* [Bug c++/18590] GDB memory leak (5+ GB) with Qt Creator in python theDumper.showData
[not found] <bug-18590-4717@http.sourceware.org/bugzilla/>
@ 2015-06-24 11:17 ` szotsaki at gmail dot com
2015-06-24 11:18 ` szotsaki at gmail dot com
` (3 subsequent siblings)
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From: szotsaki at gmail dot com @ 2015-06-24 11:17 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=18590
--- Comment #1 from Ákos Szőts <szotsaki at gmail dot com> ---
Created attachment 8387
--> https://sourceware.org/bugzilla/attachment.cgi?id=8387&action=edit
First backtrace of the running GDB
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From: "szotsaki at gmail dot com" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug c++/18590] New: GDB memory leak (5+ GB) with Qt Creator in
python theDumper.showData
Date: Wed, 24 Jun 2015 11:17:00 -0000
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https://sourceware.org/bugzilla/show_bug.cgi?id\x18590
Bug ID: 18590
Summary: GDB memory leak (5+ GB) with Qt Creator in python
theDumper.showData
Product: gdb
Version: 7.8
Status: NEW
Severity: normal
Priority: P2
Component: c++
Assignee: unassigned at sourceware dot org
Reporter: szotsaki at gmail dot com
Target Milestone: ---
In my project the program stopped at a break point and then Qt Creator wanted
to show the stack with pretty printing. However, in a minute GDB used around 5
GB of memory and was growing further.
I attach the following files:
- gdb bt-1 and gdb bt-2: two backtraces of GDB at different times
- gdb issued commands: the issued commands by Qt Creator
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^ permalink raw reply [flat|nested] 5+ messages in thread* [Bug c++/18590] GDB memory leak (5+ GB) with Qt Creator in python theDumper.showData
[not found] <bug-18590-4717@http.sourceware.org/bugzilla/>
2015-06-24 11:17 ` [Bug c++/18590] GDB memory leak (5+ GB) with Qt Creator in python theDumper.showData szotsaki at gmail dot com
@ 2015-06-24 11:18 ` szotsaki at gmail dot com
2015-06-24 15:24 ` szotsaki at gmail dot com
` (2 subsequent siblings)
4 siblings, 0 replies; 5+ messages in thread
From: szotsaki at gmail dot com @ 2015-06-24 11:18 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=18590
--- Comment #2 from Ákos Szőts <szotsaki at gmail dot com> ---
Created attachment 8388
--> https://sourceware.org/bugzilla/attachment.cgi?id=8388&action=edit
Second backtrace of the running GDB
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>From gdb-prs-return-18260-listarch-gdb-prs=sources.redhat.com@sourceware.org Wed Jun 24 11:19:18 2015
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From: "szotsaki at gmail dot com" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug c++/18590] GDB memory leak (5+ GB) with Qt Creator in python
theDumper.showData
Date: Wed, 24 Jun 2015 11:19:00 -0000
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--- Comment #3 from Ákos Szőts <szotsaki at gmail dot com> ---
Created attachment 8389
--> https://sourceware.org/bugzilla/attachment.cgi?id=8389&action=edit
Commands issued to GDB by Qt Creator
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>From gdb-prs-return-18261-listarch-gdb-prs=sources.redhat.com@sourceware.org Wed Jun 24 14:46:18 2015
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From: "dje at google dot com" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug c++/18590] GDB memory leak (5+ GB) with Qt Creator in python
theDumper.showData
Date: Wed, 24 Jun 2015 14:46:00 -0000
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dje at google dot com changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |dje at google dot com
--- Comment #4 from dje at google dot com ---
Sometimes what seem to be memory leaks is actually poor processing of debug
info, with gdb expanding far more debug info than necessary.
It would be helpful to run the backtrace again, but doing "set debug
symtab-create 1" first, and then seeing the output of the backtrace.
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[not found] <bug-18590-4717@http.sourceware.org/bugzilla/>
2015-06-24 11:17 ` [Bug c++/18590] GDB memory leak (5+ GB) with Qt Creator in python theDumper.showData szotsaki at gmail dot com
2015-06-24 11:18 ` szotsaki at gmail dot com
@ 2015-06-24 15:24 ` szotsaki at gmail dot com
2015-10-10 17:51 ` szotsaki at gmail dot com
2023-06-09 20:04 ` tromey at sourceware dot org
4 siblings, 0 replies; 5+ messages in thread
From: szotsaki at gmail dot com @ 2015-06-24 15:24 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=18590
Ákos Szőts <szotsaki at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Attachment #8387|0 |1
is obsolete| |
Attachment #8388|0 |1
is obsolete| |
--- Comment #5 from Ákos Szőts <szotsaki at gmail dot com> ---
Created attachment 8390
--> https://sourceware.org/bugzilla/attachment.cgi?id=8390&action=edit
Debug output with symtab-create 1
I re-ran the program now with "set debug symtab-create 1" before "bt"; I attach
its output.
Apart from this, I think I also can provide a short example code. When Qt
Creator tries to list the stack on the 10th line (the "for" loop), GDB starts
eating a lot of memory.
Here is the code:
#include <vector>
int main()
{
std::vector<int> testVector;
testVector.push_back(0);
int i = 0;
for (const auto& vector: testVector) {
i += vector;
}
return i;
}
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From: "dje at google dot com" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug c++/18590] GDB memory leak (5+ GB) with Qt Creator in python
theDumper.showData
Date: Wed, 24 Jun 2015 15:29:00 -0000
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--- Comment #6 from dje at google dot com ---
Thanks.
I see only 26 symtabs created so that theory is shot.
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` (2 preceding siblings ...)
2015-06-24 15:24 ` szotsaki at gmail dot com
@ 2015-10-10 17:51 ` szotsaki at gmail dot com
2023-06-09 20:04 ` tromey at sourceware dot org
4 siblings, 0 replies; 5+ messages in thread
From: szotsaki at gmail dot com @ 2015-10-10 17:51 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=18590
Ákos Szőts <szotsaki at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Version|7.8 |7.9
--- Comment #7 from Ákos Szőts <szotsaki at gmail dot com> ---
„Successfully” reproducible with version 7.9.1.
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>From gdb-prs-return-18682-listarch-gdb-prs=sources.redhat.com@sourceware.org Sun Oct 11 07:43:42 2015
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Mike Frysinger <vapier at gentoo dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #6 from Mike Frysinger <vapier at gentoo dot org> ---
thanks, i've committed a fix to the master branch now
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` (3 preceding siblings ...)
2015-10-10 17:51 ` szotsaki at gmail dot com
@ 2023-06-09 20:04 ` tromey at sourceware dot org
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From: tromey at sourceware dot org @ 2023-06-09 20:04 UTC (permalink / raw)
To: gdb-prs
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Tom Tromey <tromey at sourceware dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |tromey at sourceware dot org
--- Comment #8 from Tom Tromey <tromey at sourceware dot org> ---
We don't know what "python theDumper.showData" does, but
it's possible that it created a lot of values and
"leaked" them since they were on the value chain.
I don't recall if this problem was fixed before or after 7.9.
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