* [Bug gdb/17756] gdb find command returns bogus results and can't find the matched value.
2014-12-25 9:20 [Bug gdb/17756] New: gdb find command returns bogus results and can't find the matched value liuyefenglin at gmail dot com
@ 2014-12-25 9:32 ` liuyefenglin at gmail dot com
2014-12-27 8:44 ` dje at google dot com
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From: liuyefenglin at gmail dot com @ 2014-12-25 9:32 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=17756
Rody Liu <liuyefenglin at gmail dot com> changed:
What |Removed |Added
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CC| |liuyefenglin at gmail dot com
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* [Bug gdb/17756] gdb find command returns bogus results and can't find the matched value.
2014-12-25 9:20 [Bug gdb/17756] New: gdb find command returns bogus results and can't find the matched value liuyefenglin at gmail dot com
2014-12-25 9:32 ` [Bug gdb/17756] " liuyefenglin at gmail dot com
@ 2014-12-27 8:44 ` dje at google dot com
2015-08-07 17:35 ` matt.street at gmail dot com
` (7 subsequent siblings)
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From: dje at google dot com @ 2014-12-27 8:44 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=17756
dje at google dot com changed:
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CC| |dje at google dot com
--- Comment #1 from dje at google dot com ---
6.8 is ancient.
It would be good to first verify the problem still exists in current gdb.
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* [Bug gdb/17756] gdb find command returns bogus results and can't find the matched value.
2014-12-25 9:20 [Bug gdb/17756] New: gdb find command returns bogus results and can't find the matched value liuyefenglin at gmail dot com
2014-12-25 9:32 ` [Bug gdb/17756] " liuyefenglin at gmail dot com
2014-12-27 8:44 ` dje at google dot com
@ 2015-08-07 17:35 ` matt.street at gmail dot com
2015-08-07 17:57 ` palves at redhat dot com
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From: matt.street at gmail dot com @ 2015-08-07 17:35 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=17756
Matthew Street <matt.street at gmail dot com> changed:
What |Removed |Added
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CC| |matt.street at gmail dot com
--- Comment #2 from Matthew Street <matt.street at gmail dot com> ---
I just confirmed this with 7.9 from Ubuntu Precise 32. I also have confirmed it
with 7.4 installed on my mac with homebrew.
Short example, I can give my data if need be:
(gdb) info proc mapping
-snip-
0xbffdf000 0xc0000000 0x21000 0x0 [stack]
find.gdb:
break test
run
find /b 0xbffdf000, 0xc0000000, 0x00
$> gdb -x find.gdb ./a.out > find.log
warning: Unable to access target memory at 0xbfffc181, halting search
But 0xbfffc181 is accessible:
(gdb) x /b 0xbfffc181
0xbfffc181: 0
And a smaller search range works fine:
(gdb) find /b 0xbfffc181, 0xbfffc191, 0x00
0xbfffc181
0xbfffc182
0xbfffc183
0xbfffc184
0xbfffc185
0xbfffc186
0xbfffc187
0xbfffc188
0xbfffc189
0xbfffc18a
0xbfffc18b
0xbfffc18c
0xbfffc18d
0xbfffc18e
0xbfffc18f
0xbfffc190
0xbfffc191
17 patterns found.
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* [Bug gdb/17756] gdb find command returns bogus results and can't find the matched value.
2014-12-25 9:20 [Bug gdb/17756] New: gdb find command returns bogus results and can't find the matched value liuyefenglin at gmail dot com
` (2 preceding siblings ...)
2015-08-07 17:35 ` matt.street at gmail dot com
@ 2015-08-07 17:57 ` palves at redhat dot com
2020-07-23 17:33 ` tromey at sourceware dot org
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From: palves at redhat dot com @ 2015-08-07 17:57 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=17756
Pedro Alves <palves at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |palves at redhat dot com
--- Comment #3 from Pedro Alves <palves at redhat dot com> ---
Looks like an off-by-one -- GDB requests one byte-too-much?
(gdb) info proc mappings
process 8283
Mapped address spaces:
0x7ffffffdd000 0x7ffffffff000 0x22000 0x0 [stack]
(gdb) find /b 0x7ffffffdd000, 0x7ffffffff000, 0xa5
warning: Unable to access 11265 bytes of target memory at 0x7fffffffc400,
halting search.
Pattern not found.
(gdb) p /x 0x7fffffffc400 + 11265
$1 = 0x7ffffffff001
(gdb)
The problem is probably in gdb/target.c:simple_search_memory.
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* [Bug gdb/17756] gdb find command returns bogus results and can't find the matched value.
2014-12-25 9:20 [Bug gdb/17756] New: gdb find command returns bogus results and can't find the matched value liuyefenglin at gmail dot com
` (3 preceding siblings ...)
2015-08-07 17:57 ` palves at redhat dot com
@ 2020-07-23 17:33 ` tromey at sourceware dot org
2020-07-23 19:00 ` tromey at sourceware dot org
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From: tromey at sourceware dot org @ 2020-07-23 17:33 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=17756
Tom Tromey <tromey at sourceware dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |tromey at sourceware dot org
--- Comment #4 from Tom Tromey <tromey at sourceware dot org> ---
Bug 11158 also is about find returning incorrect results.
I wonder if there's an easy way to reproduce this.
At least at first glance, find.exp seems pretty complete.
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* [Bug gdb/17756] gdb find command returns bogus results and can't find the matched value.
2014-12-25 9:20 [Bug gdb/17756] New: gdb find command returns bogus results and can't find the matched value liuyefenglin at gmail dot com
` (4 preceding siblings ...)
2020-07-23 17:33 ` tromey at sourceware dot org
@ 2020-07-23 19:00 ` tromey at sourceware dot org
2020-07-23 19:07 ` tromey at sourceware dot org
` (3 subsequent siblings)
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From: tromey at sourceware dot org @ 2020-07-23 19:00 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=17756
--- Comment #5 from Tom Tromey <tromey at sourceware dot org> ---
(In reply to Pedro Alves from comment #3)
> Looks like an off-by-one -- GDB requests one byte-too-much?
I think it's just findcmd.c:
search_space_len = end_addr - start_addr + 1;
0x7ffffffff000 - 0x7ffffffdd000 + 1 == 0x22001
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* [Bug gdb/17756] gdb find command returns bogus results and can't find the matched value.
2014-12-25 9:20 [Bug gdb/17756] New: gdb find command returns bogus results and can't find the matched value liuyefenglin at gmail dot com
` (5 preceding siblings ...)
2020-07-23 19:00 ` tromey at sourceware dot org
@ 2020-07-23 19:07 ` tromey at sourceware dot org
2020-07-23 19:35 ` tromey at sourceware dot org
` (2 subsequent siblings)
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From: tromey at sourceware dot org @ 2020-07-23 19:07 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=17756
--- Comment #6 from Tom Tromey <tromey at sourceware dot org> ---
(In reply to Pedro Alves from comment #3)
Off by one makes my head hurt.
> Mapped address spaces:
>
> 0x7ffffffdd000 0x7ffffffff000 0x22000 0x0 [stack]
I think this range is exclusive on the high end?
That is 0x7ffffffff000 is not included.
> (gdb) find /b 0x7ffffffdd000, 0x7ffffffff000, 0xa5
However "find" is inclusive on the high end.
Probably a bad choice (IMO) but on the other hand,
maybe more confusing to change it at this point.
So, I don't think there's a bug here.
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* [Bug gdb/17756] gdb find command returns bogus results and can't find the matched value.
2014-12-25 9:20 [Bug gdb/17756] New: gdb find command returns bogus results and can't find the matched value liuyefenglin at gmail dot com
` (6 preceding siblings ...)
2020-07-23 19:07 ` tromey at sourceware dot org
@ 2020-07-23 19:35 ` tromey at sourceware dot org
2020-10-07 18:13 ` cvs-commit at gcc dot gnu.org
2020-10-07 18:23 ` tromey at sourceware dot org
9 siblings, 0 replies; 11+ messages in thread
From: tromey at sourceware dot org @ 2020-07-23 19:35 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=17756
--- Comment #7 from Tom Tromey <tromey at sourceware dot org> ---
(In reply to Rody Liu from comment #0)
> (gdb) info target
> 0x08048000 - 0x08048000 is load1
> 0x080b2000 - 0x080b3000 is load2
> 0x080b3000 - 0x09c9e000 is load3 //Should be heap region.
> (gdb) show mem inaccessible-by-default
> Unknown memory addresses will be treated as RAM.
>
>
> //find command returns bogus results
> (gdb) find/w 0x080b3000,0x09c9e000,0x8988b90
> 0x837f948
This one could well be something weird about the target, I guess.
Without more information though it is hard to know.
> //find command can't find the matched value
> (gdb) find/w 0x0837ba00,0x0837bb00,0x8988b90
> 0x837bac8
> 1 pattern found.
> (gdb) x 0x837bac8
> 0x837bac8: 0x08988b90
> (gdb) find/w 0x08370000,0x0837bb00,0x8988b90
> Pattern not found.
I duplicated this as a unit test and couldn't reproduce
the failure.
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* [Bug gdb/17756] gdb find command returns bogus results and can't find the matched value.
2014-12-25 9:20 [Bug gdb/17756] New: gdb find command returns bogus results and can't find the matched value liuyefenglin at gmail dot com
` (7 preceding siblings ...)
2020-07-23 19:35 ` tromey at sourceware dot org
@ 2020-10-07 18:13 ` cvs-commit at gcc dot gnu.org
2020-10-07 18:23 ` tromey at sourceware dot org
9 siblings, 0 replies; 11+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2020-10-07 18:13 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=17756
--- Comment #8 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Tom Tromey <tromey@sourceware.org>:
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=485c47e523571c1053ec4cf04d4a6b2adb7b350f
commit 485c47e523571c1053ec4cf04d4a6b2adb7b350f
Author: Tom Tromey <tromey@adacore.com>
Date: Wed Oct 7 12:07:55 2020 -0600
Add simple_search_memory unit tests
This adds some unit tests for simple_search_memory. I tried here to
reproduce some bugs (PR gdb/11158 and PR gdb/17756), but was unable
to.
gdb/ChangeLog
2020-10-07 Tom Tromey <tromey@adacore.com>
* unittests/search-memory-selftests.c: New file.
* Makefile.in (SELFTESTS_SRCS): Add
unittests/search-memory-selftests.c.
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* [Bug gdb/17756] gdb find command returns bogus results and can't find the matched value.
2014-12-25 9:20 [Bug gdb/17756] New: gdb find command returns bogus results and can't find the matched value liuyefenglin at gmail dot com
` (8 preceding siblings ...)
2020-10-07 18:13 ` cvs-commit at gcc dot gnu.org
@ 2020-10-07 18:23 ` tromey at sourceware dot org
9 siblings, 0 replies; 11+ messages in thread
From: tromey at sourceware dot org @ 2020-10-07 18:23 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=17756
Tom Tromey <tromey at sourceware dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |WORKSFORME
--- Comment #9 from Tom Tromey <tromey at sourceware dot org> ---
Couldn't reproduce.
There's a unit-test now, so if it can still be reproduced,
it would be good to modify the test to demonstrate the failure.
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