[Bug remote/28360] segfault in bfd_get_elf_phdr_upper_bound

["vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=28360

--- Comment #1 from Tom de Vries <vries at gcc dot gnu.org> ---
With this:
...
diff --git a/gdb/linux-tdep.c b/gdb/linux-tdep.c
index ae2f7c14f6d..d7eaa75a34a 100644
--- a/gdb/linux-tdep.c
+++ b/gdb/linux-tdep.c
@@ -2327,7 +2327,7 @@ linux_vsyscall_range_raw (struct gdbarch *gdbarch, struct
mem_ra
nge *range)
   /* It doesn't make sense to access the host's /proc when debugging a
      core file.  Instead, look for the PT_LOAD segment that matches
      the vDSO.  */
-  if (!target_has_execution ())
+  if (!target_has_execution () && core_bfd != nullptr)
     {
       long phdrs_size;
       int num_phdrs, i;
...
we have instead:
...
(gdb) set sysroot remote:^M
warning: "remote:" is deprecated, use "target:" instead.^M
warning: sysroot set to "target:".^M
warning: unable to open /proc file '/proc/0/task/0/maps'^M
(gdb) PASS: gdb.server/server-exec-info.exp: set sysroot remote:
info files^M
(gdb) FAIL: gdb.server/server-exec-info.exp: info files
...

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