There is a run-debuginfod-federation-metrics.sh failure that must be
unrelated. It is an odd crash in the shell script wait statement?

But there are also a few failures compiling the new testcase:

In file included from /usr/include/features.h:490,
                 from /usr/include/assert.h:35,
                 from dwfl-report-offline-memory.c:18:
In function ‘read’,
    inlined from ‘main’ at dwfl-report-offline-memory.c:68:23:
/usr/include/bits/unistd.h:38:10: error: ‘__read_alias’ specified size 18446744073709551615 exceeds maximum object size 9223372036854775807 [-Werror=stringop-overflow=]
   38 |   return __glibc_fortify (read, __nbytes, sizeof (char),
      |          ^~~~~~~~~~~~~~~
/usr/include/bits/unistd.h: In function ‘main’:
/usr/include/bits/unistd.h:26:16: note: in a call to function ‘__read_alias’ declared with attribute ‘access (write_only, 2, 3)’
   26 | extern ssize_t __REDIRECT (__read_alias, (int __fd, void *__buf,
      |                ^~~~~~~~~~
cc1: all warnings being treated as errors
make[2]: *** [Makefile:2461: dwfl-report-offline-memory.o] Error 1

This seems technically correct since we use the wrong types size_t vs
off_t and ssize_t and don't check the results from lseek, read and
malloc.

Patch to fix that attached.

And there is an error on 32bit systems:
tests/dwfl-report-offline-memory contains non-lfs symbols: lseek open

Fix that by including config.h earlier.

Cheers,

Mark