public inbox for gcc-bugs@sourceware.org
help / color / mirror / Atom feed
* [Bug c++/102237] New: longjmp leaks catched std::runtime_error
@ 2021-09-08 2:19 david.cortes.rivera at gmail dot com
2021-09-08 2:46 ` [Bug c++/102237] [DR2361] " pinskia at gcc dot gnu.org
2021-09-08 2:47 ` pinskia at gcc dot gnu.org
0 siblings, 2 replies; 3+ messages in thread
From: david.cortes.rivera at gmail dot com @ 2021-09-08 2:19 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102237
Bug ID: 102237
Summary: longjmp leaks catched std::runtime_error
Product: gcc
Version: 10.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: david.cortes.rivera at gmail dot com
Target Milestone: ---
Created attachment 51425
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=51425&action=edit
ii_file
I am experiencing a memory leak when using long jumps from a catch block in
which the jump takes to a different function. Basically, the exception objects
are not getting destructed.
>From what I gather from this SO question:
https://stackoverflow.com/questions/69092014/c-will-an-stdruntime-error-object-leak-in-a-longjmp
calling something like "catch(std::exception &e) {longjmp(jump_buffer, 1);}"
should be allowed by the standard, and the exception should be destructed along
the way.
For example, the following code ***works as expected***:
-------
#include <stdexcept>
#include <stdio.h>
#include <setjmp.h>
void my_fun()
{
jmp_buf jump_buffer;
if (setjmp(jump_buffer))
return;
try {
std::string message;
message.resize(100);
snprintf(&message[0], 100, "error code %d\n", 3);
throw std::runtime_error(message);
}
catch (std::runtime_error &e) {
longjmp(jump_buffer, 1);
}
}
int main()
{
for (int ix = 0; ix < 100000; ix++)
void my_fun();
return 0;
}
-------
...
But ***if I switch the jump buffer to be outside of the function***, it will
now start leaking memory at each call:
-------
#include <stdexcept>
#include <stdio.h>
#include <setjmp.h>
jmp_buf jump_buffer;
void my_fun()
{
try {
std::string message;
message.resize(100);
snprintf(&message[0], 100, "error code %d\n", 3);
throw std::runtime_error(message);
}
catch (std::runtime_error &e) {
longjmp(jump_buffer, 1);
}
}
void call_myfun()
{
if (setjmp(jump_buffer))
return;
my_fun();
}
int main()
{
for (int ix = 0; ix < 100000; ix++)
call_myfun();
return 0;
}
-------
Setup info:
- AMD Ryzen 7 2700.
- Debian linux (sid)
- gcc --version: gcc (Debian 10.3.0-9) 10.3.0
The source file is compiled with the default options (g++ file.cpp). The leak
is detected by valgrind-3.16.1.
Attached is the .ii file.
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c++/102237] [DR2361] longjmp leaks catched std::runtime_error
2021-09-08 2:19 [Bug c++/102237] New: longjmp leaks catched std::runtime_error david.cortes.rivera at gmail dot com
@ 2021-09-08 2:46 ` pinskia at gcc dot gnu.org
2021-09-08 2:47 ` pinskia at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: pinskia at gcc dot gnu.org @ 2021-09-08 2:46 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102237
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Ever confirmed|0 |1
Last reconfirmed| |2021-09-08
Status|UNCONFIRMED |SUSPENDED
Summary|longjmp leaks catched |[DR2361] longjmp leaks
|std::runtime_error |catched std::runtime_error
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
C++ defect report 2361:
https://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#2361
Still active too so suspending.
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c++/102237] [DR2361] longjmp leaks catched std::runtime_error
2021-09-08 2:19 [Bug c++/102237] New: longjmp leaks catched std::runtime_error david.cortes.rivera at gmail dot com
2021-09-08 2:46 ` [Bug c++/102237] [DR2361] " pinskia at gcc dot gnu.org
@ 2021-09-08 2:47 ` pinskia at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: pinskia at gcc dot gnu.org @ 2021-09-08 2:47 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102237
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
http://wg21.link/cwg2361
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2021-09-08 2:47 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-09-08 2:19 [Bug c++/102237] New: longjmp leaks catched std::runtime_error david.cortes.rivera at gmail dot com
2021-09-08 2:46 ` [Bug c++/102237] [DR2361] " pinskia at gcc dot gnu.org
2021-09-08 2:47 ` pinskia at gcc dot gnu.org
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).