Repository: borgbackup/borg

Issue:
EINVAL error when processing xattrs (borg 1.2.1)
Some files on my system, when they are being backed up, cause `borg` to emit this:

```
Aug 23 02:37:18 penny.dragonfear borg-offsite-backup[937998]: srv/shared/Albums/Bolitas de agua saltan/PXL_20220324_124712302.mp4: extended stat: [Errno 22] Invalid argument: '<FD 12>'
```

This causes the backup to finish with error code 1.

Of note is that the files have extended attributes:

```
[root@penny /]# getfattr 'srv/shared/Albums/Bolitas de agua saltan/PXL_20220324_124712302.mp4'
# file: srv/shared/Albums/Bolitas de agua saltan/PXL_20220324_124712302.mp4
user.DOSATTRIB
user.security.selinux
```

This did not appear to happen with `borg` 1.2.0.

I use Fedora 36 and ZFS.


Discussion:
Strange, that "<FD 12>" means file descriptor 12 (== an open file) and not sure what could be invalid with that.

Also not sure where exactly the exception comes from, all these are done under "extended stat":
- ("bsd" / fs)flags
- xattrs
- ACLs

Do you run borg as root? Is the effect reproducible?

Also, as far as I remember right now, there was no change to the extended stats or xattrs code between 1.2.0 and 1.2.1 (nor between 1.2.1 and 1.2.2).


Resolving patch:
diff --git a/src/borg/archive.py b/src/borg/archive.py
--- a/src/borg/archive.py
+++ b/src/borg/archive.py
@@ -1157,15 +1157,19 @@ def stat_simple_attrs(self, st):
 
     def stat_ext_attrs(self, st, path, fd=None):
         attrs = {}
-        with backup_io('extended stat'):
-            flags = 0 if self.noflags else get_flags(path, st, fd=fd)
-            xattrs = {} if self.noxattrs else xattr.get_all(fd or path, follow_symlinks=False)
-            if not self.noacls:
+        if not self.noflags:
+            with backup_io('extended stat (flags)'):
+                flags = get_flags(path, st, fd=fd)
+            if flags:
+                attrs['bsdflags'] = flags
+        if not self.noxattrs:
+            with backup_io('extended stat (xattrs)'):
+                xattrs = xattr.get_all(fd or path, follow_symlinks=False)
+            if xattrs:
+                attrs['xattrs'] = StableDict(xattrs)
+        if not self.noacls:
+            with backup_io('extended stat (ACLs)'):
                 acl_get(path, attrs, st, self.numeric_ids, fd=fd)
-        if xattrs:
-            attrs['xattrs'] = StableDict(xattrs)
-        if flags:
-            attrs['bsdflags'] = flags
         return attrs
 
     def stat_attrs(self, st, path, fd=None):
diff --git a/src/borg/testsuite/archiver.py b/src/borg/testsuite/archiver.py
--- a/src/borg/testsuite/archiver.py
+++ b/src/borg/testsuite/archiver.py
@@ -1393,7 +1393,7 @@ def patched_fchown(fd, uid, gid):
                 self.cmd('extract', self.repository_location + '::test')
             assert xattr.getxattr(b'input/file', b'security.capability') == capabilities
 
-    @pytest.mark.skipif(not xattr.XATTR_FAKEROOT, reason='xattr not supported on this system or on this version of'
+    @pytest.mark.skipif(not xattr.XATTR_FAKEROOT, reason='xattr not supported on this system or on this version of '
                                                          'fakeroot')
     def test_extract_xattrs_errors(self):
         def patched_setxattr_E2BIG(*args, **kwargs):
@@ -3486,7 +3486,7 @@ def test_detect_attic_repo(self):
             assert 'Attic repository detected.' in output
 
     # derived from test_extract_xattrs_errors()
-    @pytest.mark.skipif(not xattr.XATTR_FAKEROOT, reason='xattr not supported on this system or on this version of'
+    @pytest.mark.skipif(not xattr.XATTR_FAKEROOT, reason='xattr not supported on this system or on this version of '
                                                          'fakeroot')
     def test_do_not_fail_when_percent_is_in_xattr_name(self):
         """https://github.com/borgbackup/borg/issues/6063"""
@@ -3502,7 +3502,7 @@ def patched_setxattr_EACCES(*args, **kwargs):
                 self.cmd('extract', self.repository_location + '::test', exit_code=EXIT_WARNING)
 
     # derived from test_extract_xattrs_errors()
-    @pytest.mark.skipif(not xattr.XATTR_FAKEROOT, reason='xattr not supported on this system or on this version of'
+    @pytest.mark.skipif(not xattr.XATTR_FAKEROOT, reason='xattr not supported on this system or on this version of '
                                                          'fakeroot')
     def test_do_not_fail_when_percent_is_in_file_name(self):
         """https://github.com/borgbackup/borg/issues/6063"""
diff --git a/src/borg/xattr.py b/src/borg/xattr.py
--- a/src/borg/xattr.py
+++ b/src/borg/xattr.py
@@ -80,21 +80,14 @@ def get_all(path, follow_symlinks=False):
                 # borg always did it like that...
                 result[name] = getxattr(path, name, follow_symlinks=follow_symlinks) or None
             except OSError as e:
-                name_str = name.decode()
-                if isinstance(path, int):
-                    path_str = '<FD %d>' % path
-                else:
-                    path_str = os.fsdecode(path)
-                if e.errno == ENOATTR:
-                    # if we get ENOATTR, a race has happened: xattr names were deleted after list.
-                    # we just ignore the now missing ones. if you want consistency, do snapshots.
+                # note: platform.xattr._check has already made a nice exception e with errno, msg, path/fd
+                if e.errno in (ENOATTR, ):  # errors we just ignore silently
+                    # ENOATTR: a race has happened: xattr names were deleted after list.
                     pass
-                elif e.errno == errno.EPERM:
-                    # we were not permitted to read this attribute, still can continue trying to read others
-                    logger.warning('{}: Operation not permitted when reading extended attribute {}'.format(
-                                   path_str, name_str))
-                else:
-                    raise
+                else:  # all others: warn, skip this single xattr name, continue processing other xattrs
+                    # EPERM: we were not permitted to read this attribute
+                    # EINVAL: maybe xattr name is invalid or other issue, #6988
+                    logger.warning('when getting extended attribute %s: %s', name.decode(errors='replace'), str(e))
     except OSError as e:
         if e.errno in (errno.ENOTSUP, errno.EPERM):
             # if xattrs are not supported on the filesystem, we give up.
@@ -126,24 +119,18 @@ def set_all(path, xattrs, follow_symlinks=False):
             # if we have a None value, it means "empty", so give b'' to setxattr in that case:
             setxattr(path, k, v or b'', follow_symlinks=follow_symlinks)
         except OSError as e:
+            # note: platform.xattr._check has already made a nice exception e with errno, msg, path/fd
             warning = True
-            k_str = k.decode()
-            if isinstance(path, int):
-                path_str = '<FD %d>' % path
-            else:
-                path_str = os.fsdecode(path)
             if e.errno == errno.E2BIG:
-                err_str = 'too big for this filesystem'
-            elif e.errno == errno.ENOTSUP:
-                err_str = 'xattrs not supported on this filesystem'
+                err_str = 'too big for this filesystem (%s)' % str(e)
             elif e.errno == errno.ENOSPC:
                 # ext4 reports ENOSPC when trying to set an xattr with >4kiB while ext4 can only support 4kiB xattrs
                 # (in this case, this is NOT a "disk full" error, just a ext4 limitation).
-                err_str = 'no space left on device [xattr len = %d]' % (len(v),)
+                err_str = 'fs full or xattr too big? [xattr len = %d] (%s)' % (len(v), str(e))
             else:
                 # generic handler
                 # EACCES: permission denied to set this specific xattr (this may happen related to security.* keys)
                 # EPERM: operation not permitted
-                err_str = os.strerror(e.errno)
-            logger.warning('%s: when setting extended attribute %s: %s', path_str, k_str, err_str)
+                err_str = str(e)
+            logger.warning('when setting extended attribute %s: %s', k.decode(errors='replace'), err_str)
     return warning


Test patch: