[Bug tdep/26170] New: gdb.base/testenv.exp loops on Linux/sparc64

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

https://sourceware.org/bugzilla/show_bug.cgi?id=26170

            Bug ID: 26170
           Summary: gdb.base/testenv.exp loops on Linux/sparc64
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: tdep
          Assignee: unassigned at sourceware dot org
          Reporter: ro at gcc dot gnu.org
  Target Milestone: ---
              Host: sparc64-unknown-linux-gnu
            Target: sparc64-unknown-linux-gnu
             Build: sparc64-unknown-linux-gnu

While testing current master on Linux/sparc64, the gdb.base/testenv.exp would
loop:

PASS: gdb.base/testenv.exp: test_inherit_env_var: test1: test passing
TEST_GDB_G
LOBAL to GDB
FAIL: gdb.base/testenv.exp: test_inherit_env_var: test1: TEST_GDB_GLOBAL, get
nu
m vars
FAIL: gdb.base/testenv.exp: test_inherit_env_var: test1: TEST_GDB_GLOBAL,
confir
med
FAIL: gdb.base/testenv.exp: test_inherit_env_var: test1: printf "var: %s\n",
env
p[0] ? envp[0] : ""
[...]
FAIL: gdb.base/testenv.exp: test_inherit_env_var: test1: printf "var: %s\n",
envp[4443985] ? envp[4443985] : ""

which I only noticed after those 4.4+ million iterations.

The failure mode is like this:
(gdb) run 
Starting program:
/home/ro/obj/gdb/master/dist/gdb/testsuite/outputs/gdb.base/testenv/testenv 
Program found 0 variables starting with TEST_GDB

Breakpoint 1, main (argc=<error reading variable: Cannot access memory at
address 0x884>, argv=<error reading variable: Cannot access memory at address
0x88c>, envp=<error reading variable: Cannot access memory at address 0x894>)
at /home/ro/src/gdb/master/dist/gdb/testsuite/gdb.base/testenv.c:42
42          return 0; /* set breakpoint here.  */
(gdb) print /d j
Cannot access memory at address 0x7fc
(gdb) FAIL: gdb.base/testenv.exp: test_set_unset_env: test1: no TEST_GDB vars,
get num vars
FAIL: gdb.base/testenv.exp: test_set_unset_env: test1: no TEST_GDB vars,
confirmed

[...]

printf "var: %s\n", envp[4443985] ? envp[4443985] : ""
Cannot access memory at address 0x894
(gdb) FAIL: gdb.base/testenv.exp: test_inherit_env_var: test1: printf "var:
%s\n", envp[4443985] ? envp[4443985] : ""

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