https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89303
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Attachment #45682|0 |1
is obsolete| |
--- Comment #14 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Created attachment 45684
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=45684&action=edit
Testcase for both bugs
This new attachment can be used to reproduce both bugs, for any GCC version
from 5.1.0 onwards, with -O1.
By default it shows the memory leak, but when BAD_WEAK_PTR_BUG is defined it
demonstrates the unexpected exception.
Defining FIXME makes both bugs go away.
I've confirmed that the original bug is caused by
_M_weak_this._M_refcount._M_pi being null:
(gdb) p tg
$1 = {_M_ptr = 0x614e80, _M_refcount = {_M_pi = 0x614e70}}
(gdb) p *tg._M_ptr
$2 = {<std::__enable_shared_from_this<blob, 0>> = {_M_weak_this = {_M_ptr =
0x614e80, _M_refcount = {_M_pi = 0x0}}}, data = 0x614ea0}
Bisecting from 4.9 to 5.1 shows the bug started with r221859:
2015-04-03 Jan Hubicka
PR ipa/65076
* ipa-inline.c (edge_badness): Add combined size to the denominator.
