[Bug gdb/29124] New: Regressions in overlays.exp

[Bug gdb/29124] New: Regressions in overlays.exp

[craig.blackmore at embecosm dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=29124

            Bug ID: 29124
           Summary: Regressions in overlays.exp
           Product: gdb
           Version: HEAD
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: craig.blackmore at embecosm dot com
  Target Milestone: ---

overlays.exp is only tested on m32r. Until recently I was getting 81 passes
testing on the builtin m32r sim, however, there are 14 unexpected failures with
latest master commit 0ee8858e7aeca5ba5f702204daad2ddd290ef229.

Using git bisect, I found that the regressions appeared when the new DWARF
indexer was enabled in commit 3d20b8d99a54382e6e1a6c433e71e0775c6856c6. Looking
at the regressions, there seems to be an issue with symbol lookup, but I have
not tracked down the root cause. Below is a summary of the failures.

The first few regressions are for `print <symbol>` commands that end up
printing the wrong symbol:

print foo
$1 = {int (int)} 0x400000 <*foo*>
(gdb) PASS: gdb.base/overlays.exp: get foo  load address
print bar
$2 = {int (int)} 0x400024 <*foo*>
(gdb) FAIL: gdb.base/overlays.exp: get bar  load address
print baz
$3 = {int (int)} 0x400048 <*baz*>
(gdb) PASS: gdb.base/overlays.exp: get baz  load address
print grbx
$4 = {int (int)} 0x40006c <*baz*>
(gdb) FAIL: gdb.base/overlays.exp: get grbx load address
...
print bar
$10 = {int (int)} 0x300000 <foo>
(gdb) FAIL: gdb.base/overlays.exp: get bar  runtime address
...
print grbx
$12 = {int (int)} 0x380000 <baz>
(gdb) FAIL: gdb.base/overlays.exp: get grbx runtime address

Next, the test fails to find addresses for the same symbols as above (which is
done using print <symbol>):

print 0x400000   != 0x300000
$17 = 1
(gdb) PASS: gdb.base/overlays.exp: foo's LMA   != VMA
print 0   != 0
$18 = 0
(gdb) FAIL: gdb.base/overlays.exp: bar's LMA   != VMA
print 0x400048   != 0x380000
$19 = 1
(gdb) PASS: gdb.base/overlays.exp: baz's LMA   != VMA
print 0  != 0
$20 = 0
(gdb) FAIL: gdb.base/overlays.exp: grbx's LMA  != VMA

Then, for the same symbols, GDB sets breakpoints on the wrong symbol:

break foo
Breakpoint 2 at 0x300008: file binutils-gdb/gdb/testsuite/gdb.base/foo.c, line
5.
(gdb) PASS: gdb.base/overlays.exp: break foo
break bar
Note: breakpoint 2 also set at pc 0x300008.
Breakpoint 3 at 0x300008: file binutils-gdb/gdb/testsuite/gdb.base/foo.c, line
5.
(gdb) FAIL: gdb.base/overlays.exp: break bar
break baz
Breakpoint 4 at 0x380008: file binutils-gdb/gdb/testsuite/gdb.base/baz.c, line
5.
(gdb) PASS: gdb.base/overlays.exp: break baz
break grbx
Note: breakpoint 4 also set at pc 0x380008.
Breakpoint 5 at 0x380008: file binutils-gdb/gdb/testsuite/gdb.base/baz.c, line
5.
(gdb) FAIL: gdb.base/overlays.exp: break grbx

The remaining 6 failures are due to failing to hit the above breakpoints in the
expected place and produce the expected backtrace.

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[Bug gdb/29124] Regressions in gdb.base/overlays.exp

[craig.blackmore at embecosm dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=29124

Craig Blackmore <craig.blackmore at embecosm dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|Regressions in overlays.exp |Regressions in
                   |                            |gdb.base/overlays.exp

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[Bug gdb/29124] Regressions in gdb.base/overlays.exp

[tromey at sourceware dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=29124

Tom Tromey <tromey at sourceware dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|unassigned at sourceware dot org   |tromey at sourceware dot org
                 CC|                            |tromey at sourceware dot org

--- Comment #1 from Tom Tromey <tromey at sourceware dot org> ---
Thanks for the report.
I don't know how to set up to test m32r with the sim...
but if you could attach the test program that is built
by overlays.exp, that would be enough for for to debug.

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[Bug gdb/29124] Regressions in gdb.base/overlays.exp

[craig.blackmore at embecosm dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=29124

--- Comment #2 from Craig Blackmore <craig.blackmore at embecosm dot com> ---
Created attachment 14098
  --> https://sourceware.org/bugzilla/attachment.cgi?id=14098&action=edit
overlays binary

The overlays binary built by overlays.exp.

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