Dear maintainer, since this bug currently blocks the python3.10-default transition, I've prepared an NMU for unbound (versioned as 1.13.1-1.1). The diff is attached to this message.
Cheers -- Sebastian Ramacher
diff -Nru unbound-1.13.1/debian/changelog unbound-1.13.1/debian/changelog
--- unbound-1.13.1/debian/changelog 2021-02-09 23:53:57.000000000 +0100
+++ unbound-1.13.1/debian/changelog 2022-04-06 21:37:02.000000000 +0200
@@ -1,3 +1,13 @@
+unbound (1.13.1-1.1) unstable; urgency=medium
+
+ * Non-maintainer upload
+
+ [ Rico Tzschichholz ]
+ * Cherry-pick upstream commits for Python 3.10 compatibility (Closes:
+ #1008641)
+
+ -- Sebastian Ramacher <sramac...@debian.org> Wed, 06 Apr 2022 21:37:02 +0200
+
unbound (1.13.1-1) unstable; urgency=medium
* New upstream version 1.13.1
diff -Nru unbound-1.13.1/debian/patches/python3.10-2.patch unbound-1.13.1/debian/patches/python3.10-2.patch
--- unbound-1.13.1/debian/patches/python3.10-2.patch 1970-01-01 01:00:00.000000000 +0100
+++ unbound-1.13.1/debian/patches/python3.10-2.patch 2022-04-06 21:35:02.000000000 +0200
@@ -0,0 +1,26 @@
+From 92d01d82658ffc3992e4468472d3c8c080f8b16c Mon Sep 17 00:00:00 2001
+From: Victor Stinner <vstin...@python.org>
+Date: Tue, 16 Feb 2021 11:11:06 +0100
+Subject: [PATCH] Fix #426: Replace _Py_fopen() with fopen() in pythonmod.c
+
+The private _Py_fopen() function has been removed in Python 3.10.
+
+Fix build on Python 3.10.
+---
+ doc/Changelog | 1 +
+ pythonmod/pythonmod.c | 2 +-
+ 2 files changed, 2 insertions(+), 1 deletion(-)
+
+diff --git a/pythonmod/pythonmod.c b/pythonmod/pythonmod.c
+index 040ff7051..6e60d02fe 100644
+--- a/pythonmod/pythonmod.c
++++ b/pythonmod/pythonmod.c
+@@ -338,7 +338,7 @@ int pythonmod_init(struct module_env* env, int id)
+ PyFileObject = PyFile_FromString((char*)pe->fname, "r");
+ script_py = PyFile_AsFile(PyFileObject);
+ #else
+- script_py = _Py_fopen(pe->fname, "r");
++ script_py = fopen(pe->fname, "r");
+ #endif
+ if (script_py == NULL)
+ {
diff -Nru unbound-1.13.1/debian/patches/python3.10.patch unbound-1.13.1/debian/patches/python3.10.patch
--- unbound-1.13.1/debian/patches/python3.10.patch 1970-01-01 01:00:00.000000000 +0100
+++ unbound-1.13.1/debian/patches/python3.10.patch 2022-04-06 21:35:02.000000000 +0200
@@ -0,0 +1,101 @@
+From e0d426ebb10653a78bf5c4053198f6ac19bfcd3e Mon Sep 17 00:00:00 2001
+From: "W.C.A. Wijngaards" <wou...@nlnetlabs.nl>
+Date: Tue, 9 Feb 2021 10:38:55 +0100
+Subject: [PATCH] - Fix for Python 3.9, no longer use deprecated functions of
+ PyEval_CallObject (now PyObject_Call), PyEval_InitThreads (now none),
+ PyParser_SimpleParseFile (now Py_CompileString).
+
+---
+ doc/Changelog | 5 +++++
+ libunbound/python/libunbound.i | 6 +++++
+ pythonmod/pythonmod.c | 41 ++++++++++++++++++++++++++++++++++
+ 3 files changed, 52 insertions(+)
+
+diff --git a/libunbound/python/libunbound.i b/libunbound/python/libunbound.i
+index a23c45b9c..ab244a6fb 100644
+--- a/libunbound/python/libunbound.i
++++ b/libunbound/python/libunbound.i
+@@ -916,7 +916,13 @@ int _ub_resolve_async(struct ub_ctx* ctx, char* name, int rrtype, int rrclass, v
+ struct cb_data* id;
+ id = (struct cb_data*) iddata;
+ arglist = Py_BuildValue("(OiO)",id->data,status, SWIG_NewPointerObj(SWIG_as_voidptr(result), SWIGTYPE_p_ub_result, 0 | 0 )); // Build argument list
++#if PY_MAJOR_VERSION <= 2 || (PY_MAJOR_VERSION == 3 && PY_MINOR_VERSION < 9)
++ /* for python before 3.9 */
+ fresult = PyEval_CallObject(id->func,arglist); // Call Python
++#else
++ /* for python 3.9 and newer */
++ fresult = PyObject_Call(id->func,arglist,NULL);
++#endif
+ Py_DECREF(id->func);
+ Py_DECREF(id->data);
+ free(id);
+diff --git a/pythonmod/pythonmod.c b/pythonmod/pythonmod.c
+index 9006429ef..040ff7051 100644
+--- a/pythonmod/pythonmod.c
++++ b/pythonmod/pythonmod.c
+@@ -299,7 +299,10 @@ int pythonmod_init(struct module_env* env, int id)
+ PyImport_AppendInittab(SWIG_name, (void*)SWIG_init);
+ #endif
+ Py_Initialize();
++#if PY_MAJOR_VERSION <= 2 || (PY_MAJOR_VERSION == 3 && PY_MINOR_VERSION <= 6)
++ /* initthreads only for python 3.6 and older */
+ PyEval_InitThreads();
++#endif
+ SWIG_init();
+ mainthr = PyEval_SaveThread();
+ }
+@@ -354,6 +357,8 @@ int pythonmod_init(struct module_env* env, int id)
+ /* TODO: deallocation of pe->... if an error occurs */
+
+ if (PyRun_SimpleFile(script_py, pe->fname) < 0) {
++#if PY_MAJOR_VERSION <= 2 || (PY_MAJOR_VERSION == 3 && PY_MINOR_VERSION < 9)
++ /* for python before 3.9 */
+ log_err("pythonmod: can't parse Python script %s", pe->fname);
+ /* print the error to logs too, run it again */
+ fseek(script_py, 0, SEEK_SET);
+@@ -369,9 +374,45 @@ int pythonmod_init(struct module_env* env, int id)
+ /* ignore the NULL return of _node, it is NULL due to the parse failure
+ * that we are expecting */
+ (void)PyParser_SimpleParseFile(script_py, pe->fname, Py_file_input);
++#else
++ /* for python 3.9 and newer */
++ char* fstr = NULL;
++ size_t flen = 0;
++ log_err("pythonmod: can't parse Python script %s", pe->fname);
++ /* print the error to logs too, run it again */
++ fseek(script_py, 0, SEEK_END);
++ flen = (size_t)ftell(script_py);
++ fstr = malloc(flen+1);
++ if(!fstr) {
++ log_err("malloc failure to print parse error");
++ PyGILState_Release(gil);
++ fclose(script_py);
++ return 0;
++ }
++ fseek(script_py, 0, SEEK_SET);
++ if(fread(fstr, flen, 1, script_py) < 1) {
++ log_err("file read failed to print parse error: %s: %s",
++ pe->fname, strerror(errno));
++ PyGILState_Release(gil);
++ fclose(script_py);
++ free(fstr);
++ return 0;
++ }
++ fstr[flen] = 0;
++ /* we compile the string, but do not run it, to stop side-effects */
++ /* ignore the NULL return of _node, it is NULL due to the parse failure
++ * that we are expecting */
++ (void)Py_CompileString(fstr, pe->fname, Py_file_input);
++#endif
+ log_py_err();
+ PyGILState_Release(gil);
+ fclose(script_py);
++#if PY_MAJOR_VERSION <= 2 || (PY_MAJOR_VERSION == 3 && PY_MINOR_VERSION < 9)
++ /* no cleanup needed for python before 3.9 */
++#else
++ /* cleanup for python 3.9 and newer */
++ free(fstr);
++#endif
+ return 0;
+ }
+ #if PY_MAJOR_VERSION < 3
diff -Nru unbound-1.13.1/debian/patches/series unbound-1.13.1/debian/patches/series
--- unbound-1.13.1/debian/patches/series 2021-02-09 23:53:57.000000000 +0100
+++ unbound-1.13.1/debian/patches/series 2022-04-06 21:36:13.000000000 +0200
@@ -1 +1,3 @@
0001-Enable-remote-control-by-default.patch
+python3.10.patch
+python3.10-2.patch
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