`pmbootstrap menuconfig linux-postmarketos` causes kernel compilation error

Created by: antonok-edm

When I run pmbootstrap menuconfig linux-postmarketos, then save+exit without making any changes, the kernel configuration file becomes heavily modified and the kernel compilation fails with the following error:

In file included from /home/user/build/src/linux-4.12.4/include/uapi/linux/stddef.h:1:0,
                 from /home/user/build/src/linux-4.12.4/include/linux/stddef.h:4,
                 from /home/user/build/src/linux-4.12.4/include/uapi/linux/posix_types.h:4,
                 from /home/user/build/src/linux-4.12.4/include/uapi/linux/types.h:13,
                 from /home/user/build/src/linux-4.12.4/include/linux/types.h:5,
                 from /home/user/build/src/linux-4.12.4/fs/xfs/xfs_linux.h:21,
                 from /home/user/build/src/linux-4.12.4/fs/xfs/xfs.h:32,
                 from /home/user/build/src/linux-4.12.4/fs/xfs/xfs_super.c:19:
In function 'xfs_check_ondisk_structs',
    inlined from 'init_xfs_fs' at /home/user/build/src/linux-4.12.4/fs/xfs/xfs_super.c:1990:2:
/home/user/build/src/linux-4.12.4/include/linux/compiler.h:529:38: error: call to '__compiletime_assert_119' declared with attribute error: XFS: sizeof(xfs_dir2_sf_entry_t) is wrong, expected 3
  _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
                                      ^
/home/user/build/src/linux-4.12.4/include/linux/compiler.h:512:4: note: in definition of macro '__compiletime_assert'
    prefix ## suffix();    \
    ^~~~~~
/home/user/build/src/linux-4.12.4/include/linux/compiler.h:529:2: note: in expansion of macro '_compiletime_assert'
  _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
  ^~~~~~~~~~~~~~~~~~~
/home/user/build/src/linux-4.12.4/include/linux/bug.h:54:37: note: in expansion of macro 'compiletime_assert'
 #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
                                     ^~~~~~~~~~~~~~~~~~
/home/user/build/src/linux-4.12.4/fs/xfs/xfs_ondisk.h:22:2: note: in expansion of macro 'BUILD_BUG_ON_MSG'
  BUILD_BUG_ON_MSG(sizeof(structname) != (size), "XFS: sizeof(" \
  ^~~~~~~~~~~~~~~~
/home/user/build/src/linux-4.12.4/fs/xfs/xfs_ondisk.h:119:2: note: in expansion of macro 'XFS_CHECK_STRUCT_SIZE'
  XFS_CHECK_STRUCT_SIZE(xfs_dir2_sf_entry_t,  3);
  ^~~~~~~~~~~~~~~~~~~~~

The error seems to suggest an issue with XFS configuration, but I cannot find any related lines in the config file. The kernel compiles fine directly after a fresh pull from upstream/master (but then I cannot use menuconfig to make changes).

Output of git diff aports/main/linux-postmarketos/config-postmarketos.armhf Note that the diff is 1412 lines long, which does not seem like expected behavior.