 20:16:04,477 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 20:16:04,477 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:16:04,479 INFO L263 TraceCheckSpWp]: Trace formula consists of 268 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-16 20:16:04,480 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:16:04,734 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 18 proven. 14 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-16 20:16:04,734 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:16:05,113 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 14 proven. 18 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-16 20:16:05,113 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1999645696] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:16:05,113 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [969201240] [2022-11-16 20:16:05,114 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:16:05,114 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:16:05,115 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 12, 12] total 29 [2022-11-16 20:16:05,115 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1055723918] [2022-11-16 20:16:05,115 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:16:05,115 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-11-16 20:16:05,116 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:16:05,116 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-11-16 20:16:05,116 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=633, Unknown=0, NotChecked=0, Total=870 [2022-11-16 20:16:05,116 INFO L87 Difference]: Start difference. First operand 1246 states and 4170 transitions. Second operand has 30 states, 30 states have (on average 2.066666666666667) internal successors, (62), 29 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:16:05,698 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:16:05,698 INFO L93 Difference]: Finished difference Result 1151 states and 2921 transitions. [2022-11-16 20:16:05,698 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-11-16 20:16:05,699 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 2.066666666666667) internal successors, (62), 29 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2022-11-16 20:16:05,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:16:05,702 INFO L225 Difference]: With dead ends: 1151 [2022-11-16 20:16:05,702 INFO L226 Difference]: Without dead ends: 838 [2022-11-16 20:16:05,703 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 581 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=573, Invalid=1407, Unknown=0, NotChecked=0, Total=1980 [2022-11-16 20:16:05,703 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 226 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 354 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 226 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 398 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 354 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-16 20:16:05,704 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [226 Valid, 0 Invalid, 398 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 354 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-16 20:16:05,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 838 states. [2022-11-16 20:16:05,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 838 to 604. [2022-11-16 20:16:05,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 604 states, 603 states have (on average 3.0049751243781095) internal successors, (1812), 603 states have internal predecessors, (1812), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:16:05,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 604 states to 604 states and 1812 transitions. [2022-11-16 20:16:05,744 INFO L78 Accepts]: Start accepts. Automaton has 604 states and 1812 transitions. Word has length 25 [2022-11-16 20:16:05,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:16:05,744 INFO L495 AbstractCegarLoop]: Abstraction has 604 states and 1812 transitions. [2022-11-16 20:16:05,744 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 2.066666666666667) internal successors, (62), 29 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:16:05,745 INFO L276 IsEmpty]: Start isEmpty. Operand 604 states and 1812 transitions. [2022-11-16 20:16:05,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-11-16 20:16:05,746 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:16:05,747 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:16:05,753 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2022-11-16 20:16:05,953 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2022-11-16 20:16:05,953 INFO L420 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:16:05,953 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:16:05,954 INFO L85 PathProgramCache]: Analyzing trace with hash -597538961, now seen corresponding path program 34 times [2022-11-16 20:16:05,954 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:16:05,954 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [240083990] [2022-11-16 20:16:05,954 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:16:05,954 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:16:05,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:16:06,919 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:16:06,919 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:16:06,919 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [240083990] [2022-11-16 20:16:06,920 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [240083990] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:16:06,920 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [847436086] [2022-11-16 20:16:06,920 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-16 20:16:06,920 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:16:06,920 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:16:06,923 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:16:06,950 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2022-11-16 20:16:07,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:16:07,112 INFO L263 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 38 conjunts are in the unsatisfiable core [2022-11-16 20:16:07,113 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:16:07,381 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 7 [2022-11-16 20:16:07,386 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-16 20:16:07,386 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:16:07,411 INFO L321 Elim1Store]: treesize reduction 5, result has 58.3 percent of original size [2022-11-16 20:16:07,411 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 24 treesize of output 15 [2022-11-16 20:16:07,469 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 19 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-16 20:16:07,469 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [847436086] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:16:07,469 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [401757609] [2022-11-16 20:16:07,469 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:16:07,470 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:16:07,470 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 10, 6] total 24 [2022-11-16 20:16:07,470 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1095048836] [2022-11-16 20:16:07,470 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:16:07,470 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-16 20:16:07,470 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:16:07,471 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-16 20:16:07,471 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=573, Unknown=0, NotChecked=0, Total=650 [2022-11-16 20:16:07,471 INFO L87 Difference]: Start difference. First operand 604 states and 1812 transitions. Second operand has 26 states, 25 states have (on average 1.92) internal successors, (48), 25 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:16:09,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:16:09,883 INFO L93 Difference]: Finished difference Result 1405 states and 3573 transitions. [2022-11-16 20:16:09,884 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-11-16 20:16:09,884 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 1.92) internal successors, (48), 25 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2022-11-16 20:16:09,884 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:16:09,887 INFO L225 Difference]: With dead ends: 1405 [2022-11-16 20:16:09,888 INFO L226 Difference]: Without dead ends: 1346 [2022-11-16 20:16:09,888 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 38 SyntacticMatches, 1 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 708 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=353, Invalid=3069, Unknown=0, NotChecked=0, Total=3422 [2022-11-16 20:16:09,888 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 318 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 1772 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 318 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 1793 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 1772 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2022-11-16 20:16:09,889 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [318 Valid, 0 Invalid, 1793 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 1772 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2022-11-16 20:16:09,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1346 states. [2022-11-16 20:16:09,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1346 to 612. [2022-11-16 20:16:09,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 612 states, 611 states have (on average 2.9918166939443536) internal successors, (1828), 611 states have internal predecessors, (1828), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:16:09,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 612 states to 612 states and 1828 transitions. [2022-11-16 20:16:09,914 INFO L78 Accepts]: Start accepts. Automaton has 612 states and 1828 transitions. Word has length 25 [2022-11-16 20:16:09,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:16:09,914 INFO L495 AbstractCegarLoop]: Abstraction has 612 states and 1828 transitions. [2022-11-16 20:16:09,914 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 1.92) internal successors, (48), 25 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:16:09,915 INFO L276 IsEmpty]: Start isEmpty. Operand 612 states and 1828 transitions. [2022-11-16 20:16:09,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-11-16 20:16:09,917 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:16:09,917 INFO L195 NwaCegarLoop]: trace histogram [8, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:16:09,928 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Ended with exit code 0 [2022-11-16 20:16:10,123 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:16:10,123 INFO L420 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:16:10,123 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:16:10,124 INFO L85 PathProgramCache]: Analyzing trace with hash -1115565391, now seen corresponding path program 35 times [2022-11-16 20:16:10,124 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:16:10,124 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [854073050] [2022-11-16 20:16:10,124 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:16:10,124 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:16:10,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:16:12,549 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 48 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:16:12,549 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:16:12,549 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [854073050] [2022-11-16 20:16:12,550 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [854073050] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:16:12,550 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1407059844] [2022-11-16 20:16:12,550 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 20:16:12,550 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:16:12,550 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:16:12,555 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:16:12,561 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2022-11-16 20:16:12,795 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-16 20:16:12,795 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:16:12,797 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 28 conjunts are in the unsatisfiable core [2022-11-16 20:16:12,798 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:16:13,142 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 20:16:13,143 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 20 [2022-11-16 20:16:13,426 INFO L321 Elim1Store]: treesize reduction 9, result has 25.0 percent of original size [2022-11-16 20:16:13,426 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 10 [2022-11-16 20:16:13,445 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-16 20:16:13,445 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:16:13,872 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-16 20:16:13,872 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 38 [2022-11-16 20:16:13,879 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 7 [2022-11-16 20:16:14,375 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 1 proven. 11 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-16 20:16:14,376 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1407059844] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:16:14,376 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [392642647] [2022-11-16 20:16:14,376 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:16:14,378 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:16:14,378 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 9, 9] total 33 [2022-11-16 20:16:14,378 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1146848493] [2022-11-16 20:16:14,378 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:16:14,379 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-16 20:16:14,379 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:16:14,379 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-16 20:16:14,379 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=1030, Unknown=1, NotChecked=0, Total=1190 [2022-11-16 20:16:14,380 INFO L87 Difference]: Start difference. First operand 612 states and 1828 transitions. Second operand has 35 states, 34 states have (on average 1.5294117647058822) internal successors, (52), 34 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:16:29,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:16:29,687 INFO L93 Difference]: Finished difference Result 1154 states and 3166 transitions. [2022-11-16 20:16:29,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2022-11-16 20:16:29,687 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 34 states have (on average 1.5294117647058822) internal successors, (52), 34 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2022-11-16 20:16:29,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:16:29,690 INFO L225 Difference]: With dead ends: 1154 [2022-11-16 20:16:29,690 INFO L226 Difference]: Without dead ends: 1107 [2022-11-16 20:16:29,691 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 52 SyntacticMatches, 1 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1560 ImplicationChecksByTransitivity, 16.1s TimeCoverageRelationStatistics Valid=936, Invalid=6197, Unknown=7, NotChecked=0, Total=7140 [2022-11-16 20:16:29,691 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 323 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 789 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 323 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 2224 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 789 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1411 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-16 20:16:29,691 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [323 Valid, 0 Invalid, 2224 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 789 Invalid, 0 Unknown, 1411 Unchecked, 0.9s Time] [2022-11-16 20:16:29,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1107 states. [2022-11-16 20:16:29,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1107 to 673. [2022-11-16 20:16:29,707 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 673 states, 672 states have (on average 2.924107142857143) internal successors, (1965), 672 states have internal predecessors, (1965), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:16:29,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 673 states to 673 states and 1965 transitions. [2022-11-16 20:16:29,710 INFO L78 Accepts]: Start accepts. Automaton has 673 states and 1965 transitions. Word has length 26 [2022-11-16 20:16:29,710 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:16:29,710 INFO L495 AbstractCegarLoop]: Abstraction has 673 states and 1965 transitions. [2022-11-16 20:16:29,710 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 34 states have (on average 1.5294117647058822) internal successors, (52), 34 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:16:29,710 INFO L276 IsEmpty]: Start isEmpty. Operand 673 states and 1965 transitions. [2022-11-16 20:16:29,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-11-16 20:16:29,712 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:16:29,713 INFO L195 NwaCegarLoop]: trace histogram [8, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:16:29,726 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2022-11-16 20:16:29,918 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2022-11-16 20:16:29,919 INFO L420 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:16:29,919 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:16:29,919 INFO L85 PathProgramCache]: Analyzing trace with hash 416294873, now seen corresponding path program 36 times [2022-11-16 20:16:29,919 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:16:29,919 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [293440218] [2022-11-16 20:16:29,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:16:29,919 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:16:29,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:16:32,502 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 48 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:16:32,502 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:16:32,502 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [293440218] [2022-11-16 20:16:32,502 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [293440218] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:16:32,503 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [429177033] [2022-11-16 20:16:32,503 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 20:16:32,503 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:16:32,503 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:16:32,504 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:16:32,507 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2022-11-16 20:16:32,667 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 20:16:32,667 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:16:32,669 INFO L263 TraceCheckSpWp]: Trace formula consists of 275 conjuncts, 45 conjunts are in the unsatisfiable core [2022-11-16 20:16:32,671 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:16:33,194 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 20:16:33,195 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 21 [2022-11-16 20:16:33,216 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 7 [2022-11-16 20:16:33,221 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 47 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-16 20:16:33,221 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:16:33,295 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-16 20:16:33,296 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 27 [2022-11-16 20:16:33,525 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-16 20:16:33,525 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [429177033] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:16:33,525 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1306160873] [2022-11-16 20:16:33,526 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:16:33,526 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:16:33,526 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 9] total 33 [2022-11-16 20:16:33,526 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1785637466] [2022-11-16 20:16:33,527 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:16:33,527 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-16 20:16:33,527 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:16:33,527 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-16 20:16:33,527 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=1078, Unknown=0, NotChecked=0, Total=1190 [2022-11-16 20:16:33,528 INFO L87 Difference]: Start difference. First operand 673 states and 1965 transitions. Second operand has 35 states, 34 states have (on average 1.411764705882353) internal successors, (48), 34 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:16:35,103 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:16:35,103 INFO L93 Difference]: Finished difference Result 1218 states and 3445 transitions. [2022-11-16 20:16:35,103 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-16 20:16:35,103 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 34 states have (on average 1.411764705882353) internal successors, (48), 34 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2022-11-16 20:16:35,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:16:35,106 INFO L225 Difference]: With dead ends: 1218 [2022-11-16 20:16:35,107 INFO L226 Difference]: Without dead ends: 1170 [2022-11-16 20:16:35,107 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 353 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=271, Invalid=2081, Unknown=0, NotChecked=0, Total=2352 [2022-11-16 20:16:35,107 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 176 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 773 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 176 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 798 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 773 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-16 20:16:35,108 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [176 Valid, 0 Invalid, 798 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 773 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-16 20:16:35,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1170 states. [2022-11-16 20:16:35,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1170 to 598. [2022-11-16 20:16:35,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 598 states, 597 states have (on average 3.0117252931323284) internal successors, (1798), 597 states have internal predecessors, (1798), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:16:35,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 598 states to 598 states and 1798 transitions. [2022-11-16 20:16:35,124 INFO L78 Accepts]: Start accepts. Automaton has 598 states and 1798 transitions. Word has length 26 [2022-11-16 20:16:35,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:16:35,124 INFO L495 AbstractCegarLoop]: Abstraction has 598 states and 1798 transitions. [2022-11-16 20:16:35,125 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 34 states have (on average 1.411764705882353) internal successors, (48), 34 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:16:35,125 INFO L276 IsEmpty]: Start isEmpty. Operand 598 states and 1798 transitions. [2022-11-16 20:16:35,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-11-16 20:16:35,126 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:16:35,127 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:16:35,134 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2022-11-16 20:16:35,332 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2022-11-16 20:16:35,333 INFO L420 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:16:35,333 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:16:35,333 INFO L85 PathProgramCache]: Analyzing trace with hash -34032942, now seen corresponding path program 37 times [2022-11-16 20:16:35,333 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:16:35,333 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1025002759] [2022-11-16 20:16:35,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:16:35,333 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:16:35,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:16:36,161 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 39 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:16:36,161 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:16:36,161 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1025002759] [2022-11-16 20:16:36,161 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1025002759] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:16:36,162 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [464258685] [2022-11-16 20:16:36,162 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-16 20:16:36,162 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:16:36,162 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:16:36,163 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:16:36,182 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2022-11-16 20:16:36,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:16:36,355 INFO L263 TraceCheckSpWp]: Trace formula consists of 286 conjuncts, 45 conjunts are in the unsatisfiable core [2022-11-16 20:16:36,357 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:16:37,026 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 7 [2022-11-16 20:16:37,035 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:16:37,035 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:16:37,273 INFO L321 Elim1Store]: treesize reduction 5, result has 64.3 percent of original size [2022-11-16 20:16:37,273 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 17 [2022-11-16 20:16:38,044 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:16:38,045 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [464258685] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:16:38,045 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [821461637] [2022-11-16 20:16:38,045 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:16:38,046 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:16:38,047 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 49 [2022-11-16 20:16:38,047 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [991689144] [2022-11-16 20:16:38,047 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:16:38,047 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2022-11-16 20:16:38,047 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:16:38,048 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2022-11-16 20:16:38,048 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=326, Invalid=2224, Unknown=0, NotChecked=0, Total=2550 [2022-11-16 20:16:38,048 INFO L87 Difference]: Start difference. First operand 598 states and 1798 transitions. Second operand has 51 states, 50 states have (on average 1.38) internal successors, (69), 50 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:17:14,087 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:17:14,088 INFO L93 Difference]: Finished difference Result 6477 states and 15690 transitions. [2022-11-16 20:17:14,088 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 348 states. [2022-11-16 20:17:14,088 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 50 states have (on average 1.38) internal successors, (69), 50 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 27 [2022-11-16 20:17:14,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:17:14,106 INFO L225 Difference]: With dead ends: 6477 [2022-11-16 20:17:14,106 INFO L226 Difference]: Without dead ends: 5959 [2022-11-16 20:17:14,160 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 397 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 377 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52759 ImplicationChecksByTransitivity, 25.2s TimeCoverageRelationStatistics Valid=17108, Invalid=126154, Unknown=0, NotChecked=0, Total=143262 [2022-11-16 20:17:14,160 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 1586 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 14263 mSolverCounterSat, 183 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1586 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 14446 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 183 IncrementalHoareTripleChecker+Valid, 14263 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.7s IncrementalHoareTripleChecker+Time [2022-11-16 20:17:14,160 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1586 Valid, 0 Invalid, 14446 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [183 Valid, 14263 Invalid, 0 Unknown, 0 Unchecked, 10.7s Time] [2022-11-16 20:17:14,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5959 states. [2022-11-16 20:17:14,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5959 to 1220. [2022-11-16 20:17:14,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1220 states, 1219 states have (on average 3.269893355209188) internal successors, (3986), 1219 states have internal predecessors, (3986), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:17:14,262 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1220 states to 1220 states and 3986 transitions. [2022-11-16 20:17:14,263 INFO L78 Accepts]: Start accepts. Automaton has 1220 states and 3986 transitions. Word has length 27 [2022-11-16 20:17:14,263 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:17:14,263 INFO L495 AbstractCegarLoop]: Abstraction has 1220 states and 3986 transitions. [2022-11-16 20:17:14,263 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 50 states have (on average 1.38) internal successors, (69), 50 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:17:14,263 INFO L276 IsEmpty]: Start isEmpty. Operand 1220 states and 3986 transitions. [2022-11-16 20:17:14,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-11-16 20:17:14,267 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:17:14,267 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:17:14,278 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Ended with exit code 0 [2022-11-16 20:17:14,478 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2022-11-16 20:17:14,479 INFO L420 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:17:14,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:17:14,479 INFO L85 PathProgramCache]: Analyzing trace with hash -1998220022, now seen corresponding path program 38 times [2022-11-16 20:17:14,479 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:17:14,480 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1690942803] [2022-11-16 20:17:14,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:17:14,480 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:17:14,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:17:15,289 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 39 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:17:15,289 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:17:15,289 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1690942803] [2022-11-16 20:17:15,289 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1690942803] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:17:15,289 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [125993500] [2022-11-16 20:17:15,290 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 20:17:15,290 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:17:15,290 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:17:15,291 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:17:15,293 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2022-11-16 20:17:15,661 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-16 20:17:15,661 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:17:15,663 INFO L263 TraceCheckSpWp]: Trace formula consists of 286 conjuncts, 49 conjunts are in the unsatisfiable core [2022-11-16 20:17:15,665 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:17:15,960 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-16 20:17:16,015 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-16 20:17:16,063 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-16 20:17:16,494 INFO L321 Elim1Store]: treesize reduction 9, result has 25.0 percent of original size [2022-11-16 20:17:16,494 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 10 [2022-11-16 20:17:16,504 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 13 proven. 29 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-16 20:17:16,504 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:17:17,571 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-16 20:17:17,571 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 60 treesize of output 48 [2022-11-16 20:17:17,587 INFO L321 Elim1Store]: treesize reduction 5, result has 58.3 percent of original size [2022-11-16 20:17:17,587 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 300 treesize of output 275 [2022-11-16 20:17:17,598 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-16 20:17:17,599 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 204 treesize of output 180 [2022-11-16 20:17:17,617 INFO L321 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2022-11-16 20:17:17,618 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 244 treesize of output 196 [2022-11-16 20:17:18,039 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 10 proven. 32 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-16 20:17:18,040 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [125993500] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:17:18,040 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1465507896] [2022-11-16 20:17:18,040 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:17:18,041 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:17:18,041 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 15, 15] total 45 [2022-11-16 20:17:18,042 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1585299656] [2022-11-16 20:17:18,042 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:17:18,042 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2022-11-16 20:17:18,042 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:17:18,043 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2022-11-16 20:17:18,043 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=346, Invalid=1813, Unknown=3, NotChecked=0, Total=2162 [2022-11-16 20:17:18,043 INFO L87 Difference]: Start difference. First operand 1220 states and 3986 transitions. Second operand has 47 states, 46 states have (on average 1.4130434782608696) internal successors, (65), 46 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:17:52,882 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:17:52,882 INFO L93 Difference]: Finished difference Result 10276 states and 32289 transitions. [2022-11-16 20:17:52,882 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 244 states. [2022-11-16 20:17:52,882 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 46 states have (on average 1.4130434782608696) internal successors, (65), 46 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 27 [2022-11-16 20:17:52,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:17:52,916 INFO L225 Difference]: With dead ends: 10276 [2022-11-16 20:17:52,917 INFO L226 Difference]: Without dead ends: 9934 [2022-11-16 20:17:52,921 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 381 GetRequests, 102 SyntacticMatches, 10 SemanticMatches, 269 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28489 ImplicationChecksByTransitivity, 35.1s TimeCoverageRelationStatistics Valid=8639, Invalid=64516, Unknown=15, NotChecked=0, Total=73170 [2022-11-16 20:17:52,922 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 325 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 617 mSolverCounterSat, 62 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 325 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 4272 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 62 IncrementalHoareTripleChecker+Valid, 617 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 3593 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-16 20:17:52,922 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [325 Valid, 0 Invalid, 4272 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [62 Valid, 617 Invalid, 0 Unknown, 3593 Unchecked, 0.6s Time] [2022-11-16 20:17:52,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9934 states. [2022-11-16 20:17:53,185 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9934 to 6328. [2022-11-16 20:17:53,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6328 states, 6327 states have (on average 3.462146356883199) internal successors, (21905), 6327 states have internal predecessors, (21905), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:17:53,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6328 states to 6328 states and 21905 transitions. [2022-11-16 20:17:53,229 INFO L78 Accepts]: Start accepts. Automaton has 6328 states and 21905 transitions. Word has length 27 [2022-11-16 20:17:53,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:17:53,230 INFO L495 AbstractCegarLoop]: Abstraction has 6328 states and 21905 transitions. [2022-11-16 20:17:53,230 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 46 states have (on average 1.4130434782608696) internal successors, (65), 46 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:17:53,230 INFO L276 IsEmpty]: Start isEmpty. Operand 6328 states and 21905 transitions. [2022-11-16 20:17:53,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-11-16 20:17:53,245 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:17:53,245 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:17:53,260 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2022-11-16 20:17:53,451 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:17:53,451 INFO L420 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:17:53,452 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:17:53,452 INFO L85 PathProgramCache]: Analyzing trace with hash -466359758, now seen corresponding path program 39 times [2022-11-16 20:17:53,452 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:17:53,452 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2005865381] [2022-11-16 20:17:53,452 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:17:53,452 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:17:53,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:17:54,144 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 39 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:17:54,144 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:17:54,144 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2005865381] [2022-11-16 20:17:54,144 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2005865381] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:17:54,145 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1324743062] [2022-11-16 20:17:54,145 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 20:17:54,145 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:17:54,145 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:17:54,146 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:17:54,162 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2022-11-16 20:17:54,344 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 20:17:54,345 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:17:54,347 INFO L263 TraceCheckSpWp]: Trace formula consists of 286 conjuncts, 45 conjunts are in the unsatisfiable core [2022-11-16 20:17:54,349 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:17:55,022 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 7 [2022-11-16 20:17:55,028 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:17:55,028 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:17:55,064 INFO L321 Elim1Store]: treesize reduction 5, result has 64.3 percent of original size [2022-11-16 20:17:55,064 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 17 [2022-11-16 20:17:55,774 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:17:55,774 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1324743062] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:17:55,774 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [881249999] [2022-11-16 20:17:55,774 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:17:55,776 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:17:55,776 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 45 [2022-11-16 20:17:55,776 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [714607739] [2022-11-16 20:17:55,776 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:17:55,776 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2022-11-16 20:17:55,776 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:17:55,777 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2022-11-16 20:17:55,777 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=353, Invalid=1809, Unknown=0, NotChecked=0, Total=2162 [2022-11-16 20:17:55,777 INFO L87 Difference]: Start difference. First operand 6328 states and 21905 transitions. Second operand has 47 states, 46 states have (on average 1.4782608695652173) internal successors, (68), 46 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:18:05,059 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:18:05,059 INFO L93 Difference]: Finished difference Result 10136 states and 29202 transitions. [2022-11-16 20:18:05,060 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 162 states. [2022-11-16 20:18:05,060 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 46 states have (on average 1.4782608695652173) internal successors, (68), 46 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 27 [2022-11-16 20:18:05,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:18:05,077 INFO L225 Difference]: With dead ends: 10136 [2022-11-16 20:18:05,077 INFO L226 Difference]: Without dead ends: 9323 [2022-11-16 20:18:05,079 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 212 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 188 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12322 ImplicationChecksByTransitivity, 7.9s TimeCoverageRelationStatistics Valid=4375, Invalid=31535, Unknown=0, NotChecked=0, Total=35910 [2022-11-16 20:18:05,079 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 1020 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 2436 mSolverCounterSat, 234 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1020 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 2670 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 234 IncrementalHoareTripleChecker+Valid, 2436 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2022-11-16 20:18:05,079 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1020 Valid, 0 Invalid, 2670 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [234 Valid, 2436 Invalid, 0 Unknown, 0 Unchecked, 2.3s Time] [2022-11-16 20:18:05,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9323 states. [2022-11-16 20:18:05,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9323 to 3012. [2022-11-16 20:18:05,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3012 states, 3011 states have (on average 3.333111922949186) internal successors, (10036), 3011 states have internal predecessors, (10036), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:18:05,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3012 states to 3012 states and 10036 transitions. [2022-11-16 20:18:05,221 INFO L78 Accepts]: Start accepts. Automaton has 3012 states and 10036 transitions. Word has length 27 [2022-11-16 20:18:05,222 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:18:05,222 INFO L495 AbstractCegarLoop]: Abstraction has 3012 states and 10036 transitions. [2022-11-16 20:18:05,222 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 46 states have (on average 1.4782608695652173) internal successors, (68), 46 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:18:05,222 INFO L276 IsEmpty]: Start isEmpty. Operand 3012 states and 10036 transitions. [2022-11-16 20:18:05,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-11-16 20:18:05,229 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:18:05,229 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:18:05,240 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2022-11-16 20:18:05,435 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:18:05,435 INFO L420 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:18:05,436 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:18:05,436 INFO L85 PathProgramCache]: Analyzing trace with hash -1573272812, now seen corresponding path program 40 times [2022-11-16 20:18:05,436 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:18:05,436 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [931299094] [2022-11-16 20:18:05,436 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:18:05,436 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:18:05,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:18:06,251 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 39 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:18:06,251 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:18:06,251 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [931299094] [2022-11-16 20:18:06,251 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [931299094] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:18:06,251 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [137945787] [2022-11-16 20:18:06,251 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-16 20:18:06,251 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:18:06,251 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:18:06,254 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:18:06,255 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2022-11-16 20:18:06,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:18:06,425 INFO L263 TraceCheckSpWp]: Trace formula consists of 286 conjuncts, 42 conjunts are in the unsatisfiable core [2022-11-16 20:18:06,426 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:18:06,772 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 7 [2022-11-16 20:18:06,786 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 43 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-16 20:18:06,786 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:18:06,848 INFO L321 Elim1Store]: treesize reduction 5, result has 64.3 percent of original size [2022-11-16 20:18:06,849 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 17 [2022-11-16 20:18:06,906 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-16 20:18:06,906 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [137945787] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:18:06,906 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1326011253] [2022-11-16 20:18:06,907 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:18:06,907 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:18:06,907 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 13, 9] total 29 [2022-11-16 20:18:06,907 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1310955497] [2022-11-16 20:18:06,908 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:18:06,908 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-11-16 20:18:06,908 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:18:06,908 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-11-16 20:18:06,909 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=835, Unknown=0, NotChecked=0, Total=930 [2022-11-16 20:18:06,909 INFO L87 Difference]: Start difference. First operand 3012 states and 10036 transitions. Second operand has 31 states, 30 states have (on average 1.6333333333333333) internal successors, (49), 30 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:18:13,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:18:13,742 INFO L93 Difference]: Finished difference Result 8109 states and 23763 transitions. [2022-11-16 20:18:13,743 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 128 states. [2022-11-16 20:18:13,743 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 30 states have (on average 1.6333333333333333) internal successors, (49), 30 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 27 [2022-11-16 20:18:13,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:18:13,755 INFO L225 Difference]: With dead ends: 8109 [2022-11-16 20:18:13,755 INFO L226 Difference]: Without dead ends: 6679 [2022-11-16 20:18:13,756 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 39 SyntacticMatches, 1 SemanticMatches, 146 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7278 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=1624, Invalid=20132, Unknown=0, NotChecked=0, Total=21756 [2022-11-16 20:18:13,757 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 1249 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 2583 mSolverCounterSat, 144 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1249 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 2727 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 144 IncrementalHoareTripleChecker+Valid, 2583 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2022-11-16 20:18:13,757 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1249 Valid, 0 Invalid, 2727 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [144 Valid, 2583 Invalid, 0 Unknown, 0 Unchecked, 2.0s Time] [2022-11-16 20:18:13,764 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6679 states. [2022-11-16 20:18:13,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6679 to 1632. [2022-11-16 20:18:13,823 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1632 states, 1631 states have (on average 3.0165542611894542) internal successors, (4920), 1631 states have internal predecessors, (4920), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:18:13,828 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1632 states to 1632 states and 4920 transitions. [2022-11-16 20:18:13,828 INFO L78 Accepts]: Start accepts. Automaton has 1632 states and 4920 transitions. Word has length 27 [2022-11-16 20:18:13,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:18:13,828 INFO L495 AbstractCegarLoop]: Abstraction has 1632 states and 4920 transitions. [2022-11-16 20:18:13,829 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 30 states have (on average 1.6333333333333333) internal successors, (49), 30 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:18:13,829 INFO L276 IsEmpty]: Start isEmpty. Operand 1632 states and 4920 transitions. [2022-11-16 20:18:13,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-11-16 20:18:13,831 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:18:13,831 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:18:13,841 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Forceful destruction successful, exit code 0 [2022-11-16 20:18:14,037 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable42 [2022-11-16 20:18:14,037 INFO L420 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:18:14,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:18:14,037 INFO L85 PathProgramCache]: Analyzing trace with hash -382100872, now seen corresponding path program 41 times [2022-11-16 20:18:14,037 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:18:14,038 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1663452320] [2022-11-16 20:18:14,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:18:14,038 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:18:14,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:18:14,912 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 39 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:18:14,912 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:18:14,913 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1663452320] [2022-11-16 20:18:14,913 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1663452320] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:18:14,913 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [327896510] [2022-11-16 20:18:14,913 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 20:18:14,913 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:18:14,913 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:18:14,915 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:18:14,928 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2022-11-16 20:18:15,518 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-16 20:18:15,518 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:18:15,521 INFO L263 TraceCheckSpWp]: Trace formula consists of 286 conjuncts, 49 conjunts are in the unsatisfiable core [2022-11-16 20:18:15,523 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:18:15,780 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-16 20:18:15,845 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-16 20:18:16,057 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 20:18:16,058 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 20 [2022-11-16 20:18:16,452 INFO L321 Elim1Store]: treesize reduction 9, result has 25.0 percent of original size [2022-11-16 20:18:16,453 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 10 [2022-11-16 20:18:16,463 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 10 proven. 29 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-16 20:18:16,463 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:18:19,881 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-16 20:18:19,881 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 57 treesize of output 45 [2022-11-16 20:18:19,895 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-16 20:18:19,895 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 178 treesize of output 166 [2022-11-16 20:18:19,906 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 130 treesize of output 106 [2022-11-16 20:18:19,921 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-16 20:18:19,921 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 84 treesize of output 78 [2022-11-16 20:18:20,598 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 10 proven. 29 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-16 20:18:20,598 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [327896510] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:18:20,598 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [817348108] [2022-11-16 20:18:20,599 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:18:20,600 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:18:20,600 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 15, 15] total 46 [2022-11-16 20:18:20,600 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1575183360] [2022-11-16 20:18:20,600 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:18:20,600 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2022-11-16 20:18:20,600 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:18:20,601 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2022-11-16 20:18:20,601 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=314, Invalid=1940, Unknown=2, NotChecked=0, Total=2256 [2022-11-16 20:18:20,602 INFO L87 Difference]: Start difference. First operand 1632 states and 4920 transitions. Second operand has 48 states, 47 states have (on average 1.3829787234042554) internal successors, (65), 47 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:18:23,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:18:23,775 INFO L93 Difference]: Finished difference Result 2285 states and 6445 transitions. [2022-11-16 20:18:23,775 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2022-11-16 20:18:23,775 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 47 states have (on average 1.3829787234042554) internal successors, (65), 47 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 27 [2022-11-16 20:18:23,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:18:23,779 INFO L225 Difference]: With dead ends: 2285 [2022-11-16 20:18:23,779 INFO L226 Difference]: Without dead ends: 2276 [2022-11-16 20:18:23,779 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1616 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=978, Invalid=6160, Unknown=2, NotChecked=0, Total=7140 [2022-11-16 20:18:23,780 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 78 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 255 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 78 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 531 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 255 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 252 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-16 20:18:23,780 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [78 Valid, 0 Invalid, 531 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 255 Invalid, 0 Unknown, 252 Unchecked, 0.2s Time] [2022-11-16 20:18:23,783 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2276 states. [2022-11-16 20:18:23,802 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2276 to 1782. [2022-11-16 20:18:23,804 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1782 states, 1781 states have (on average 2.991016282987086) internal successors, (5327), 1781 states have internal predecessors, (5327), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:18:23,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1782 states to 1782 states and 5327 transitions. [2022-11-16 20:18:23,835 INFO L78 Accepts]: Start accepts. Automaton has 1782 states and 5327 transitions. Word has length 27 [2022-11-16 20:18:23,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:18:23,835 INFO L495 AbstractCegarLoop]: Abstraction has 1782 states and 5327 transitions. [2022-11-16 20:18:23,836 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 47 states have (on average 1.3829787234042554) internal successors, (65), 47 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:18:23,836 INFO L276 IsEmpty]: Start isEmpty. Operand 1782 states and 5327 transitions. [2022-11-16 20:18:23,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-11-16 20:18:23,838 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:18:23,838 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:18:23,850 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2022-11-16 20:18:24,044 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable43 [2022-11-16 20:18:24,045 INFO L420 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:18:24,045 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:18:24,046 INFO L85 PathProgramCache]: Analyzing trace with hash 1149759392, now seen corresponding path program 42 times [2022-11-16 20:18:24,046 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:18:24,046 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1485139440] [2022-11-16 20:18:24,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:18:24,046 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:18:24,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:18:24,818 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 39 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:18:24,818 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:18:24,818 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1485139440] [2022-11-16 20:18:24,818 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1485139440] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:18:24,818 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2096921994] [2022-11-16 20:18:24,819 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 20:18:24,819 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:18:24,819 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:18:24,820 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:18:24,822 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2022-11-16 20:18:24,999 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 20:18:24,999 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:18:25,002 INFO L263 TraceCheckSpWp]: Trace formula consists of 286 conjuncts, 46 conjunts are in the unsatisfiable core [2022-11-16 20:18:25,003 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:18:25,603 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 20:18:25,603 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 20 [2022-11-16 20:18:25,955 INFO L321 Elim1Store]: treesize reduction 9, result has 25.0 percent of original size [2022-11-16 20:18:25,955 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 10 [2022-11-16 20:18:25,961 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 39 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:18:25,961 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:18:26,053 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-16 20:18:26,054 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 27 [2022-11-16 20:18:27,130 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 39 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:18:27,130 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2096921994] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:18:27,131 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [641588863] [2022-11-16 20:18:27,131 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:18:27,131 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:18:27,131 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 46 [2022-11-16 20:18:27,131 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1019738363] [2022-11-16 20:18:27,132 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:18:27,132 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2022-11-16 20:18:27,132 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:18:27,132 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2022-11-16 20:18:27,133 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=308, Invalid=1948, Unknown=0, NotChecked=0, Total=2256 [2022-11-16 20:18:27,133 INFO L87 Difference]: Start difference. First operand 1782 states and 5327 transitions. Second operand has 48 states, 47 states have (on average 1.3617021276595744) internal successors, (64), 47 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:18:31,862 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:18:31,862 INFO L93 Difference]: Finished difference Result 4893 states and 16405 transitions. [2022-11-16 20:18:31,863 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2022-11-16 20:18:31,863 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 47 states have (on average 1.3617021276595744) internal successors, (64), 47 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 27 [2022-11-16 20:18:31,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:18:31,872 INFO L225 Difference]: With dead ends: 4893 [2022-11-16 20:18:31,873 INFO L226 Difference]: Without dead ends: 4886 [2022-11-16 20:18:31,873 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2587 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=1538, Invalid=9174, Unknown=0, NotChecked=0, Total=10712 [2022-11-16 20:18:31,874 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 123 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 2216 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 123 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 2643 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 2216 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 376 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2022-11-16 20:18:31,874 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [123 Valid, 0 Invalid, 2643 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 2216 Invalid, 0 Unknown, 376 Unchecked, 1.7s Time] [2022-11-16 20:18:31,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4886 states. [2022-11-16 20:18:31,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4886 to 3488. [2022-11-16 20:18:31,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3488 states, 3487 states have (on average 3.370232291367938) internal successors, (11752), 3487 states have internal predecessors, (11752), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:18:31,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3488 states to 3488 states and 11752 transitions. [2022-11-16 20:18:31,946 INFO L78 Accepts]: Start accepts. Automaton has 3488 states and 11752 transitions. Word has length 27 [2022-11-16 20:18:31,946 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:18:31,946 INFO L495 AbstractCegarLoop]: Abstraction has 3488 states and 11752 transitions. [2022-11-16 20:18:31,946 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 47 states have (on average 1.3617021276595744) internal successors, (64), 47 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:18:31,946 INFO L276 IsEmpty]: Start isEmpty. Operand 3488 states and 11752 transitions. [2022-11-16 20:18:31,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-11-16 20:18:31,950 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:18:31,951 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:18:31,963 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2022-11-16 20:18:32,158 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable44 [2022-11-16 20:18:32,159 INFO L420 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:18:32,159 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:18:32,159 INFO L85 PathProgramCache]: Analyzing trace with hash 1392787320, now seen corresponding path program 43 times [2022-11-16 20:18:32,159 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:18:32,159 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [370056125] [2022-11-16 20:18:32,159 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:18:32,159 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:18:32,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:18:33,082 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 39 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:18:33,082 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:18:33,082 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [370056125] [2022-11-16 20:18:33,082 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [370056125] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:18:33,082 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1776087543] [2022-11-16 20:18:33,083 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-16 20:18:33,083 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:18:33,083 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:18:33,084 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:18:33,086 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2022-11-16 20:18:33,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:18:33,276 INFO L263 TraceCheckSpWp]: Trace formula consists of 286 conjuncts, 52 conjunts are in the unsatisfiable core [2022-11-16 20:18:33,278 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:18:33,852 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 20:18:33,853 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 21 [2022-11-16 20:18:34,113 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 7 [2022-11-16 20:18:34,119 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:18:34,119 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:18:34,187 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-16 20:18:34,187 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 27 [2022-11-16 20:18:34,924 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:18:34,925 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1776087543] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:18:34,925 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1426594540] [2022-11-16 20:18:34,925 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:18:34,925 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:18:34,926 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 46 [2022-11-16 20:18:34,927 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [46824139] [2022-11-16 20:18:34,927 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:18:34,927 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2022-11-16 20:18:34,927 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:18:34,927 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2022-11-16 20:18:34,928 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=299, Invalid=1957, Unknown=0, NotChecked=0, Total=2256 [2022-11-16 20:18:34,928 INFO L87 Difference]: Start difference. First operand 3488 states and 11752 transitions. Second operand has 48 states, 47 states have (on average 1.3617021276595744) internal successors, (64), 47 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:18:39,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:18:39,986 INFO L93 Difference]: Finished difference Result 5125 states and 15415 transitions. [2022-11-16 20:18:39,986 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2022-11-16 20:18:39,987 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 47 states have (on average 1.3617021276595744) internal successors, (64), 47 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 27 [2022-11-16 20:18:39,987 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:18:39,996 INFO L225 Difference]: With dead ends: 5125 [2022-11-16 20:18:39,996 INFO L226 Difference]: Without dead ends: 5112 [2022-11-16 20:18:39,997 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2549 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=1669, Invalid=8431, Unknown=0, NotChecked=0, Total=10100 [2022-11-16 20:18:39,997 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 692 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 2222 mSolverCounterSat, 136 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 692 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 2358 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 136 IncrementalHoareTripleChecker+Valid, 2222 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2022-11-16 20:18:39,997 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [692 Valid, 0 Invalid, 2358 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [136 Valid, 2222 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2022-11-16 20:18:40,005 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5112 states. [2022-11-16 20:18:40,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5112 to 3482. [2022-11-16 20:18:40,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3482 states, 3481 states have (on average 3.3711577133007755) internal successors, (11735), 3481 states have internal predecessors, (11735), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:18:40,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3482 states to 3482 states and 11735 transitions. [2022-11-16 20:18:40,068 INFO L78 Accepts]: Start accepts. Automaton has 3482 states and 11735 transitions. Word has length 27 [2022-11-16 20:18:40,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:18:40,068 INFO L495 AbstractCegarLoop]: Abstraction has 3482 states and 11735 transitions. [2022-11-16 20:18:40,068 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 47 states have (on average 1.3617021276595744) internal successors, (64), 47 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:18:40,069 INFO L276 IsEmpty]: Start isEmpty. Operand 3482 states and 11735 transitions. [2022-11-16 20:18:40,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-11-16 20:18:40,071 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:18:40,071 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:18:40,079 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Ended with exit code 0 [2022-11-16 20:18:40,271 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2022-11-16 20:18:40,271 INFO L420 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:18:40,272 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:18:40,272 INFO L85 PathProgramCache]: Analyzing trace with hash -1055969000, now seen corresponding path program 44 times [2022-11-16 20:18:40,272 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:18:40,272 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [186820559] [2022-11-16 20:18:40,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:18:40,272 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:18:40,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:18:40,418 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 25 proven. 10 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-16 20:18:40,418 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:18:40,418 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [186820559] [2022-11-16 20:18:40,418 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [186820559] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:18:40,418 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1239055134] [2022-11-16 20:18:40,418 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 20:18:40,418 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:18:40,419 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:18:40,419 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:18:40,421 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2022-11-16 20:18:40,669 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-16 20:18:40,669 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:18:40,671 INFO L263 TraceCheckSpWp]: Trace formula consists of 296 conjuncts, 21 conjunts are in the unsatisfiable core [2022-11-16 20:18:40,672 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:18:40,958 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 25 proven. 20 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-16 20:18:40,958 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:18:41,382 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 20 proven. 25 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-16 20:18:41,382 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1239055134] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:18:41,382 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1582576552] [2022-11-16 20:18:41,383 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:18:41,383 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:18:41,383 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 14, 14] total 33 [2022-11-16 20:18:41,383 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [211587826] [2022-11-16 20:18:41,383 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:18:41,383 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-11-16 20:18:41,384 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:18:41,384 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-11-16 20:18:41,384 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=309, Invalid=813, Unknown=0, NotChecked=0, Total=1122 [2022-11-16 20:18:41,384 INFO L87 Difference]: Start difference. First operand 3482 states and 11735 transitions. Second operand has 34 states, 34 states have (on average 2.0) internal successors, (68), 33 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:18:42,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:18:42,143 INFO L93 Difference]: Finished difference Result 2507 states and 5761 transitions. [2022-11-16 20:18:42,144 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-11-16 20:18:42,144 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.0) internal successors, (68), 33 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2022-11-16 20:18:42,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:18:42,146 INFO L225 Difference]: With dead ends: 2507 [2022-11-16 20:18:42,146 INFO L226 Difference]: Without dead ends: 944 [2022-11-16 20:18:42,147 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 851 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=871, Invalid=2099, Unknown=0, NotChecked=0, Total=2970 [2022-11-16 20:18:42,147 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 243 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 440 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 243 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 481 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 440 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-16 20:18:42,147 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [243 Valid, 0 Invalid, 481 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 440 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-16 20:18:42,149 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 944 states. [2022-11-16 20:18:42,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 944 to 686. [2022-11-16 20:18:42,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 686 states, 685 states have (on average 2.8277372262773723) internal successors, (1937), 685 states have internal predecessors, (1937), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:18:42,162 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 686 states to 686 states and 1937 transitions. [2022-11-16 20:18:42,162 INFO L78 Accepts]: Start accepts. Automaton has 686 states and 1937 transitions. Word has length 28 [2022-11-16 20:18:42,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:18:42,162 INFO L495 AbstractCegarLoop]: Abstraction has 686 states and 1937 transitions. [2022-11-16 20:18:42,162 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 2.0) internal successors, (68), 33 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:18:42,162 INFO L276 IsEmpty]: Start isEmpty. Operand 686 states and 1937 transitions. [2022-11-16 20:18:42,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-11-16 20:18:42,163 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:18:42,163 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:18:42,168 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Forceful destruction successful, exit code 0 [2022-11-16 20:18:42,366 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2022-11-16 20:18:42,367 INFO L420 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:18:42,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:18:42,367 INFO L85 PathProgramCache]: Analyzing trace with hash -51876584, now seen corresponding path program 45 times [2022-11-16 20:18:42,367 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:18:42,367 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [430183621] [2022-11-16 20:18:42,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:18:42,367 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:18:42,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:18:43,144 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 6 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:18:43,144 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:18:43,145 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [430183621] [2022-11-16 20:18:43,145 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [430183621] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:18:43,145 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1933172642] [2022-11-16 20:18:43,145 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 20:18:43,145 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:18:43,145 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:18:43,146 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:18:43,148 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2022-11-16 20:18:43,342 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 20:18:43,342 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:18:43,344 INFO L263 TraceCheckSpWp]: Trace formula consists of 314 conjuncts, 45 conjunts are in the unsatisfiable core [2022-11-16 20:18:43,346 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:18:44,341 INFO L321 Elim1Store]: treesize reduction 9, result has 25.0 percent of original size [2022-11-16 20:18:44,342 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 10 [2022-11-16 20:18:44,351 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 10 proven. 53 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:18:44,351 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:18:44,389 INFO L321 Elim1Store]: treesize reduction 5, result has 64.3 percent of original size [2022-11-16 20:18:44,389 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 17 [2022-11-16 20:18:45,563 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 10 proven. 53 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:18:45,563 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1933172642] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:18:45,563 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1147050976] [2022-11-16 20:18:45,564 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:18:45,564 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:18:45,564 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 52 [2022-11-16 20:18:45,564 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [932793607] [2022-11-16 20:18:45,564 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:18:45,565 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2022-11-16 20:18:45,565 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:18:45,565 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2022-11-16 20:18:45,565 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=427, Invalid=2435, Unknown=0, NotChecked=0, Total=2862 [2022-11-16 20:18:45,566 INFO L87 Difference]: Start difference. First operand 686 states and 1937 transitions. Second operand has 54 states, 53 states have (on average 1.3396226415094339) internal successors, (71), 53 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:18:59,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:18:59,113 INFO L93 Difference]: Finished difference Result 2008 states and 6655 transitions. [2022-11-16 20:18:59,113 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 161 states. [2022-11-16 20:18:59,114 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 53 states have (on average 1.3396226415094339) internal successors, (71), 53 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2022-11-16 20:18:59,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:18:59,117 INFO L225 Difference]: With dead ends: 2008 [2022-11-16 20:18:59,117 INFO L226 Difference]: Without dead ends: 1951 [2022-11-16 20:18:59,119 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 205 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13078 ImplicationChecksByTransitivity, 12.1s TimeCoverageRelationStatistics Valid=4974, Invalid=37668, Unknown=0, NotChecked=0, Total=42642 [2022-11-16 20:18:59,119 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 156 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3693 mSolverCounterSat, 67 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 156 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 7492 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 67 IncrementalHoareTripleChecker+Valid, 3693 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 3732 IncrementalHoareTripleChecker+Unchecked, 2.8s IncrementalHoareTripleChecker+Time [2022-11-16 20:18:59,119 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [156 Valid, 0 Invalid, 7492 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [67 Valid, 3693 Invalid, 0 Unknown, 3732 Unchecked, 2.8s Time] [2022-11-16 20:18:59,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1951 states. [2022-11-16 20:18:59,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1951 to 1601. [2022-11-16 20:18:59,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1601 states, 1600 states have (on average 3.3925) internal successors, (5428), 1600 states have internal predecessors, (5428), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:18:59,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1601 states to 1601 states and 5428 transitions. [2022-11-16 20:18:59,146 INFO L78 Accepts]: Start accepts. Automaton has 1601 states and 5428 transitions. Word has length 30 [2022-11-16 20:18:59,146 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:18:59,146 INFO L495 AbstractCegarLoop]: Abstraction has 1601 states and 5428 transitions. [2022-11-16 20:18:59,147 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 53 states have (on average 1.3396226415094339) internal successors, (71), 53 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:18:59,147 INFO L276 IsEmpty]: Start isEmpty. Operand 1601 states and 5428 transitions. [2022-11-16 20:18:59,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-11-16 20:18:59,149 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:18:59,149 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:18:59,156 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Forceful destruction successful, exit code 0 [2022-11-16 20:18:59,349 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47,45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:18:59,349 INFO L420 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:18:59,350 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:18:59,350 INFO L85 PathProgramCache]: Analyzing trace with hash 1479983680, now seen corresponding path program 46 times [2022-11-16 20:18:59,350 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:18:59,350 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1540737743] [2022-11-16 20:18:59,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:18:59,350 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:18:59,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:19:00,158 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 6 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:19:00,158 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:19:00,158 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1540737743] [2022-11-16 20:19:00,158 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1540737743] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:19:00,158 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [290779583] [2022-11-16 20:19:00,158 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-16 20:19:00,159 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:19:00,159 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:19:00,160 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:19:00,163 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2022-11-16 20:19:00,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:19:00,356 INFO L263 TraceCheckSpWp]: Trace formula consists of 314 conjuncts, 50 conjunts are in the unsatisfiable core [2022-11-16 20:19:00,357 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:19:01,231 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 7 [2022-11-16 20:19:01,237 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 63 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:19:01,237 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:19:01,278 INFO L321 Elim1Store]: treesize reduction 5, result has 64.3 percent of original size [2022-11-16 20:19:01,279 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 17 [2022-11-16 20:19:02,109 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 63 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:19:02,110 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [290779583] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:19:02,110 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2051218635] [2022-11-16 20:19:02,110 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:19:02,110 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:19:02,110 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 52 [2022-11-16 20:19:02,111 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1626517265] [2022-11-16 20:19:02,111 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:19:02,111 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2022-11-16 20:19:02,111 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:19:02,112 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2022-11-16 20:19:02,112 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=408, Invalid=2454, Unknown=0, NotChecked=0, Total=2862 [2022-11-16 20:19:02,112 INFO L87 Difference]: Start difference. First operand 1601 states and 5428 transitions. Second operand has 54 states, 53 states have (on average 1.3962264150943395) internal successors, (74), 53 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:20:38,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:20:38,695 INFO L93 Difference]: Finished difference Result 16791 states and 45473 transitions. [2022-11-16 20:20:38,696 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 672 states. [2022-11-16 20:20:38,696 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 53 states have (on average 1.3962264150943395) internal successors, (74), 53 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2022-11-16 20:20:38,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:20:38,729 INFO L225 Difference]: With dead ends: 16791 [2022-11-16 20:20:38,729 INFO L226 Difference]: Without dead ends: 15825 [2022-11-16 20:20:38,747 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 730 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 704 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 211367 ImplicationChecksByTransitivity, 67.3s TimeCoverageRelationStatistics Valid=48437, Invalid=449293, Unknown=0, NotChecked=0, Total=497730 [2022-11-16 20:20:38,748 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 2106 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 31970 mSolverCounterSat, 291 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 21.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2106 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 32261 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.2s SdHoareTripleChecker+Time, 291 IncrementalHoareTripleChecker+Valid, 31970 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 24.9s IncrementalHoareTripleChecker+Time [2022-11-16 20:20:38,748 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2106 Valid, 0 Invalid, 32261 Unknown, 0 Unchecked, 0.2s Time], IncrementalHoareTripleChecker [291 Valid, 31970 Invalid, 0 Unknown, 0 Unchecked, 24.9s Time] [2022-11-16 20:20:38,764 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15825 states. [2022-11-16 20:20:38,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15825 to 3246. [2022-11-16 20:20:38,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3246 states, 3245 states have (on average 3.475808936825886) internal successors, (11279), 3245 states have internal predecessors, (11279), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:20:38,994 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3246 states to 3246 states and 11279 transitions. [2022-11-16 20:20:38,994 INFO L78 Accepts]: Start accepts. Automaton has 3246 states and 11279 transitions. Word has length 30 [2022-11-16 20:20:38,994 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:20:38,994 INFO L495 AbstractCegarLoop]: Abstraction has 3246 states and 11279 transitions. [2022-11-16 20:20:38,994 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 53 states have (on average 1.3962264150943395) internal successors, (74), 53 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:20:38,994 INFO L276 IsEmpty]: Start isEmpty. Operand 3246 states and 11279 transitions. [2022-11-16 20:20:38,999 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-11-16 20:20:38,999 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:20:38,999 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:20:39,010 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Forceful destruction successful, exit code 0 [2022-11-16 20:20:39,205 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2022-11-16 20:20:39,205 INFO L420 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:20:39,206 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:20:39,206 INFO L85 PathProgramCache]: Analyzing trace with hash -812133920, now seen corresponding path program 47 times [2022-11-16 20:20:39,206 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:20:39,206 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1350200632] [2022-11-16 20:20:39,206 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:20:39,206 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:20:39,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:20:40,141 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 10 proven. 53 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:20:40,141 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:20:40,141 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1350200632] [2022-11-16 20:20:40,141 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1350200632] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:20:40,141 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1958563785] [2022-11-16 20:20:40,141 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 20:20:40,142 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:20:40,142 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:20:40,143 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:20:40,162 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2022-11-16 20:20:40,473 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-16 20:20:40,473 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:20:40,475 INFO L263 TraceCheckSpWp]: Trace formula consists of 314 conjuncts, 51 conjunts are in the unsatisfiable core [2022-11-16 20:20:40,477 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:20:40,801 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-16 20:20:40,861 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-16 20:20:40,912 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-16 20:20:41,466 INFO L321 Elim1Store]: treesize reduction 9, result has 25.0 percent of original size [2022-11-16 20:20:41,466 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 10 [2022-11-16 20:20:41,480 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 19 proven. 38 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-16 20:20:41,480 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:20:42,687 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-16 20:20:42,688 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 60 treesize of output 48 [2022-11-16 20:20:42,702 INFO L321 Elim1Store]: treesize reduction 5, result has 58.3 percent of original size [2022-11-16 20:20:42,703 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 140 treesize of output 131 [2022-11-16 20:20:42,715 INFO L321 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2022-11-16 20:20:42,715 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 124 treesize of output 100 [2022-11-16 20:20:42,728 INFO L321 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2022-11-16 20:20:42,729 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 79 treesize of output 67 [2022-11-16 20:20:43,247 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 15 proven. 42 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-16 20:20:43,247 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1958563785] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:20:43,247 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1364343269] [2022-11-16 20:20:43,247 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:20:43,249 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:20:43,249 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 17, 17] total 52 [2022-11-16 20:20:43,249 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1562078398] [2022-11-16 20:20:43,249 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:20:43,250 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2022-11-16 20:20:43,250 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:20:43,250 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2022-11-16 20:20:43,251 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=446, Invalid=2415, Unknown=1, NotChecked=0, Total=2862 [2022-11-16 20:20:43,251 INFO L87 Difference]: Start difference. First operand 3246 states and 11279 transitions. Second operand has 54 states, 53 states have (on average 1.3584905660377358) internal successors, (72), 53 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:21:01,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:21:01,688 INFO L93 Difference]: Finished difference Result 17636 states and 54498 transitions. [2022-11-16 20:21:01,688 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 171 states. [2022-11-16 20:21:01,688 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 53 states have (on average 1.3584905660377358) internal successors, (72), 53 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2022-11-16 20:21:01,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:21:01,724 INFO L225 Difference]: With dead ends: 17636 [2022-11-16 20:21:01,725 INFO L226 Difference]: Without dead ends: 16093 [2022-11-16 20:21:01,726 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 312 GetRequests, 87 SyntacticMatches, 11 SemanticMatches, 214 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15731 ImplicationChecksByTransitivity, 18.8s TimeCoverageRelationStatistics Valid=7596, Invalid=38843, Unknown=1, NotChecked=0, Total=46440 [2022-11-16 20:21:01,727 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 483 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 1166 mSolverCounterSat, 78 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 483 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 6922 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 78 IncrementalHoareTripleChecker+Valid, 1166 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 5678 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-11-16 20:21:01,727 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [483 Valid, 0 Invalid, 6922 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [78 Valid, 1166 Invalid, 0 Unknown, 5678 Unchecked, 1.0s Time] [2022-11-16 20:21:01,744 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16093 states. [2022-11-16 20:21:02,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16093 to 10047. [2022-11-16 20:21:02,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10047 states, 10046 states have (on average 3.4009556042205853) internal successors, (34166), 10046 states have internal predecessors, (34166), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:21:02,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10047 states to 10047 states and 34166 transitions. [2022-11-16 20:21:02,109 INFO L78 Accepts]: Start accepts. Automaton has 10047 states and 34166 transitions. Word has length 30 [2022-11-16 20:21:02,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:21:02,109 INFO L495 AbstractCegarLoop]: Abstraction has 10047 states and 34166 transitions. [2022-11-16 20:21:02,109 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 53 states have (on average 1.3584905660377358) internal successors, (72), 53 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:21:02,110 INFO L276 IsEmpty]: Start isEmpty. Operand 10047 states and 34166 transitions. [2022-11-16 20:21:02,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-11-16 20:21:02,118 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:21:02,118 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:21:02,126 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Forceful destruction successful, exit code 0 [2022-11-16 20:21:02,319 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2022-11-16 20:21:02,319 INFO L420 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:21:02,319 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:21:02,319 INFO L85 PathProgramCache]: Analyzing trace with hash 719726344, now seen corresponding path program 48 times [2022-11-16 20:21:02,319 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:21:02,319 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [12618483] [2022-11-16 20:21:02,319 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:21:02,320 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:21:02,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:21:03,096 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 10 proven. 53 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:21:03,096 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:21:03,097 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [12618483] [2022-11-16 20:21:03,097 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [12618483] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:21:03,097 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1515051111] [2022-11-16 20:21:03,097 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 20:21:03,097 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:21:03,097 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:21:03,098 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:21:03,100 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2022-11-16 20:21:03,301 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 20:21:03,301 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:21:03,304 INFO L263 TraceCheckSpWp]: Trace formula consists of 314 conjuncts, 45 conjunts are in the unsatisfiable core [2022-11-16 20:21:03,305 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:21:04,255 INFO L321 Elim1Store]: treesize reduction 9, result has 25.0 percent of original size [2022-11-16 20:21:04,255 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 10 [2022-11-16 20:21:04,261 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 6 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:21:04,261 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:21:04,298 INFO L321 Elim1Store]: treesize reduction 5, result has 64.3 percent of original size [2022-11-16 20:21:04,298 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 17 [2022-11-16 20:21:05,606 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 10 proven. 53 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:21:05,607 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1515051111] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:21:05,607 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1172593924] [2022-11-16 20:21:05,607 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:21:05,608 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:21:05,608 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 53 [2022-11-16 20:21:05,609 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [557515069] [2022-11-16 20:21:05,609 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:21:05,609 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2022-11-16 20:21:05,609 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:21:05,609 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2022-11-16 20:21:05,610 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=480, Invalid=2490, Unknown=0, NotChecked=0, Total=2970 [2022-11-16 20:21:05,610 INFO L87 Difference]: Start difference. First operand 10047 states and 34166 transitions. Second operand has 55 states, 54 states have (on average 1.4074074074074074) internal successors, (76), 54 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:21:07,865 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:21:07,866 INFO L93 Difference]: Finished difference Result 3107 states and 8371 transitions. [2022-11-16 20:21:07,866 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-11-16 20:21:07,866 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 54 states have (on average 1.4074074074074074) internal successors, (76), 54 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2022-11-16 20:21:07,866 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:21:07,872 INFO L225 Difference]: With dead ends: 3107 [2022-11-16 20:21:07,872 INFO L226 Difference]: Without dead ends: 3052 [2022-11-16 20:21:07,872 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1622 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=1127, Invalid=5679, Unknown=0, NotChecked=0, Total=6806 [2022-11-16 20:21:07,873 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 272 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 1446 mSolverCounterSat, 54 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 272 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 2028 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 54 IncrementalHoareTripleChecker+Valid, 1446 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 528 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-11-16 20:21:07,873 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [272 Valid, 0 Invalid, 2028 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [54 Valid, 1446 Invalid, 0 Unknown, 528 Unchecked, 1.1s Time] [2022-11-16 20:21:07,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3052 states. [2022-11-16 20:21:07,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3052 to 1584. [2022-11-16 20:21:07,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1584 states, 1583 states have (on average 2.897662665824384) internal successors, (4587), 1583 states have internal predecessors, (4587), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:21:07,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1584 states to 1584 states and 4587 transitions. [2022-11-16 20:21:07,907 INFO L78 Accepts]: Start accepts. Automaton has 1584 states and 4587 transitions. Word has length 30 [2022-11-16 20:21:07,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:21:07,908 INFO L495 AbstractCegarLoop]: Abstraction has 1584 states and 4587 transitions. [2022-11-16 20:21:07,908 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 54 states have (on average 1.4074074074074074) internal successors, (76), 54 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:21:07,908 INFO L276 IsEmpty]: Start isEmpty. Operand 1584 states and 4587 transitions. [2022-11-16 20:21:07,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-11-16 20:21:07,910 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:21:07,910 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:21:07,915 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Forceful destruction successful, exit code 0 [2022-11-16 20:21:08,110 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:21:08,111 INFO L420 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:21:08,111 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:21:08,111 INFO L85 PathProgramCache]: Analyzing trace with hash -714537336, now seen corresponding path program 49 times [2022-11-16 20:21:08,111 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:21:08,111 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [773915703] [2022-11-16 20:21:08,111 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:21:08,111 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:21:08,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:21:09,015 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 10 proven. 53 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:21:09,015 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:21:09,015 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [773915703] [2022-11-16 20:21:09,016 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [773915703] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:21:09,016 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [841037945] [2022-11-16 20:21:09,016 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-16 20:21:09,016 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:21:09,016 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:21:09,017 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:21:09,019 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2022-11-16 20:21:09,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:21:09,222 INFO L263 TraceCheckSpWp]: Trace formula consists of 314 conjuncts, 45 conjunts are in the unsatisfiable core [2022-11-16 20:21:09,223 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:21:10,249 INFO L321 Elim1Store]: treesize reduction 9, result has 25.0 percent of original size [2022-11-16 20:21:10,250 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 10 [2022-11-16 20:21:10,256 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 6 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:21:10,256 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:21:10,292 INFO L321 Elim1Store]: treesize reduction 5, result has 64.3 percent of original size [2022-11-16 20:21:10,292 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 17 [2022-11-16 20:21:11,508 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 10 proven. 53 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:21:11,508 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [841037945] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:21:11,508 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [623004021] [2022-11-16 20:21:11,509 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:21:11,510 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:21:11,510 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 53 [2022-11-16 20:21:11,510 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [393484919] [2022-11-16 20:21:11,510 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:21:11,510 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2022-11-16 20:21:11,510 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:21:11,511 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2022-11-16 20:21:11,511 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=480, Invalid=2490, Unknown=0, NotChecked=0, Total=2970 [2022-11-16 20:21:11,511 INFO L87 Difference]: Start difference. First operand 1584 states and 4587 transitions. Second operand has 55 states, 54 states have (on average 1.4074074074074074) internal successors, (76), 54 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:21:13,722 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:21:13,722 INFO L93 Difference]: Finished difference Result 2474 states and 6451 transitions. [2022-11-16 20:21:13,723 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-11-16 20:21:13,723 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 54 states have (on average 1.4074074074074074) internal successors, (76), 54 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2022-11-16 20:21:13,723 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:21:13,727 INFO L225 Difference]: With dead ends: 2474 [2022-11-16 20:21:13,727 INFO L226 Difference]: Without dead ends: 2453 [2022-11-16 20:21:13,728 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1622 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=1127, Invalid=5679, Unknown=0, NotChecked=0, Total=6806 [2022-11-16 20:21:13,728 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 276 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 1138 mSolverCounterSat, 56 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 276 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 1670 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 56 IncrementalHoareTripleChecker+Valid, 1138 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 476 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-16 20:21:13,729 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [276 Valid, 0 Invalid, 1670 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [56 Valid, 1138 Invalid, 0 Unknown, 476 Unchecked, 0.9s Time] [2022-11-16 20:21:13,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2453 states. [2022-11-16 20:21:13,754 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2453 to 1601. [2022-11-16 20:21:13,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1601 states, 1600 states have (on average 2.8875) internal successors, (4620), 1600 states have internal predecessors, (4620), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:21:13,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1601 states to 1601 states and 4620 transitions. [2022-11-16 20:21:13,759 INFO L78 Accepts]: Start accepts. Automaton has 1601 states and 4620 transitions. Word has length 30 [2022-11-16 20:21:13,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:21:13,759 INFO L495 AbstractCegarLoop]: Abstraction has 1601 states and 4620 transitions. [2022-11-16 20:21:13,759 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 54 states have (on average 1.4074074074074074) internal successors, (76), 54 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:21:13,759 INFO L276 IsEmpty]: Start isEmpty. Operand 1601 states and 4620 transitions. [2022-11-16 20:21:13,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-11-16 20:21:13,761 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:21:13,761 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:21:13,767 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Forceful destruction successful, exit code 0 [2022-11-16 20:21:13,962 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:21:13,962 INFO L420 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:21:13,963 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:21:13,963 INFO L85 PathProgramCache]: Analyzing trace with hash -357431800, now seen corresponding path program 50 times [2022-11-16 20:21:13,963 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:21:13,963 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1083009441] [2022-11-16 20:21:13,963 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:21:13,963 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:21:14,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:21:14,758 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 10 proven. 53 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:21:14,758 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:21:14,758 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1083009441] [2022-11-16 20:21:14,758 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1083009441] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:21:14,758 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [488842020] [2022-11-16 20:21:14,758 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 20:21:14,758 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:21:14,759 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:21:14,759 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:21:14,762 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2022-11-16 20:21:15,538 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-16 20:21:15,538 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:21:15,540 INFO L263 TraceCheckSpWp]: Trace formula consists of 314 conjuncts, 40 conjunts are in the unsatisfiable core [2022-11-16 20:21:15,541 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:21:16,407 INFO L321 Elim1Store]: treesize reduction 9, result has 25.0 percent of original size [2022-11-16 20:21:16,407 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 10 [2022-11-16 20:21:16,414 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 24 proven. 33 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-16 20:21:16,414 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:21:16,881 INFO L321 Elim1Store]: treesize reduction 5, result has 58.3 percent of original size [2022-11-16 20:21:16,881 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 24 treesize of output 15 [2022-11-16 20:21:17,576 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 15 proven. 42 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-16 20:21:17,576 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [488842020] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:21:17,576 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [796410352] [2022-11-16 20:21:17,577 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:21:17,577 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:21:17,577 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 16, 16] total 50 [2022-11-16 20:21:17,577 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1853272063] [2022-11-16 20:21:17,577 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:21:17,578 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2022-11-16 20:21:17,578 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:21:17,578 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2022-11-16 20:21:17,578 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=445, Invalid=2207, Unknown=0, NotChecked=0, Total=2652 [2022-11-16 20:21:17,578 INFO L87 Difference]: Start difference. First operand 1601 states and 4620 transitions. Second operand has 52 states, 51 states have (on average 1.5294117647058822) internal successors, (78), 51 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:21:46,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:21:46,965 INFO L93 Difference]: Finished difference Result 8137 states and 21977 transitions. [2022-11-16 20:21:46,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 243 states. [2022-11-16 20:21:46,965 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 51 states have (on average 1.5294117647058822) internal successors, (78), 51 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2022-11-16 20:21:46,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:21:46,977 INFO L225 Difference]: With dead ends: 8137 [2022-11-16 20:21:46,977 INFO L226 Difference]: Without dead ends: 7653 [2022-11-16 20:21:46,981 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 358 GetRequests, 62 SyntacticMatches, 11 SemanticMatches, 285 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27249 ImplicationChecksByTransitivity, 28.3s TimeCoverageRelationStatistics Valid=14681, Invalid=67401, Unknown=0, NotChecked=0, Total=82082 [2022-11-16 20:21:46,982 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 320 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 1555 mSolverCounterSat, 109 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 320 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 3877 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 109 IncrementalHoareTripleChecker+Valid, 1555 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 2213 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2022-11-16 20:21:46,982 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [320 Valid, 0 Invalid, 3877 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [109 Valid, 1555 Invalid, 0 Unknown, 2213 Unchecked, 1.3s Time] [2022-11-16 20:21:46,992 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7653 states. [2022-11-16 20:21:47,094 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7653 to 3312. [2022-11-16 20:21:47,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3312 states, 3311 states have (on average 2.9211718514044094) internal successors, (9672), 3311 states have internal predecessors, (9672), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:21:47,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3312 states to 3312 states and 9672 transitions. [2022-11-16 20:21:47,275 INFO L78 Accepts]: Start accepts. Automaton has 3312 states and 9672 transitions. Word has length 30 [2022-11-16 20:21:47,275 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:21:47,275 INFO L495 AbstractCegarLoop]: Abstraction has 3312 states and 9672 transitions. [2022-11-16 20:21:47,276 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 51 states have (on average 1.5294117647058822) internal successors, (78), 51 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:21:47,276 INFO L276 IsEmpty]: Start isEmpty. Operand 3312 states and 9672 transitions. [2022-11-16 20:21:47,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-11-16 20:21:47,283 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:21:47,283 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:21:47,295 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Forceful destruction successful, exit code 0 [2022-11-16 20:21:47,489 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52,50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:21:47,489 INFO L420 AbstractCegarLoop]: === Iteration 54 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:21:47,490 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:21:47,490 INFO L85 PathProgramCache]: Analyzing trace with hash -523672298, now seen corresponding path program 51 times [2022-11-16 20:21:47,490 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:21:47,490 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [221462460] [2022-11-16 20:21:47,490 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:21:47,490 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:21:47,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:21:48,592 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 6 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:21:48,592 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:21:48,592 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [221462460] [2022-11-16 20:21:48,592 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [221462460] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:21:48,592 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1386185510] [2022-11-16 20:21:48,593 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 20:21:48,593 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:21:48,593 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:21:48,597 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:21:48,599 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2022-11-16 20:21:48,801 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 20:21:48,801 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:21:48,803 INFO L263 TraceCheckSpWp]: Trace formula consists of 314 conjuncts, 50 conjunts are in the unsatisfiable core [2022-11-16 20:21:48,805 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:21:49,777 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 7 [2022-11-16 20:21:49,787 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 63 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:21:49,787 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:21:50,012 INFO L321 Elim1Store]: treesize reduction 5, result has 64.3 percent of original size [2022-11-16 20:21:50,012 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 17 [2022-11-16 20:21:51,229 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 63 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:21:51,229 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1386185510] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:21:51,229 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1679237341] [2022-11-16 20:21:51,230 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:21:51,230 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:21:51,230 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 58 [2022-11-16 20:21:51,230 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2132270700] [2022-11-16 20:21:51,230 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:21:51,231 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2022-11-16 20:21:51,231 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:21:51,231 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2022-11-16 20:21:51,232 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=434, Invalid=3106, Unknown=0, NotChecked=0, Total=3540 [2022-11-16 20:21:51,232 INFO L87 Difference]: Start difference. First operand 3312 states and 9672 transitions. Second operand has 60 states, 59 states have (on average 1.3220338983050848) internal successors, (78), 59 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:22:27,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:22:27,373 INFO L93 Difference]: Finished difference Result 11903 states and 30641 transitions. [2022-11-16 20:22:27,374 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 294 states. [2022-11-16 20:22:27,374 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 59 states have (on average 1.3220338983050848) internal successors, (78), 59 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2022-11-16 20:22:27,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:22:27,393 INFO L225 Difference]: With dead ends: 11903 [2022-11-16 20:22:27,393 INFO L226 Difference]: Without dead ends: 11083 [2022-11-16 20:22:27,398 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 355 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 335 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40200 ImplicationChecksByTransitivity, 27.6s TimeCoverageRelationStatistics Valid=10419, Invalid=102813, Unknown=0, NotChecked=0, Total=113232 [2022-11-16 20:22:27,398 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 1807 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 11795 mSolverCounterSat, 477 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1807 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 12272 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 477 IncrementalHoareTripleChecker+Valid, 11795 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.6s IncrementalHoareTripleChecker+Time [2022-11-16 20:22:27,398 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1807 Valid, 0 Invalid, 12272 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [477 Valid, 11795 Invalid, 0 Unknown, 0 Unchecked, 9.6s Time] [2022-11-16 20:22:27,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11083 states. [2022-11-16 20:22:27,514 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11083 to 4260. [2022-11-16 20:22:27,518 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4260 states, 4259 states have (on average 3.021601314862644) internal successors, (12869), 4259 states have internal predecessors, (12869), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:22:27,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4260 states to 4260 states and 12869 transitions. [2022-11-16 20:22:27,527 INFO L78 Accepts]: Start accepts. Automaton has 4260 states and 12869 transitions. Word has length 30 [2022-11-16 20:22:27,527 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:22:27,527 INFO L495 AbstractCegarLoop]: Abstraction has 4260 states and 12869 transitions. [2022-11-16 20:22:27,527 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 59 states have (on average 1.3220338983050848) internal successors, (78), 59 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:22:27,527 INFO L276 IsEmpty]: Start isEmpty. Operand 4260 states and 12869 transitions. [2022-11-16 20:22:27,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-11-16 20:22:27,534 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:22:27,534 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:22:27,543 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Forceful destruction successful, exit code 0 [2022-11-16 20:22:27,735 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable53 [2022-11-16 20:22:27,735 INFO L420 AbstractCegarLoop]: === Iteration 55 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:22:27,735 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:22:27,735 INFO L85 PathProgramCache]: Analyzing trace with hash -98725088, now seen corresponding path program 52 times [2022-11-16 20:22:27,735 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:22:27,735 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1764005327] [2022-11-16 20:22:27,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:22:27,736 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:22:27,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:22:28,604 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 10 proven. 53 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:22:28,604 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:22:28,604 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1764005327] [2022-11-16 20:22:28,604 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1764005327] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:22:28,605 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1776200197] [2022-11-16 20:22:28,605 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-16 20:22:28,605 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:22:28,605 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:22:28,606 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:22:28,608 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Waiting until timeout for monitored process [2022-11-16 20:22:28,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:22:28,814 INFO L263 TraceCheckSpWp]: Trace formula consists of 314 conjuncts, 50 conjunts are in the unsatisfiable core [2022-11-16 20:22:28,815 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:22:29,644 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 7 [2022-11-16 20:22:29,653 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 63 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:22:29,653 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:22:29,679 INFO L321 Elim1Store]: treesize reduction 5, result has 64.3 percent of original size [2022-11-16 20:22:29,680 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 17 [2022-11-16 20:22:30,601 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 63 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:22:30,601 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1776200197] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:22:30,601 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [481901786] [2022-11-16 20:22:30,602 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:22:30,603 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:22:30,603 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 55 [2022-11-16 20:22:30,603 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1425483547] [2022-11-16 20:22:30,603 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:22:30,603 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2022-11-16 20:22:30,604 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:22:30,604 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2022-11-16 20:22:30,604 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=536, Invalid=2656, Unknown=0, NotChecked=0, Total=3192 [2022-11-16 20:22:30,605 INFO L87 Difference]: Start difference. First operand 4260 states and 12869 transitions. Second operand has 57 states, 56 states have (on average 1.3392857142857142) internal successors, (75), 56 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:22:49,594 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:22:49,594 INFO L93 Difference]: Finished difference Result 12536 states and 32623 transitions. [2022-11-16 20:22:49,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 248 states. [2022-11-16 20:22:49,595 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 56 states have (on average 1.3392857142857142) internal successors, (75), 56 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2022-11-16 20:22:49,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:22:49,615 INFO L225 Difference]: With dead ends: 12536 [2022-11-16 20:22:49,615 INFO L226 Difference]: Without dead ends: 11985 [2022-11-16 20:22:49,620 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 302 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 279 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29032 ImplicationChecksByTransitivity, 13.6s TimeCoverageRelationStatistics Valid=7959, Invalid=70721, Unknown=0, NotChecked=0, Total=78680 [2022-11-16 20:22:49,620 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 1458 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 7748 mSolverCounterSat, 339 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1458 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 8087 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 339 IncrementalHoareTripleChecker+Valid, 7748 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.2s IncrementalHoareTripleChecker+Time [2022-11-16 20:22:49,621 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1458 Valid, 0 Invalid, 8087 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [339 Valid, 7748 Invalid, 0 Unknown, 0 Unchecked, 6.2s Time] [2022-11-16 20:22:49,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11985 states. [2022-11-16 20:22:49,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11985 to 4365. [2022-11-16 20:22:49,822 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4365 states, 4364 states have (on average 3.018790100824931) internal successors, (13174), 4364 states have internal predecessors, (13174), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:22:49,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4365 states to 4365 states and 13174 transitions. [2022-11-16 20:22:49,836 INFO L78 Accepts]: Start accepts. Automaton has 4365 states and 13174 transitions. Word has length 30 [2022-11-16 20:22:49,836 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:22:49,836 INFO L495 AbstractCegarLoop]: Abstraction has 4365 states and 13174 transitions. [2022-11-16 20:22:49,836 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 56 states have (on average 1.3392857142857142) internal successors, (75), 56 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:22:49,836 INFO L276 IsEmpty]: Start isEmpty. Operand 4365 states and 13174 transitions. [2022-11-16 20:22:49,842 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-11-16 20:22:49,842 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:22:49,842 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:22:49,848 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Forceful destruction successful, exit code 0 [2022-11-16 20:22:50,048 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable54 [2022-11-16 20:22:50,048 INFO L420 AbstractCegarLoop]: === Iteration 56 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:22:50,049 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:22:50,049 INFO L85 PathProgramCache]: Analyzing trace with hash -639206442, now seen corresponding path program 53 times [2022-11-16 20:22:50,049 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:22:50,049 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1942365357] [2022-11-16 20:22:50,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:22:50,049 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:22:50,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:22:50,910 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 10 proven. 53 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:22:50,910 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:22:50,911 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1942365357] [2022-11-16 20:22:50,911 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1942365357] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:22:50,911 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [283025309] [2022-11-16 20:22:50,911 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 20:22:50,911 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:22:50,911 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:22:50,912 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:22:50,915 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2022-11-16 20:22:51,379 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-16 20:22:51,380 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:22:51,382 INFO L263 TraceCheckSpWp]: Trace formula consists of 304 conjuncts, 68 conjunts are in the unsatisfiable core [2022-11-16 20:22:51,383 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:22:52,258 INFO L321 Elim1Store]: treesize reduction 40, result has 7.0 percent of original size [2022-11-16 20:22:52,258 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 48 treesize of output 16 [2022-11-16 20:22:52,268 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 27 proven. 33 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-16 20:22:52,268 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:22:52,837 INFO L321 Elim1Store]: treesize reduction 15, result has 63.4 percent of original size [2022-11-16 20:22:52,837 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 51 treesize of output 41 [2022-11-16 20:22:53,354 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 1 proven. 59 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-16 20:22:53,354 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [283025309] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:22:53,354 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1348693651] [2022-11-16 20:22:53,355 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:22:53,356 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:22:53,356 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 18, 18] total 53 [2022-11-16 20:22:53,356 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1522350855] [2022-11-16 20:22:53,356 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:22:53,357 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2022-11-16 20:22:53,357 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:22:53,357 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2022-11-16 20:22:53,358 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=497, Invalid=2473, Unknown=0, NotChecked=0, Total=2970 [2022-11-16 20:22:53,358 INFO L87 Difference]: Start difference. First operand 4365 states and 13174 transitions. Second operand has 55 states, 54 states have (on average 1.3518518518518519) internal successors, (73), 54 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:22:56,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:22:56,350 INFO L93 Difference]: Finished difference Result 8422 states and 23533 transitions. [2022-11-16 20:22:56,351 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2022-11-16 20:22:56,351 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 54 states have (on average 1.3518518518518519) internal successors, (73), 54 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2022-11-16 20:22:56,351 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:22:56,367 INFO L225 Difference]: With dead ends: 8422 [2022-11-16 20:22:56,367 INFO L226 Difference]: Without dead ends: 8376 [2022-11-16 20:22:56,368 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1779 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=1263, Invalid=6047, Unknown=0, NotChecked=0, Total=7310 [2022-11-16 20:22:56,368 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 477 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 796 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 477 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 1807 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 796 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 976 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-16 20:22:56,368 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [477 Valid, 0 Invalid, 1807 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 796 Invalid, 0 Unknown, 976 Unchecked, 0.7s Time] [2022-11-16 20:22:56,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8376 states. [2022-11-16 20:22:56,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8376 to 5623. [2022-11-16 20:22:56,489 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5623 states, 5622 states have (on average 3.032728566346496) internal successors, (17050), 5622 states have internal predecessors, (17050), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:22:56,508 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5623 states to 5623 states and 17050 transitions. [2022-11-16 20:22:56,508 INFO L78 Accepts]: Start accepts. Automaton has 5623 states and 17050 transitions. Word has length 30 [2022-11-16 20:22:56,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:22:56,509 INFO L495 AbstractCegarLoop]: Abstraction has 5623 states and 17050 transitions. [2022-11-16 20:22:56,509 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 54 states have (on average 1.3518518518518519) internal successors, (73), 54 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:22:56,509 INFO L276 IsEmpty]: Start isEmpty. Operand 5623 states and 17050 transitions. [2022-11-16 20:22:56,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-11-16 20:22:56,517 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:22:56,518 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:22:56,528 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Ended with exit code 0 [2022-11-16 20:22:56,728 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable55 [2022-11-16 20:22:56,729 INFO L420 AbstractCegarLoop]: === Iteration 57 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:22:56,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:22:56,729 INFO L85 PathProgramCache]: Analyzing trace with hash -240999328, now seen corresponding path program 54 times [2022-11-16 20:22:56,729 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:22:56,729 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [260097097] [2022-11-16 20:22:56,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:22:56,729 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:22:56,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:22:57,714 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 6 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:22:57,714 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:22:57,714 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [260097097] [2022-11-16 20:22:57,714 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [260097097] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:22:57,714 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1119106665] [2022-11-16 20:22:57,714 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 20:22:57,714 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:22:57,714 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:22:57,715 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:22:57,717 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Waiting until timeout for monitored process [2022-11-16 20:22:57,927 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 20:22:57,927 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:22:57,929 INFO L263 TraceCheckSpWp]: Trace formula consists of 314 conjuncts, 50 conjunts are in the unsatisfiable core [2022-11-16 20:22:57,930 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:22:58,838 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 7 [2022-11-16 20:22:58,849 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 1 proven. 62 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:22:58,849 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:22:58,874 INFO L321 Elim1Store]: treesize reduction 5, result has 58.3 percent of original size [2022-11-16 20:22:58,874 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 24 treesize of output 15 [2022-11-16 20:22:59,967 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 1 proven. 62 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:22:59,967 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1119106665] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:22:59,967 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [860523748] [2022-11-16 20:22:59,968 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:22:59,968 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:22:59,968 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 57 [2022-11-16 20:22:59,968 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [923396988] [2022-11-16 20:22:59,968 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:22:59,969 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2022-11-16 20:22:59,969 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:22:59,969 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2022-11-16 20:22:59,969 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=535, Invalid=2887, Unknown=0, NotChecked=0, Total=3422 [2022-11-16 20:22:59,970 INFO L87 Difference]: Start difference. First operand 5623 states and 17050 transitions. Second operand has 59 states, 58 states have (on average 1.3275862068965518) internal successors, (77), 58 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:23:08,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:23:08,602 INFO L93 Difference]: Finished difference Result 9430 states and 26269 transitions. [2022-11-16 20:23:08,603 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2022-11-16 20:23:08,603 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 58 states have (on average 1.3275862068965518) internal successors, (77), 58 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2022-11-16 20:23:08,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:23:08,622 INFO L225 Difference]: With dead ends: 9430 [2022-11-16 20:23:08,622 INFO L226 Difference]: Without dead ends: 9183 [2022-11-16 20:23:08,623 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 134 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5330 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=2397, Invalid=15963, Unknown=0, NotChecked=0, Total=18360 [2022-11-16 20:23:08,624 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 985 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 4595 mSolverCounterSat, 304 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 985 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 4899 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 304 IncrementalHoareTripleChecker+Valid, 4595 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.8s IncrementalHoareTripleChecker+Time [2022-11-16 20:23:08,624 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [985 Valid, 0 Invalid, 4899 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [304 Valid, 4595 Invalid, 0 Unknown, 0 Unchecked, 3.8s Time] [2022-11-16 20:23:08,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9183 states. [2022-11-16 20:23:08,738 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9183 to 5575. [2022-11-16 20:23:08,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5575 states, 5574 states have (on average 3.0315751704341585) internal successors, (16898), 5574 states have internal predecessors, (16898), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:23:08,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5575 states to 5575 states and 16898 transitions. [2022-11-16 20:23:08,756 INFO L78 Accepts]: Start accepts. Automaton has 5575 states and 16898 transitions. Word has length 30 [2022-11-16 20:23:08,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:23:08,756 INFO L495 AbstractCegarLoop]: Abstraction has 5575 states and 16898 transitions. [2022-11-16 20:23:08,756 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 58 states have (on average 1.3275862068965518) internal successors, (77), 58 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:23:08,757 INFO L276 IsEmpty]: Start isEmpty. Operand 5575 states and 16898 transitions. [2022-11-16 20:23:08,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-11-16 20:23:08,762 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:23:08,762 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:23:08,768 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Forceful destruction successful, exit code 0 [2022-11-16 20:23:08,963 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable56 [2022-11-16 20:23:08,963 INFO L420 AbstractCegarLoop]: === Iteration 58 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:23:08,963 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:23:08,963 INFO L85 PathProgramCache]: Analyzing trace with hash 2123752574, now seen corresponding path program 55 times [2022-11-16 20:23:08,963 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:23:08,963 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1813089335] [2022-11-16 20:23:08,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:23:08,964 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:23:09,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:23:09,857 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 10 proven. 53 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:23:09,857 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:23:09,858 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1813089335] [2022-11-16 20:23:09,858 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1813089335] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:23:09,858 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1069804210] [2022-11-16 20:23:09,858 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-16 20:23:09,858 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:23:09,858 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:23:09,859 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:23:09,861 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Waiting until timeout for monitored process [2022-11-16 20:23:10,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:23:10,099 INFO L263 TraceCheckSpWp]: Trace formula consists of 314 conjuncts, 58 conjunts are in the unsatisfiable core [2022-11-16 20:23:10,100 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:23:11,127 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 7 [2022-11-16 20:23:11,133 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 63 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:23:11,133 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:23:11,370 INFO L321 Elim1Store]: treesize reduction 5, result has 64.3 percent of original size [2022-11-16 20:23:11,371 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 17 [2022-11-16 20:23:12,319 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 63 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:23:12,319 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1069804210] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:23:12,319 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [600882169] [2022-11-16 20:23:12,319 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:23:12,320 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:23:12,320 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 58 [2022-11-16 20:23:12,321 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1586774925] [2022-11-16 20:23:12,321 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:23:12,321 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2022-11-16 20:23:12,321 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:23:12,322 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2022-11-16 20:23:12,322 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=462, Invalid=3078, Unknown=0, NotChecked=0, Total=3540 [2022-11-16 20:23:12,322 INFO L87 Difference]: Start difference. First operand 5575 states and 16898 transitions. Second operand has 60 states, 59 states have (on average 1.423728813559322) internal successors, (84), 59 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:23:32,110 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:23:32,110 INFO L93 Difference]: Finished difference Result 13314 states and 35378 transitions. [2022-11-16 20:23:32,110 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 263 states. [2022-11-16 20:23:32,110 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 59 states have (on average 1.423728813559322) internal successors, (84), 59 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2022-11-16 20:23:32,111 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:23:32,136 INFO L225 Difference]: With dead ends: 13314 [2022-11-16 20:23:32,136 INFO L226 Difference]: Without dead ends: 12407 [2022-11-16 20:23:32,139 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 319 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 299 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33710 ImplicationChecksByTransitivity, 17.0s TimeCoverageRelationStatistics Valid=9309, Invalid=80991, Unknown=0, NotChecked=0, Total=90300 [2022-11-16 20:23:32,140 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 1520 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 4667 mSolverCounterSat, 319 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1520 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 4986 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 319 IncrementalHoareTripleChecker+Valid, 4667 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.2s IncrementalHoareTripleChecker+Time [2022-11-16 20:23:32,140 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1520 Valid, 0 Invalid, 4986 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [319 Valid, 4667 Invalid, 0 Unknown, 0 Unchecked, 4.2s Time] [2022-11-16 20:23:32,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12407 states. [2022-11-16 20:23:32,278 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12407 to 5653. [2022-11-16 20:23:32,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5653 states, 5652 states have (on average 3.0537862703467797) internal successors, (17260), 5652 states have internal predecessors, (17260), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:23:32,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5653 states to 5653 states and 17260 transitions. [2022-11-16 20:23:32,297 INFO L78 Accepts]: Start accepts. Automaton has 5653 states and 17260 transitions. Word has length 30 [2022-11-16 20:23:32,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:23:32,297 INFO L495 AbstractCegarLoop]: Abstraction has 5653 states and 17260 transitions. [2022-11-16 20:23:32,297 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 59 states have (on average 1.423728813559322) internal successors, (84), 59 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:23:32,297 INFO L276 IsEmpty]: Start isEmpty. Operand 5653 states and 17260 transitions. [2022-11-16 20:23:32,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-11-16 20:23:32,302 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:23:32,302 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:23:32,308 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Forceful destruction successful, exit code 0 [2022-11-16 20:23:32,504 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable57 [2022-11-16 20:23:32,505 INFO L420 AbstractCegarLoop]: === Iteration 59 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:23:32,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:23:32,505 INFO L85 PathProgramCache]: Analyzing trace with hash 231397198, now seen corresponding path program 56 times [2022-11-16 20:23:32,505 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:23:32,505 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1536669859] [2022-11-16 20:23:32,505 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:23:32,505 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:23:32,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:23:33,269 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 10 proven. 53 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:23:33,269 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:23:33,270 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1536669859] [2022-11-16 20:23:33,270 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1536669859] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:23:33,270 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [331294644] [2022-11-16 20:23:33,270 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 20:23:33,270 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:23:33,270 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:23:33,271 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:23:33,273 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Waiting until timeout for monitored process [2022-11-16 20:23:33,960 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-16 20:23:33,960 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:23:33,963 INFO L263 TraceCheckSpWp]: Trace formula consists of 304 conjuncts, 67 conjunts are in the unsatisfiable core [2022-11-16 20:23:33,964 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:23:34,999 INFO L321 Elim1Store]: treesize reduction 38, result has 7.3 percent of original size [2022-11-16 20:23:34,999 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 41 treesize of output 16 [2022-11-16 20:23:35,009 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 19 proven. 41 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-16 20:23:35,009 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:23:35,657 INFO L321 Elim1Store]: treesize reduction 15, result has 63.4 percent of original size [2022-11-16 20:23:35,657 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 50 treesize of output 41 [2022-11-16 20:23:36,213 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 2 proven. 58 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-16 20:23:36,213 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [331294644] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:23:36,213 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1184479902] [2022-11-16 20:23:36,214 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:23:36,214 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:23:36,214 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 18, 18] total 54 [2022-11-16 20:23:36,218 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [24746686] [2022-11-16 20:23:36,218 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:23:36,219 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2022-11-16 20:23:36,219 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:23:36,219 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2022-11-16 20:23:36,220 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=479, Invalid=2601, Unknown=0, NotChecked=0, Total=3080 [2022-11-16 20:23:36,221 INFO L87 Difference]: Start difference. First operand 5653 states and 17260 transitions. Second operand has 56 states, 55 states have (on average 1.3818181818181818) internal successors, (76), 55 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:23:39,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:23:39,906 INFO L93 Difference]: Finished difference Result 9902 states and 28321 transitions. [2022-11-16 20:23:39,906 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2022-11-16 20:23:39,906 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 55 states have (on average 1.3818181818181818) internal successors, (76), 55 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2022-11-16 20:23:39,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:23:39,925 INFO L225 Difference]: With dead ends: 9902 [2022-11-16 20:23:39,925 INFO L226 Difference]: Without dead ends: 9860 [2022-11-16 20:23:39,926 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 42 SyntacticMatches, 2 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2037 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=1581, Invalid=7349, Unknown=0, NotChecked=0, Total=8930 [2022-11-16 20:23:39,926 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 165 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 374 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 165 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 842 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 374 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 440 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-16 20:23:39,926 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [165 Valid, 0 Invalid, 842 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 374 Invalid, 0 Unknown, 440 Unchecked, 0.3s Time] [2022-11-16 20:23:39,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9860 states. [2022-11-16 20:23:40,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9860 to 6936. [2022-11-16 20:23:40,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6936 states, 6935 states have (on average 3.0382119682768565) internal successors, (21070), 6935 states have internal predecessors, (21070), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:23:40,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6936 states to 6936 states and 21070 transitions. [2022-11-16 20:23:40,076 INFO L78 Accepts]: Start accepts. Automaton has 6936 states and 21070 transitions. Word has length 30 [2022-11-16 20:23:40,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:23:40,076 INFO L495 AbstractCegarLoop]: Abstraction has 6936 states and 21070 transitions. [2022-11-16 20:23:40,076 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 55 states have (on average 1.3818181818181818) internal successors, (76), 55 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:23:40,076 INFO L276 IsEmpty]: Start isEmpty. Operand 6936 states and 21070 transitions. [2022-11-16 20:23:40,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-11-16 20:23:40,082 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:23:40,083 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:23:40,089 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Forceful destruction successful, exit code 0 [2022-11-16 20:23:40,285 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable58,56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:23:40,285 INFO L420 AbstractCegarLoop]: === Iteration 60 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:23:40,286 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:23:40,286 INFO L85 PathProgramCache]: Analyzing trace with hash 1763257462, now seen corresponding path program 57 times [2022-11-16 20:23:40,286 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:23:40,286 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [152760897] [2022-11-16 20:23:40,286 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:23:40,286 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:23:40,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:23:41,191 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 10 proven. 53 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:23:41,191 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:23:41,191 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [152760897] [2022-11-16 20:23:41,191 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [152760897] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:23:41,192 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1173177897] [2022-11-16 20:23:41,192 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 20:23:41,192 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:23:41,192 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:23:41,193 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:23:41,195 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Waiting until timeout for monitored process [2022-11-16 20:23:41,417 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 20:23:41,417 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:23:41,419 INFO L263 TraceCheckSpWp]: Trace formula consists of 314 conjuncts, 50 conjunts are in the unsatisfiable core [2022-11-16 20:23:41,420 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:23:42,312 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 7 [2022-11-16 20:23:42,318 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 63 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:23:42,318 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:23:42,347 INFO L321 Elim1Store]: treesize reduction 5, result has 64.3 percent of original size [2022-11-16 20:23:42,347 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 17 [2022-11-16 20:23:43,361 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 63 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:23:43,361 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1173177897] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:23:43,361 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1202792496] [2022-11-16 20:23:43,362 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:23:43,362 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:23:43,362 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 56 [2022-11-16 20:23:43,362 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [221512213] [2022-11-16 20:23:43,362 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:23:43,362 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2022-11-16 20:23:43,363 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:23:43,363 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2022-11-16 20:23:43,363 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=573, Invalid=2733, Unknown=0, NotChecked=0, Total=3306 [2022-11-16 20:23:43,363 INFO L87 Difference]: Start difference. First operand 6936 states and 21070 transitions. Second operand has 58 states, 57 states have (on average 1.3859649122807018) internal successors, (79), 57 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:23:54,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:23:54,479 INFO L93 Difference]: Finished difference Result 13944 states and 39037 transitions. [2022-11-16 20:23:54,480 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 147 states. [2022-11-16 20:23:54,480 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 57 states have (on average 1.3859649122807018) internal successors, (79), 57 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2022-11-16 20:23:54,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:23:54,509 INFO L225 Difference]: With dead ends: 13944 [2022-11-16 20:23:54,510 INFO L226 Difference]: Without dead ends: 13467 [2022-11-16 20:23:54,511 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 181 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10683 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=3619, Invalid=29687, Unknown=0, NotChecked=0, Total=33306 [2022-11-16 20:23:54,512 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 1176 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 5134 mSolverCounterSat, 364 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1176 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 5498 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 364 IncrementalHoareTripleChecker+Valid, 5134 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.3s IncrementalHoareTripleChecker+Time [2022-11-16 20:23:54,512 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1176 Valid, 0 Invalid, 5498 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [364 Valid, 5134 Invalid, 0 Unknown, 0 Unchecked, 4.3s Time] [2022-11-16 20:23:54,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13467 states. [2022-11-16 20:23:54,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13467 to 7316. [2022-11-16 20:23:54,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7316 states, 7315 states have (on average 3.091866028708134) internal successors, (22617), 7315 states have internal predecessors, (22617), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:23:54,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7316 states to 7316 states and 22617 transitions. [2022-11-16 20:23:54,722 INFO L78 Accepts]: Start accepts. Automaton has 7316 states and 22617 transitions. Word has length 30 [2022-11-16 20:23:54,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:23:54,722 INFO L495 AbstractCegarLoop]: Abstraction has 7316 states and 22617 transitions. [2022-11-16 20:23:54,722 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 57 states have (on average 1.3859649122807018) internal successors, (79), 57 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:23:54,722 INFO L276 IsEmpty]: Start isEmpty. Operand 7316 states and 22617 transitions. [2022-11-16 20:23:54,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-11-16 20:23:54,729 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:23:54,729 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:23:54,739 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Forceful destruction successful, exit code 0 [2022-11-16 20:23:54,930 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable59 [2022-11-16 20:23:54,930 INFO L420 AbstractCegarLoop]: === Iteration 61 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:23:54,930 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:23:54,930 INFO L85 PathProgramCache]: Analyzing trace with hash 2030529752, now seen corresponding path program 58 times [2022-11-16 20:23:54,930 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:23:54,930 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1461672885] [2022-11-16 20:23:54,931 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:23:54,931 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:23:54,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:23:55,706 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 10 proven. 53 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:23:55,707 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:23:55,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1461672885] [2022-11-16 20:23:55,707 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1461672885] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:23:55,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1122584393] [2022-11-16 20:23:55,707 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-16 20:23:55,707 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:23:55,707 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:23:55,708 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:23:55,711 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Waiting until timeout for monitored process [2022-11-16 20:23:55,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:23:55,936 INFO L263 TraceCheckSpWp]: Trace formula consists of 314 conjuncts, 50 conjunts are in the unsatisfiable core [2022-11-16 20:23:55,938 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:23:56,784 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 7 [2022-11-16 20:23:56,793 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 63 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:23:56,793 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:23:56,825 INFO L321 Elim1Store]: treesize reduction 5, result has 64.3 percent of original size [2022-11-16 20:23:56,826 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 17 [2022-11-16 20:23:57,723 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 63 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:23:57,723 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1122584393] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:23:57,723 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1799484718] [2022-11-16 20:23:57,724 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:23:57,724 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:23:57,724 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 54 [2022-11-16 20:23:57,724 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1354184822] [2022-11-16 20:23:57,724 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:23:57,725 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2022-11-16 20:23:57,725 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:23:57,725 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2022-11-16 20:23:57,725 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=501, Invalid=2579, Unknown=0, NotChecked=0, Total=3080 [2022-11-16 20:23:57,725 INFO L87 Difference]: Start difference. First operand 7316 states and 22617 transitions. Second operand has 56 states, 55 states have (on average 1.3454545454545455) internal successors, (74), 55 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:24:15,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:24:15,808 INFO L93 Difference]: Finished difference Result 33678 states and 96713 transitions. [2022-11-16 20:24:15,808 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 229 states. [2022-11-16 20:24:15,808 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 55 states have (on average 1.3454545454545455) internal successors, (74), 55 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2022-11-16 20:24:15,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:24:15,896 INFO L225 Difference]: With dead ends: 33678 [2022-11-16 20:24:15,896 INFO L226 Difference]: Without dead ends: 32162 [2022-11-16 20:24:15,900 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 285 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 261 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24743 ImplicationChecksByTransitivity, 13.3s TimeCoverageRelationStatistics Valid=9632, Invalid=59274, Unknown=0, NotChecked=0, Total=68906 [2022-11-16 20:24:15,900 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 1073 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 6796 mSolverCounterSat, 318 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1073 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 7114 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 318 IncrementalHoareTripleChecker+Valid, 6796 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.6s IncrementalHoareTripleChecker+Time [2022-11-16 20:24:15,901 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1073 Valid, 0 Invalid, 7114 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [318 Valid, 6796 Invalid, 0 Unknown, 0 Unchecked, 5.6s Time] [2022-11-16 20:24:15,945 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32162 states. [2022-11-16 20:24:16,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32162 to 11103. [2022-11-16 20:24:16,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11103 states, 11102 states have (on average 3.054134390199964) internal successors, (33907), 11102 states have internal predecessors, (33907), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:24:16,397 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11103 states to 11103 states and 33907 transitions. [2022-11-16 20:24:16,397 INFO L78 Accepts]: Start accepts. Automaton has 11103 states and 33907 transitions. Word has length 30 [2022-11-16 20:24:16,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:24:16,397 INFO L495 AbstractCegarLoop]: Abstraction has 11103 states and 33907 transitions. [2022-11-16 20:24:16,397 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 55 states have (on average 1.3454545454545455) internal successors, (74), 55 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:24:16,397 INFO L276 IsEmpty]: Start isEmpty. Operand 11103 states and 33907 transitions. [2022-11-16 20:24:16,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-11-16 20:24:16,402 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:24:16,402 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:24:16,407 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Forceful destruction successful, exit code 0 [2022-11-16 20:24:16,603 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable60 [2022-11-16 20:24:16,603 INFO L420 AbstractCegarLoop]: === Iteration 62 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:24:16,603 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:24:16,603 INFO L85 PathProgramCache]: Analyzing trace with hash -1232316712, now seen corresponding path program 59 times [2022-11-16 20:24:16,603 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:24:16,603 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1080329879] [2022-11-16 20:24:16,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:24:16,604 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:24:16,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:24:17,677 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 10 proven. 53 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:24:17,677 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:24:17,678 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1080329879] [2022-11-16 20:24:17,678 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1080329879] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:24:17,678 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [536666639] [2022-11-16 20:24:17,678 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 20:24:17,678 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:24:17,678 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:24:17,679 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:24:17,681 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Waiting until timeout for monitored process [2022-11-16 20:24:18,641 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-16 20:24:18,641 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:24:18,644 INFO L263 TraceCheckSpWp]: Trace formula consists of 304 conjuncts, 84 conjunts are in the unsatisfiable core [2022-11-16 20:24:18,646 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:24:19,573 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 20:24:19,573 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 54 treesize of output 50 [2022-11-16 20:24:20,244 INFO L321 Elim1Store]: treesize reduction 52, result has 5.5 percent of original size [2022-11-16 20:24:20,245 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 6 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 52 treesize of output 19 [2022-11-16 20:24:20,255 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 21 proven. 39 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-16 20:24:20,255 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:24:23,335 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-16 20:24:23,335 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 83 treesize of output 93 [2022-11-16 20:24:23,344 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 7 [2022-11-16 20:24:24,544 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 4 proven. 56 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-16 20:24:24,545 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [536666639] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:24:24,545 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1532853127] [2022-11-16 20:24:24,545 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:24:24,545 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:24:24,545 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19, 19] total 56 [2022-11-16 20:24:24,546 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [839600826] [2022-11-16 20:24:24,546 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:24:24,546 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2022-11-16 20:24:24,546 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:24:24,546 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2022-11-16 20:24:24,547 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=402, Invalid=2903, Unknown=1, NotChecked=0, Total=3306 [2022-11-16 20:24:24,547 INFO L87 Difference]: Start difference. First operand 11103 states and 33907 transitions. Second operand has 58 states, 57 states have (on average 1.3333333333333333) internal successors, (76), 57 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:24:34,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:24:34,612 INFO L93 Difference]: Finished difference Result 11250 states and 34232 transitions. [2022-11-16 20:24:34,612 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2022-11-16 20:24:34,613 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 57 states have (on average 1.3333333333333333) internal successors, (76), 57 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2022-11-16 20:24:34,613 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:24:34,634 INFO L225 Difference]: With dead ends: 11250 [2022-11-16 20:24:34,634 INFO L226 Difference]: Without dead ends: 11243 [2022-11-16 20:24:34,635 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 35 SyntacticMatches, 11 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 5 DeprecatedPredicates, 2376 ImplicationChecksByTransitivity, 14.6s TimeCoverageRelationStatistics Valid=1375, Invalid=8523, Unknown=2, NotChecked=0, Total=9900 [2022-11-16 20:24:34,635 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 186 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 655 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 186 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 2000 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 655 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1313 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-16 20:24:34,635 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [186 Valid, 0 Invalid, 2000 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 655 Invalid, 0 Unknown, 1313 Unchecked, 0.5s Time] [2022-11-16 20:24:34,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11243 states. [2022-11-16 20:24:34,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11243 to 11126. [2022-11-16 20:24:34,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11126 states, 11125 states have (on average 3.052674157303371) internal successors, (33961), 11125 states have internal predecessors, (33961), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:24:34,844 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11126 states to 11126 states and 33961 transitions. [2022-11-16 20:24:34,844 INFO L78 Accepts]: Start accepts. Automaton has 11126 states and 33961 transitions. Word has length 30 [2022-11-16 20:24:34,844 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:24:34,844 INFO L495 AbstractCegarLoop]: Abstraction has 11126 states and 33961 transitions. [2022-11-16 20:24:34,845 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 57 states have (on average 1.3333333333333333) internal successors, (76), 57 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:24:34,845 INFO L276 IsEmpty]: Start isEmpty. Operand 11126 states and 33961 transitions. [2022-11-16 20:24:34,849 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-11-16 20:24:34,849 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:24:34,849 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:24:34,854 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Forceful destruction successful, exit code 0 [2022-11-16 20:24:35,049 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61,59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:24:35,050 INFO L420 AbstractCegarLoop]: === Iteration 63 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:24:35,050 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:24:35,050 INFO L85 PathProgramCache]: Analyzing trace with hash 299543552, now seen corresponding path program 60 times [2022-11-16 20:24:35,050 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:24:35,050 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2011566441] [2022-11-16 20:24:35,050 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:24:35,051 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:24:35,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:24:36,037 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 10 proven. 53 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:24:36,037 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:24:36,037 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2011566441] [2022-11-16 20:24:36,037 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2011566441] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:24:36,038 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1936860306] [2022-11-16 20:24:36,038 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 20:24:36,038 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:24:36,038 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:24:36,039 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:24:36,043 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Waiting until timeout for monitored process [2022-11-16 20:24:36,267 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 20:24:36,267 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:24:36,269 INFO L263 TraceCheckSpWp]: Trace formula consists of 314 conjuncts, 57 conjunts are in the unsatisfiable core [2022-11-16 20:24:36,274 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:24:37,011 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 20:24:37,012 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 21 [2022-11-16 20:24:37,395 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 7 [2022-11-16 20:24:37,401 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 63 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:24:37,401 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:24:37,734 WARN L833 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_2645 (Array Int Int))) (= 5 (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~#t2~0#1.base| v_ArrVal_2645) c_~queue~0.base) (+ c_~queue~0.offset (* c_~front~0 4) 20)))) is different from false [2022-11-16 20:24:37,746 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-16 20:24:37,747 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 44 treesize of output 41 [2022-11-16 20:24:37,756 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 3 [2022-11-16 20:24:38,965 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 63 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:24:38,965 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1936860306] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:24:38,965 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1492024333] [2022-11-16 20:24:38,966 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:24:38,967 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:24:38,967 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 61 [2022-11-16 20:24:38,967 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2032627251] [2022-11-16 20:24:38,967 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:24:38,968 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2022-11-16 20:24:38,968 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:24:38,968 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2022-11-16 20:24:38,968 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=401, Invalid=3384, Unknown=1, NotChecked=120, Total=3906 [2022-11-16 20:24:38,969 INFO L87 Difference]: Start difference. First operand 11126 states and 33961 transitions. Second operand has 63 states, 62 states have (on average 1.3548387096774193) internal successors, (84), 62 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:24:50,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:24:50,901 INFO L93 Difference]: Finished difference Result 15058 states and 43676 transitions. [2022-11-16 20:24:50,901 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 108 states. [2022-11-16 20:24:50,902 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 62 states have (on average 1.3548387096774193) internal successors, (84), 62 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2022-11-16 20:24:50,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:24:50,932 INFO L225 Difference]: With dead ends: 15058 [2022-11-16 20:24:50,932 INFO L226 Difference]: Without dead ends: 15046 [2022-11-16 20:24:50,934 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 26 SyntacticMatches, 1 SemanticMatches, 149 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 4963 ImplicationChecksByTransitivity, 10.8s TimeCoverageRelationStatistics Valid=3377, Invalid=18976, Unknown=1, NotChecked=296, Total=22650 [2022-11-16 20:24:50,934 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 952 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 4553 mSolverCounterSat, 210 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 952 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 5101 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 210 IncrementalHoareTripleChecker+Valid, 4553 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 338 IncrementalHoareTripleChecker+Unchecked, 3.5s IncrementalHoareTripleChecker+Time [2022-11-16 20:24:50,934 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [952 Valid, 0 Invalid, 5101 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [210 Valid, 4553 Invalid, 0 Unknown, 338 Unchecked, 3.5s Time] [2022-11-16 20:24:50,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15046 states. [2022-11-16 20:24:51,258 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15046 to 11180. [2022-11-16 20:24:51,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11180 states, 11179 states have (on average 3.052866982735486) internal successors, (34128), 11179 states have internal predecessors, (34128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:24:51,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11180 states to 11180 states and 34128 transitions. [2022-11-16 20:24:51,290 INFO L78 Accepts]: Start accepts. Automaton has 11180 states and 34128 transitions. Word has length 30 [2022-11-16 20:24:51,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:24:51,291 INFO L495 AbstractCegarLoop]: Abstraction has 11180 states and 34128 transitions. [2022-11-16 20:24:51,291 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 63 states, 62 states have (on average 1.3548387096774193) internal successors, (84), 62 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:24:51,291 INFO L276 IsEmpty]: Start isEmpty. Operand 11180 states and 34128 transitions. [2022-11-16 20:24:51,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-11-16 20:24:51,296 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:24:51,296 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:24:51,301 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Forceful destruction successful, exit code 0 [2022-11-16 20:24:51,498 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable62,60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:24:51,498 INFO L420 AbstractCegarLoop]: === Iteration 64 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:24:51,499 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:24:51,499 INFO L85 PathProgramCache]: Analyzing trace with hash -513497344, now seen corresponding path program 61 times [2022-11-16 20:24:51,499 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:24:51,499 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [778850786] [2022-11-16 20:24:51,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:24:51,500 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:24:51,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:24:52,399 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 10 proven. 53 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:24:52,399 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:24:52,399 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [778850786] [2022-11-16 20:24:52,399 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [778850786] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:24:52,399 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1153792604] [2022-11-16 20:24:52,399 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-16 20:24:52,400 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:24:52,400 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:24:52,402 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:24:52,403 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Waiting until timeout for monitored process [2022-11-16 20:24:52,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:24:52,637 INFO L263 TraceCheckSpWp]: Trace formula consists of 314 conjuncts, 50 conjunts are in the unsatisfiable core [2022-11-16 20:24:52,638 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:24:53,388 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 20:24:53,389 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 20 [2022-11-16 20:24:53,836 INFO L321 Elim1Store]: treesize reduction 9, result has 25.0 percent of original size [2022-11-16 20:24:53,837 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 10 [2022-11-16 20:24:53,847 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 10 proven. 53 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:24:53,847 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:24:53,918 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-16 20:24:53,918 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 27 [2022-11-16 20:24:55,281 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 10 proven. 53 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:24:55,281 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1153792604] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:24:55,281 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1953770647] [2022-11-16 20:24:55,281 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:24:55,283 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:24:55,283 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 54 [2022-11-16 20:24:55,283 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [473128429] [2022-11-16 20:24:55,283 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:24:55,284 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2022-11-16 20:24:55,284 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:24:55,284 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2022-11-16 20:24:55,285 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=417, Invalid=2663, Unknown=0, NotChecked=0, Total=3080 [2022-11-16 20:24:55,285 INFO L87 Difference]: Start difference. First operand 11180 states and 34128 transitions. Second operand has 56 states, 55 states have (on average 1.309090909090909) internal successors, (72), 55 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:24:57,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:24:57,755 INFO L93 Difference]: Finished difference Result 11486 states and 34809 transitions. [2022-11-16 20:24:57,755 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-11-16 20:24:57,756 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 55 states have (on average 1.309090909090909) internal successors, (72), 55 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2022-11-16 20:24:57,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:24:57,779 INFO L225 Difference]: With dead ends: 11486 [2022-11-16 20:24:57,779 INFO L226 Difference]: Without dead ends: 11481 [2022-11-16 20:24:57,779 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 26 SyntacticMatches, 1 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1673 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=922, Invalid=5720, Unknown=0, NotChecked=0, Total=6642 [2022-11-16 20:24:57,780 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 128 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 1159 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 128 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 1556 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 1159 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 351 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-16 20:24:57,780 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [128 Valid, 0 Invalid, 1556 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 1159 Invalid, 0 Unknown, 351 Unchecked, 0.9s Time] [2022-11-16 20:24:57,795 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11481 states. [2022-11-16 20:24:57,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11481 to 11192. [2022-11-16 20:24:57,965 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11192 states, 11191 states have (on average 3.051738003753016) internal successors, (34152), 11191 states have internal predecessors, (34152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:24:57,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11192 states to 11192 states and 34152 transitions. [2022-11-16 20:24:57,991 INFO L78 Accepts]: Start accepts. Automaton has 11192 states and 34152 transitions. Word has length 30 [2022-11-16 20:24:57,992 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:24:57,992 INFO L495 AbstractCegarLoop]: Abstraction has 11192 states and 34152 transitions. [2022-11-16 20:24:57,992 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 55 states have (on average 1.309090909090909) internal successors, (72), 55 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:24:57,992 INFO L276 IsEmpty]: Start isEmpty. Operand 11192 states and 34152 transitions. [2022-11-16 20:24:57,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-11-16 20:24:57,998 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:24:57,998 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:24:58,003 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Forceful destruction successful, exit code 0 [2022-11-16 20:24:58,198 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable63,61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:24:58,198 INFO L420 AbstractCegarLoop]: === Iteration 65 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:24:58,199 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:24:58,199 INFO L85 PathProgramCache]: Analyzing trace with hash 2061342308, now seen corresponding path program 62 times [2022-11-16 20:24:58,199 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:24:58,199 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [294173086] [2022-11-16 20:24:58,199 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:24:58,199 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:24:58,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:24:59,093 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 10 proven. 53 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:24:59,093 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:24:59,093 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [294173086] [2022-11-16 20:24:59,093 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [294173086] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:24:59,093 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1483680390] [2022-11-16 20:24:59,094 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 20:24:59,094 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:24:59,094 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:24:59,095 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:24:59,098 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Waiting until timeout for monitored process [2022-11-16 20:24:59,804 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-16 20:24:59,805 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:24:59,807 INFO L263 TraceCheckSpWp]: Trace formula consists of 314 conjuncts, 45 conjunts are in the unsatisfiable core [2022-11-16 20:24:59,809 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:25:00,362 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 20:25:00,365 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 20 [2022-11-16 20:25:00,899 INFO L321 Elim1Store]: treesize reduction 9, result has 25.0 percent of original size [2022-11-16 20:25:00,899 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 10 [2022-11-16 20:25:00,905 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 15 proven. 38 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-16 20:25:00,906 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:25:02,630 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-16 20:25:02,631 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 38 [2022-11-16 20:25:02,638 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 7 [2022-11-16 20:25:03,578 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 15 proven. 38 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-16 20:25:03,578 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1483680390] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:25:03,578 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [228622635] [2022-11-16 20:25:03,579 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:25:03,579 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:25:03,579 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 17, 17] total 53 [2022-11-16 20:25:03,579 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2003921331] [2022-11-16 20:25:03,579 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:25:03,580 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2022-11-16 20:25:03,580 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:25:03,580 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2022-11-16 20:25:03,580 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=402, Invalid=2567, Unknown=1, NotChecked=0, Total=2970 [2022-11-16 20:25:03,580 INFO L87 Difference]: Start difference. First operand 11192 states and 34152 transitions. Second operand has 55 states, 54 states have (on average 1.4444444444444444) internal successors, (78), 54 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:25:11,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:25:11,686 INFO L93 Difference]: Finished difference Result 13451 states and 38922 transitions. [2022-11-16 20:25:11,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2022-11-16 20:25:11,687 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 54 states have (on average 1.4444444444444444) internal successors, (78), 54 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2022-11-16 20:25:11,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:25:11,717 INFO L225 Difference]: With dead ends: 13451 [2022-11-16 20:25:11,717 INFO L226 Difference]: Without dead ends: 13424 [2022-11-16 20:25:11,718 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 34 SyntacticMatches, 3 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2414 ImplicationChecksByTransitivity, 10.9s TimeCoverageRelationStatistics Valid=1401, Invalid=8898, Unknown=3, NotChecked=0, Total=10302 [2022-11-16 20:25:11,718 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 104 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 345 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 104 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 963 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 345 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 591 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-16 20:25:11,718 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [104 Valid, 0 Invalid, 963 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 345 Invalid, 0 Unknown, 591 Unchecked, 0.3s Time] [2022-11-16 20:25:11,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13424 states. [2022-11-16 20:25:11,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13424 to 11834. [2022-11-16 20:25:11,992 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11834 states, 11833 states have (on average 3.0112397532324855) internal successors, (35632), 11833 states have internal predecessors, (35632), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:25:12,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11834 states to 11834 states and 35632 transitions. [2022-11-16 20:25:12,020 INFO L78 Accepts]: Start accepts. Automaton has 11834 states and 35632 transitions. Word has length 30 [2022-11-16 20:25:12,021 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:25:12,021 INFO L495 AbstractCegarLoop]: Abstraction has 11834 states and 35632 transitions. [2022-11-16 20:25:12,021 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 54 states have (on average 1.4444444444444444) internal successors, (78), 54 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:25:12,021 INFO L276 IsEmpty]: Start isEmpty. Operand 11834 states and 35632 transitions. [2022-11-16 20:25:12,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-11-16 20:25:12,027 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:25:12,027 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:25:12,032 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Forceful destruction successful, exit code 0 [2022-11-16 20:25:12,227 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable64 [2022-11-16 20:25:12,228 INFO L420 AbstractCegarLoop]: === Iteration 66 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:25:12,228 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:25:12,229 INFO L85 PathProgramCache]: Analyzing trace with hash -1734923648, now seen corresponding path program 63 times [2022-11-16 20:25:12,229 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:25:12,229 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [751282627] [2022-11-16 20:25:12,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:25:12,229 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:25:12,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:25:13,127 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 6 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:25:13,127 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:25:13,127 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [751282627] [2022-11-16 20:25:13,127 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [751282627] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:25:13,127 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1885647370] [2022-11-16 20:25:13,127 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 20:25:13,128 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:25:13,128 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:25:13,131 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:25:13,133 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Waiting until timeout for monitored process [2022-11-16 20:25:13,376 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 20:25:13,377 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:25:13,379 INFO L263 TraceCheckSpWp]: Trace formula consists of 314 conjuncts, 50 conjunts are in the unsatisfiable core [2022-11-16 20:25:13,380 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:25:14,210 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 20:25:14,211 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 20 [2022-11-16 20:25:14,675 INFO L321 Elim1Store]: treesize reduction 9, result has 25.0 percent of original size [2022-11-16 20:25:14,675 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 10 [2022-11-16 20:25:14,681 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 10 proven. 53 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:25:14,681 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:25:14,715 WARN L833 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_2798 (Array Int Int))) (= 5 (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~#t2~0#1.base| v_ArrVal_2798) c_~queue~0.base) (+ c_~queue~0.offset (* c_~front~0 4) 20)))) is different from false [2022-11-16 20:25:14,726 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-16 20:25:14,727 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 44 treesize of output 41 [2022-11-16 20:25:14,732 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 3 [2022-11-16 20:25:16,118 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 10 proven. 53 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:25:16,118 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1885647370] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:25:16,118 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1359125243] [2022-11-16 20:25:16,119 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:25:16,120 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:25:16,120 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 55 [2022-11-16 20:25:16,120 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2099806451] [2022-11-16 20:25:16,120 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:25:16,121 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2022-11-16 20:25:16,121 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:25:16,121 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2022-11-16 20:25:16,122 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=402, Invalid=2681, Unknown=1, NotChecked=108, Total=3192 [2022-11-16 20:25:16,122 INFO L87 Difference]: Start difference. First operand 11834 states and 35632 transitions. Second operand has 57 states, 56 states have (on average 1.3035714285714286) internal successors, (73), 56 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:25:19,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:25:19,706 INFO L93 Difference]: Finished difference Result 12175 states and 36394 transitions. [2022-11-16 20:25:19,707 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2022-11-16 20:25:19,707 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 56 states have (on average 1.3035714285714286) internal successors, (73), 56 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2022-11-16 20:25:19,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:25:19,730 INFO L225 Difference]: With dead ends: 12175 [2022-11-16 20:25:19,730 INFO L226 Difference]: Without dead ends: 12169 [2022-11-16 20:25:19,730 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 26 SyntacticMatches, 1 SemanticMatches, 90 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 1977 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=1166, Invalid=7027, Unknown=1, NotChecked=178, Total=8372 [2022-11-16 20:25:19,731 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 138 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 1239 mSolverCounterSat, 48 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 138 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 1877 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 1239 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 590 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-11-16 20:25:19,731 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [138 Valid, 0 Invalid, 1877 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 1239 Invalid, 0 Unknown, 590 Unchecked, 1.0s Time] [2022-11-16 20:25:19,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12169 states. [2022-11-16 20:25:19,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12169 to 11826. [2022-11-16 20:25:19,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11826 states, 11825 states have (on average 3.012093023255814) internal successors, (35618), 11825 states have internal predecessors, (35618), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:25:19,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11826 states to 11826 states and 35618 transitions. [2022-11-16 20:25:19,940 INFO L78 Accepts]: Start accepts. Automaton has 11826 states and 35618 transitions. Word has length 30 [2022-11-16 20:25:19,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:25:19,940 INFO L495 AbstractCegarLoop]: Abstraction has 11826 states and 35618 transitions. [2022-11-16 20:25:19,940 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 56 states have (on average 1.3035714285714286) internal successors, (73), 56 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:25:19,940 INFO L276 IsEmpty]: Start isEmpty. Operand 11826 states and 35618 transitions. [2022-11-16 20:25:19,945 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-11-16 20:25:19,945 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:25:19,945 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:25:19,951 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Forceful destruction successful, exit code 0 [2022-11-16 20:25:20,146 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable65 [2022-11-16 20:25:20,146 INFO L420 AbstractCegarLoop]: === Iteration 67 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:25:20,147 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:25:20,147 INFO L85 PathProgramCache]: Analyzing trace with hash 92652636, now seen corresponding path program 64 times [2022-11-16 20:25:20,147 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:25:20,147 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1383688325] [2022-11-16 20:25:20,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:25:20,148 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:25:20,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:25:21,032 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 10 proven. 53 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:25:21,032 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:25:21,032 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1383688325] [2022-11-16 20:25:21,032 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1383688325] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:25:21,033 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1417888505] [2022-11-16 20:25:21,033 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-16 20:25:21,033 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:25:21,033 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:25:21,034 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:25:21,036 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Waiting until timeout for monitored process [2022-11-16 20:25:21,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:25:21,279 INFO L263 TraceCheckSpWp]: Trace formula consists of 314 conjuncts, 57 conjunts are in the unsatisfiable core [2022-11-16 20:25:21,281 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:25:22,026 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 20:25:22,027 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 21 [2022-11-16 20:25:22,362 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 7 [2022-11-16 20:25:22,367 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 63 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:25:22,367 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:25:22,401 WARN L833 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_2849 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~#t2~0#1.base| v_ArrVal_2849) c_~queue~0.base) (+ c_~queue~0.offset (* c_~front~0 4) 20)) 5)) is different from false [2022-11-16 20:25:22,414 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-16 20:25:22,414 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 44 treesize of output 41 [2022-11-16 20:25:22,419 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 3 [2022-11-16 20:25:23,368 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 63 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:25:23,368 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1417888505] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:25:23,368 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1747890054] [2022-11-16 20:25:23,368 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:25:23,368 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:25:23,369 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 55 [2022-11-16 20:25:23,369 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [630232906] [2022-11-16 20:25:23,369 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:25:23,369 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2022-11-16 20:25:23,369 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:25:23,370 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2022-11-16 20:25:23,370 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=399, Invalid=2684, Unknown=1, NotChecked=108, Total=3192 [2022-11-16 20:25:23,370 INFO L87 Difference]: Start difference. First operand 11826 states and 35618 transitions. Second operand has 57 states, 56 states have (on average 1.3035714285714286) internal successors, (73), 56 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:25:31,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:25:31,883 INFO L93 Difference]: Finished difference Result 14493 states and 42829 transitions. [2022-11-16 20:25:31,884 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 109 states. [2022-11-16 20:25:31,884 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 56 states have (on average 1.3035714285714286) internal successors, (73), 56 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2022-11-16 20:25:31,884 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:25:31,916 INFO L225 Difference]: With dead ends: 14493 [2022-11-16 20:25:31,916 INFO L226 Difference]: Without dead ends: 14486 [2022-11-16 20:25:31,917 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 140 ConstructedPredicates, 1 IntricatePredicates, 7 DeprecatedPredicates, 5409 ImplicationChecksByTransitivity, 8.1s TimeCoverageRelationStatistics Valid=3200, Invalid=16543, Unknown=1, NotChecked=278, Total=20022 [2022-11-16 20:25:31,918 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 366 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 2588 mSolverCounterSat, 156 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 366 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 3126 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 156 IncrementalHoareTripleChecker+Valid, 2588 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 382 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2022-11-16 20:25:31,918 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [366 Valid, 0 Invalid, 3126 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [156 Valid, 2588 Invalid, 0 Unknown, 382 Unchecked, 2.2s Time] [2022-11-16 20:25:31,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14486 states. [2022-11-16 20:25:32,146 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14486 to 11798. [2022-11-16 20:25:32,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11798 states, 11797 states have (on average 3.0141561413918794) internal successors, (35558), 11797 states have internal predecessors, (35558), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:25:32,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11798 states to 11798 states and 35558 transitions. [2022-11-16 20:25:32,185 INFO L78 Accepts]: Start accepts. Automaton has 11798 states and 35558 transitions. Word has length 30 [2022-11-16 20:25:32,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:25:32,185 INFO L495 AbstractCegarLoop]: Abstraction has 11798 states and 35558 transitions. [2022-11-16 20:25:32,185 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 56 states have (on average 1.3035714285714286) internal successors, (73), 56 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:25:32,185 INFO L276 IsEmpty]: Start isEmpty. Operand 11798 states and 35558 transitions. [2022-11-16 20:25:32,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-11-16 20:25:32,191 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:25:32,191 INFO L195 NwaCegarLoop]: trace histogram [10, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:25:32,197 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Forceful destruction successful, exit code 0 [2022-11-16 20:25:32,391 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable66 [2022-11-16 20:25:32,392 INFO L420 AbstractCegarLoop]: === Iteration 68 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:25:32,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:25:32,392 INFO L85 PathProgramCache]: Analyzing trace with hash -633510088, now seen corresponding path program 65 times [2022-11-16 20:25:32,392 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:25:32,392 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [729765102] [2022-11-16 20:25:32,392 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:25:32,392 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:25:32,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:25:34,662 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:25:34,662 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:25:34,663 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [729765102] [2022-11-16 20:25:34,663 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [729765102] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:25:34,663 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [839934137] [2022-11-16 20:25:34,663 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 20:25:34,663 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:25:34,663 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:25:34,664 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:25:34,670 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Waiting until timeout for monitored process [2022-11-16 20:25:35,153 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-16 20:25:35,154 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:25:35,156 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 30 conjunts are in the unsatisfiable core [2022-11-16 20:25:35,158 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:25:35,463 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 20:25:35,463 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 20 [2022-11-16 20:25:35,747 INFO L321 Elim1Store]: treesize reduction 9, result has 25.0 percent of original size [2022-11-16 20:25:35,747 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 10 [2022-11-16 20:25:35,756 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 6 proven. 14 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-11-16 20:25:35,757 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:25:39,277 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-16 20:25:39,278 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 38 [2022-11-16 20:25:39,284 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 7 [2022-11-16 20:25:39,914 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 3 proven. 17 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-11-16 20:25:39,914 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [839934137] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:25:39,915 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [217075742] [2022-11-16 20:25:39,915 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:25:39,915 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:25:39,915 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 11, 11] total 41 [2022-11-16 20:25:39,916 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2031744536] [2022-11-16 20:25:39,916 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:25:39,916 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2022-11-16 20:25:39,916 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:25:39,916 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2022-11-16 20:25:39,917 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=326, Invalid=1478, Unknown=2, NotChecked=0, Total=1806 [2022-11-16 20:25:39,917 INFO L87 Difference]: Start difference. First operand 11798 states and 35558 transitions. Second operand has 43 states, 42 states have (on average 1.4285714285714286) internal successors, (60), 42 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:25:48,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:25:48,271 INFO L93 Difference]: Finished difference Result 12883 states and 38102 transitions. [2022-11-16 20:25:48,271 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2022-11-16 20:25:48,272 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 42 states have (on average 1.4285714285714286) internal successors, (60), 42 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2022-11-16 20:25:48,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:25:48,309 INFO L225 Difference]: With dead ends: 12883 [2022-11-16 20:25:48,309 INFO L226 Difference]: Without dead ends: 12864 [2022-11-16 20:25:48,310 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 46 SyntacticMatches, 2 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2101 ImplicationChecksByTransitivity, 12.5s TimeCoverageRelationStatistics Valid=1498, Invalid=7618, Unknown=4, NotChecked=0, Total=9120 [2022-11-16 20:25:48,310 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 341 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 387 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 341 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 1000 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 387 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 564 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-16 20:25:48,311 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [341 Valid, 0 Invalid, 1000 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 387 Invalid, 0 Unknown, 564 Unchecked, 0.4s Time] [2022-11-16 20:25:48,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12864 states. [2022-11-16 20:25:48,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12864 to 11846. [2022-11-16 20:25:48,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11846 states, 11845 states have (on average 3.0140987758547912) internal successors, (35702), 11845 states have internal predecessors, (35702), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:25:48,679 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11846 states to 11846 states and 35702 transitions. [2022-11-16 20:25:48,679 INFO L78 Accepts]: Start accepts. Automaton has 11846 states and 35702 transitions. Word has length 30 [2022-11-16 20:25:48,679 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:25:48,679 INFO L495 AbstractCegarLoop]: Abstraction has 11846 states and 35702 transitions. [2022-11-16 20:25:48,679 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 42 states have (on average 1.4285714285714286) internal successors, (60), 42 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:25:48,679 INFO L276 IsEmpty]: Start isEmpty. Operand 11846 states and 35702 transitions. [2022-11-16 20:25:48,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-11-16 20:25:48,687 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:25:48,687 INFO L195 NwaCegarLoop]: trace histogram [10, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:25:48,694 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Forceful destruction successful, exit code 0 [2022-11-16 20:25:48,887 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable67 [2022-11-16 20:25:48,888 INFO L420 AbstractCegarLoop]: === Iteration 69 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:25:48,889 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:25:48,889 INFO L85 PathProgramCache]: Analyzing trace with hash 1141378104, now seen corresponding path program 66 times [2022-11-16 20:25:48,889 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:25:48,889 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2131553856] [2022-11-16 20:25:48,889 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:25:48,890 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:25:48,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:25:51,789 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:25:51,789 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:25:51,790 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2131553856] [2022-11-16 20:25:51,790 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2131553856] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:25:51,790 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2003669209] [2022-11-16 20:25:51,790 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 20:25:51,790 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:25:51,790 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:25:51,801 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:25:51,815 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Waiting until timeout for monitored process [2022-11-16 20:25:52,049 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 20:25:52,049 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:25:52,051 INFO L263 TraceCheckSpWp]: Trace formula consists of 312 conjuncts, 53 conjunts are in the unsatisfiable core [2022-11-16 20:25:52,053 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:25:52,930 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 20:25:52,930 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 21 [2022-11-16 20:25:53,057 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 7 [2022-11-16 20:25:53,119 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 74 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-16 20:25:53,119 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:25:53,154 WARN L833 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_2983 (Array Int Int))) (= 5 (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~#t2~0#1.base| v_ArrVal_2983) c_~queue~0.base) (+ c_~queue~0.offset (* c_~front~0 4) 12)))) is different from false [2022-11-16 20:25:53,165 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-16 20:25:53,165 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 44 treesize of output 41 [2022-11-16 20:25:53,177 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 3 [2022-11-16 20:25:53,575 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-11-16 20:25:53,576 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2003669209] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:25:53,576 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [435291427] [2022-11-16 20:25:53,576 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:25:53,576 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:25:53,576 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20, 11] total 44 [2022-11-16 20:25:53,577 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2000549564] [2022-11-16 20:25:53,577 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:25:53,577 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-11-16 20:25:53,577 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:25:53,577 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-11-16 20:25:53,578 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=160, Invalid=1823, Unknown=1, NotChecked=86, Total=2070 [2022-11-16 20:25:53,578 INFO L87 Difference]: Start difference. First operand 11846 states and 35702 transitions. Second operand has 46 states, 45 states have (on average 1.3555555555555556) internal successors, (61), 45 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:25:57,427 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:25:57,427 INFO L93 Difference]: Finished difference Result 14924 states and 43355 transitions. [2022-11-16 20:25:57,427 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-11-16 20:25:57,428 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 45 states have (on average 1.3555555555555556) internal successors, (61), 45 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2022-11-16 20:25:57,428 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:25:57,456 INFO L225 Difference]: With dead ends: 14924 [2022-11-16 20:25:57,456 INFO L226 Difference]: Without dead ends: 14895 [2022-11-16 20:25:57,456 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 69 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 614 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=507, Invalid=4326, Unknown=1, NotChecked=136, Total=4970 [2022-11-16 20:25:57,457 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 283 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 1666 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 283 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 1778 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 1666 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 76 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2022-11-16 20:25:57,457 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [283 Valid, 0 Invalid, 1778 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 1666 Invalid, 0 Unknown, 76 Unchecked, 1.3s Time] [2022-11-16 20:25:57,478 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14895 states. [2022-11-16 20:25:57,705 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14895 to 11769. [2022-11-16 20:25:57,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11769 states, 11768 states have (on average 3.014615907545887) internal successors, (35476), 11768 states have internal predecessors, (35476), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:25:57,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11769 states to 11769 states and 35476 transitions. [2022-11-16 20:25:57,753 INFO L78 Accepts]: Start accepts. Automaton has 11769 states and 35476 transitions. Word has length 30 [2022-11-16 20:25:57,754 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:25:57,754 INFO L495 AbstractCegarLoop]: Abstraction has 11769 states and 35476 transitions. [2022-11-16 20:25:57,754 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 45 states have (on average 1.3555555555555556) internal successors, (61), 45 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:25:57,754 INFO L276 IsEmpty]: Start isEmpty. Operand 11769 states and 35476 transitions. [2022-11-16 20:25:57,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-11-16 20:25:57,761 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:25:57,761 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:25:57,768 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Forceful destruction successful, exit code 0 [2022-11-16 20:25:57,961 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable68 [2022-11-16 20:25:57,962 INFO L420 AbstractCegarLoop]: === Iteration 70 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:25:57,962 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:25:57,962 INFO L85 PathProgramCache]: Analyzing trace with hash -1609121902, now seen corresponding path program 67 times [2022-11-16 20:25:57,962 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:25:57,962 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1393150646] [2022-11-16 20:25:57,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:25:57,962 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:25:57,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:25:58,141 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 33 proven. 15 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-11-16 20:25:58,141 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:25:58,141 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1393150646] [2022-11-16 20:25:58,142 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1393150646] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:25:58,142 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [834013292] [2022-11-16 20:25:58,142 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-16 20:25:58,142 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:25:58,142 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:25:58,143 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:25:58,147 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Waiting until timeout for monitored process [2022-11-16 20:25:58,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:25:58,392 INFO L263 TraceCheckSpWp]: Trace formula consists of 324 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-16 20:25:58,393 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:25:58,761 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 33 proven. 27 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-16 20:25:58,762 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:25:59,305 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 27 proven. 33 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-16 20:25:59,305 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [834013292] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:25:59,305 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [434773126] [2022-11-16 20:25:59,306 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:25:59,307 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:25:59,307 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 16, 16] total 38 [2022-11-16 20:25:59,307 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [404794755] [2022-11-16 20:25:59,307 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:25:59,308 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-11-16 20:25:59,308 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:25:59,308 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-11-16 20:25:59,308 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=405, Invalid=1077, Unknown=0, NotChecked=0, Total=1482 [2022-11-16 20:25:59,309 INFO L87 Difference]: Start difference. First operand 11769 states and 35476 transitions. Second operand has 39 states, 39 states have (on average 1.8974358974358974) internal successors, (74), 38 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:26:00,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:26:00,480 INFO L93 Difference]: Finished difference Result 8066 states and 19083 transitions. [2022-11-16 20:26:00,480 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2022-11-16 20:26:00,480 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.8974358974358974) internal successors, (74), 38 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 31 [2022-11-16 20:26:00,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:26:00,487 INFO L225 Difference]: With dead ends: 8066 [2022-11-16 20:26:00,487 INFO L226 Difference]: Without dead ends: 3451 [2022-11-16 20:26:00,488 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1295 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1295, Invalid=3127, Unknown=0, NotChecked=0, Total=4422 [2022-11-16 20:26:00,489 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 384 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 651 mSolverCounterSat, 68 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 384 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 719 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 68 IncrementalHoareTripleChecker+Valid, 651 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-16 20:26:00,489 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [384 Valid, 0 Invalid, 719 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [68 Valid, 651 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-16 20:26:00,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3451 states. [2022-11-16 20:26:00,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3451 to 2434. [2022-11-16 20:26:00,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2434 states, 2433 states have (on average 3.1454993834771887) internal successors, (7653), 2433 states have internal predecessors, (7653), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:26:00,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2434 states to 2434 states and 7653 transitions. [2022-11-16 20:26:00,548 INFO L78 Accepts]: Start accepts. Automaton has 2434 states and 7653 transitions. Word has length 31 [2022-11-16 20:26:00,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:26:00,548 INFO L495 AbstractCegarLoop]: Abstraction has 2434 states and 7653 transitions. [2022-11-16 20:26:00,548 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 1.8974358974358974) internal successors, (74), 38 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:26:00,549 INFO L276 IsEmpty]: Start isEmpty. Operand 2434 states and 7653 transitions. [2022-11-16 20:26:00,551 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-11-16 20:26:00,551 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:26:00,552 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:26:00,564 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Forceful destruction successful, exit code 0 [2022-11-16 20:26:00,758 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable69,67 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:26:00,758 INFO L420 AbstractCegarLoop]: === Iteration 71 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:26:00,759 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:26:00,759 INFO L85 PathProgramCache]: Analyzing trace with hash 458957503, now seen corresponding path program 68 times [2022-11-16 20:26:00,759 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:26:00,759 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [7199683] [2022-11-16 20:26:00,759 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:26:00,759 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:26:00,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:26:01,934 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:26:01,934 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:26:01,934 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [7199683] [2022-11-16 20:26:01,934 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [7199683] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:26:01,934 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [594015385] [2022-11-16 20:26:01,934 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 20:26:01,934 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:26:01,934 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:26:01,935 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:26:01,938 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Waiting until timeout for monitored process [2022-11-16 20:26:02,634 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-16 20:26:02,635 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:26:02,637 INFO L263 TraceCheckSpWp]: Trace formula consists of 314 conjuncts, 34 conjunts are in the unsatisfiable core [2022-11-16 20:26:02,638 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:26:03,097 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 20:26:03,098 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 20 [2022-11-16 20:26:03,715 INFO L321 Elim1Store]: treesize reduction 9, result has 25.0 percent of original size [2022-11-16 20:26:03,715 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 10 [2022-11-16 20:26:03,721 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 15 proven. 27 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-11-16 20:26:03,721 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:26:06,528 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-16 20:26:06,528 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 38 [2022-11-16 20:26:06,534 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 7 [2022-11-16 20:26:07,282 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 10 proven. 32 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-11-16 20:26:07,282 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [594015385] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:26:07,283 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [938702216] [2022-11-16 20:26:07,283 FATAL L? ?]: Ignoring exception! java.lang.UnsupportedOperationException: Cannot create path program transition for IcfgForkThreadOtherTransition at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:295) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.createPathProgramTransition(PathProgram.java:270) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram$PathProgramConstructor.(PathProgram.java:235) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.PathProgram.constructPathProgram(PathProgram.java:112) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:91) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:225) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:26:07,284 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:26:07,284 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 15, 15] total 50 [2022-11-16 20:26:07,285 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [727679384] [2022-11-16 20:26:07,285 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:26:07,285 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2022-11-16 20:26:07,285 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:26:07,286 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2022-11-16 20:26:07,286 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=397, Invalid=2254, Unknown=1, NotChecked=0, Total=2652 [2022-11-16 20:26:07,286 INFO L87 Difference]: Start difference. First operand 2434 states and 7653 transitions. Second operand has 52 states, 51 states have (on average 1.4705882352941178) internal successors, (75), 51 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:26:15,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:26:15,747 INFO L93 Difference]: Finished difference Result 3497 states and 10631 transitions. [2022-11-16 20:26:15,747 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2022-11-16 20:26:15,747 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 51 states have (on average 1.4705882352941178) internal successors, (75), 51 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 31 [2022-11-16 20:26:15,747 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:26:15,754 INFO L225 Difference]: With dead ends: 3497 [2022-11-16 20:26:15,754 INFO L226 Difference]: Without dead ends: 3484 [2022-11-16 20:26:15,755 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3954 ImplicationChecksByTransitivity, 12.5s TimeCoverageRelationStatistics Valid=1683, Invalid=14570, Unknown=3, NotChecked=0, Total=16256 [2022-11-16 20:26:15,756 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 100 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 258 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 100 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 759 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 258 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 496 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-16 20:26:15,756 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [100 Valid, 0 Invalid, 759 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 258 Invalid, 0 Unknown, 496 Unchecked, 0.2s Time] [2022-11-16 20:26:15,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3484 states. [2022-11-16 20:26:15,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3484 to 2525. [2022-11-16 20:26:15,794 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2525 states, 2524 states have (on average 3.135895404120444) internal successors, (7915), 2524 states have internal predecessors, (7915), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:26:15,800 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2525 states to 2525 states and 7915 transitions. [2022-11-16 20:26:15,800 INFO L78 Accepts]: Start accepts. Automaton has 2525 states and 7915 transitions. Word has length 31 [2022-11-16 20:26:15,800 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:26:15,800 INFO L495 AbstractCegarLoop]: Abstraction has 2525 states and 7915 transitions. [2022-11-16 20:26:15,800 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 51 states have (on average 1.4705882352941178) internal successors, (75), 51 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:26:15,800 INFO L276 IsEmpty]: Start isEmpty. Operand 2525 states and 7915 transitions. [2022-11-16 20:26:15,802 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-11-16 20:26:15,803 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:26:15,803 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:26:15,808 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Forceful destruction successful, exit code 0 [2022-11-16 20:26:16,003 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable70,68 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:26:16,003 INFO L420 AbstractCegarLoop]: === Iteration 72 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-11-16 20:26:16,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:26:16,003 INFO L85 PathProgramCache]: Analyzing trace with hash 957658843, now seen corresponding path program 69 times [2022-11-16 20:26:16,004 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:26:16,004 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1534776710] [2022-11-16 20:26:16,004 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:26:16,004 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:26:16,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:26:17,795 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:26:17,796 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:26:17,796 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1534776710] [2022-11-16 20:26:17,796 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1534776710] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:26:17,796 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1942996524] [2022-11-16 20:26:17,796 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 20:26:17,796 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:26:17,796 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:26:17,797 INFO L229 MonitoredProcess]: Starting monitored process 69 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:26:17,800 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c39f5b4b-84ea-4be8-ac62-623f20577e22/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (69)] Waiting until timeout for monitored process [2022-11-16 20:26:18,061 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 20:26:18,061 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:26:18,064 INFO L263 TraceCheckSpWp]: Trace formula consists of 323 conjuncts, 55 conjunts are in the unsatisfiable core [2022-11-16 20:26:18,065 INFO L286 TraceCheckSpWp]: Computing forward predicates...