{"record":{"id":"79537fcb34d5d037","repo":"go-delve/delve","slug":"procstat-open-sysctl-failed-v","errorCode":null,"errorMessage":"procstat_open_sysctl failed: %v","messagePattern":"procstat_open_sysctl failed: (.+?)","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"pkg/proc/native/proc_freebsd.go","lineNumber":586,"sourceCode":"\n\treturn pickedTrapThread, nil\n}\n\n// Used by Detach\nfunc (dbp *nativeProcess) detach(kill bool) error {\n\tif !kill {\n\t\tfor _, th := range dbp.threads {\n\t\t\tptraceResume(th.ID)\n\t\t}\n\t}\n\treturn ptraceDetach(dbp.pid)\n}\n\n// EntryPoint returns the entry point address of the process.\nfunc (dbp *nativeProcess) EntryPoint() (uint64, error) {\n\tps, err := C.procstat_open_sysctl()\n\tif err != nil {\n\t\treturn 0, fmt.Errorf(\"procstat_open_sysctl failed: %v\", err)\n\t}\n\tdefer C.procstat_close(ps)\n\n\tvar count C.uint\n\tkipp, err := C.procstat_getprocs(ps, C.KERN_PROC_PID, C.int(dbp.pid), &count)\n\tif err != nil {\n\t\treturn 0, fmt.Errorf(\"procstat_getprocs failed: %v\", err)\n\t}\n\tdefer C.procstat_freeprocs(ps, kipp)\n\tif count == 0 {\n\t\treturn 0, errors.New(\"procstat_getprocs returned no processes\")\n\t}\n\n\tauxv, err := C.procstat_getauxv(ps, kipp, &count)\n\tif err != nil {\n\t\treturn 0, fmt.Errorf(\"procstat_getauxv failed: %v\", err)\n\t}\n\tdefer C.procstat_freeauxv(ps, auxv)","sourceCodeStart":568,"sourceCodeEnd":604,"githubUrl":"https://github.com/go-delve/delve/blob/a23773e6c31361e43246bc43a424ee009679b174/pkg/proc/native/proc_freebsd.go#L568-L604","documentation":"nativeProcess.EntryPoint on FreeBSD calls libprocstat's procstat_open_sysctl() to obtain a handle on kernel process information. If that open fails, delve reports 'procstat_open_sysctl failed'. Without this handle the entry point (AT_ENTRY from the auxiliary vector) cannot be located.","triggerScenarios":"Calling EntryPoint (directly or via debugger APIs that need the entry address, e.g. setting breakpoints at process start) on FreeBSD when procstat_open_sysctl fails — typically due to kernel metadata (kvm) access restrictions.","commonSituations":"Running as unprivileged user with restricted access to kernel process data (security.bsd.see_other_uids, jail/ Capsicum restrictions); FreeBSD versions lacking the procstat auxv API; delve built against mismatched libprocstat headers.","solutions":["Run delve as root (or the same user as the target) so kernel process metadata is readable.","Verify the target pid exists: procstat -a | grep <pid>.","Check you are on a FreeBSD version whose libprocstat supports procstat_getauxv (FreeBSD 12+); otherwise entry-point lookup cannot work.","As a workaround, read AT_ENTRY from the binary's auxv via other means or set breakpoints at explicit addresses."],"exampleFix":"// before\nep, err := dbp.EntryPoint() // procstat_open_sysctl failed: ...\n\n// after\nep, err := dbp.EntryPoint()\nif err != nil {\n    // fall back to ELF entry if procstat is unavailable\n    if f, ferr := elf.Open(exePath); ferr == nil {\n        ep = f.Entry\n    }\n}","handlingStrategy":"fallback","validationCode":"// FreeBSD: verify procstat availability before relying on EntryPoint\nfunc procstatAvailable() bool {\n    return exec.Command(\"procstat\", \"-a\").Run() == nil\n}","typeGuard":null,"tryCatchPattern":"ep, err := proc.EntryPoint()\nif err != nil && strings.Contains(err.Error(), \"procstat_open_sysctl failed\") {\n    // fall back to ELF entry point\n    if f, ferr := elf.Open(exePath); ferr == nil {\n        ep, err = f.Entry, nil\n        f.Close()\n    }\n}","preventionTips":["Run as root or the target's owner for kernel metadata access.","Verify FreeBSD 12+ (procstat_getauxv dependency).","Confirm the pid is alive before entry-point lookups.","Provide an ELF-entry fallback in tooling that needs the entry address."],"tags":["freebsd","procstat","entry-point","permissions"],"backgroundTag":"procstat-open-failed","analyzedSha":"a23773e6c31361e43246bc43a424ee009679b174","analyzedAt":"2026-08-31T15:12:45.221Z","schemaVersion":2},"datasetVersion":"2026-08-31T19:17:28.585Z"}