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From: "yinyuefengyi at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug ipa/107769] [12/13 Regression] -flto with -Os/-O2/-O3 emitted code with gcc 12.x segfaults via mutated global in .rodata since r12-2887-ga6da2cddcf0e959d
Date: Thu, 30 Mar 2023 03:35:08 +0000 [thread overview]
Message-ID: <bug-107769-4-jRtKjrRKBT@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-107769-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107769
Xionghu Luo (luoxhu at gcc dot gnu.org) <yinyuefengyi at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |yinyuefengyi at gmail dot com
--- Comment #5 from Xionghu Luo (luoxhu at gcc dot gnu.org) <yinyuefengyi at gmail dot com> ---
For case c#1:
g__r_1 is a global variable changed in function hh, but ipa-prop think it is
only loaded by reference without change then removed references in
gcc/ipa-prop.cc:propagate_controlled_uses.
.wpa.081i.cp:
g__r_1/6 (g__r_1)
Type: variable definition analyzed
Visibility: semantic_interposition prevailing_def_ironly
References:
Referring: main/7 (addr) kk.constprop.0/16 (addr) kk.part.0.constprop.0/17
(read)
Read from file: /tmp/cc3peQfe.o
Availability: available
Varpool flags: initialized
.wpa.085i.inline:
ipa-prop: Address IPA constant will reach a load so adding LOAD reference from
main/7 to g__r_1/6.
ipa-prop: Removed a reference from main/7 to g__r_1/6.
ipa-prop: Removing cloning-created reference from kk.constprop/16 to g__r_1/6.
...
g__r_1/6 (g__r_1)
Type: variable definition analyzed
Visibility: semantic_interposition prevailing_def_ironly
References:
Referring: main/7 (read) main/7 (read) kk.part.0.constprop.0/17 (read)
Read from file: /tmp/cc3peQfe.o
Availability: available
Varpool flags: initialized
It seems a bug exposed by r12-2887-ga6da2cddcf0e959d, but maybe actually caused
by r12-2523-g13586172d0b70c since it fail to identify globals not read-only...
next prev parent reply other threads:[~2023-03-30 3:35 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-20 15:54 [Bug c/107769] New: -flto with -Os/-O2/-O3 emitted code with gcc 12.x segfaults via mutated global in .rodata resence at parsoma dot net
2022-11-20 18:23 ` [Bug ipa/107769] [12/13 Regression] " pinskia at gcc dot gnu.org
2022-11-21 8:45 ` [Bug ipa/107769] [12/13 Regression] -flto with -Os/-O2/-O3 emitted code with gcc 12.x segfaults via mutated global in .rodata since r12-2887-ga6da2cddcf0e959d marxin at gcc dot gnu.org
2022-11-21 10:29 ` hubicka at gcc dot gnu.org
2022-11-22 8:33 ` rguenth at gcc dot gnu.org
2023-03-24 13:51 ` jamborm at gcc dot gnu.org
2023-03-30 3:35 ` yinyuefengyi at gmail dot com [this message]
2023-03-31 11:09 ` jamborm at gcc dot gnu.org
2023-04-06 17:01 ` jamborm at gcc dot gnu.org
2023-04-17 11:06 ` cvs-commit at gcc dot gnu.org
2023-04-17 14:17 ` [Bug ipa/107769] [12 " jamborm at gcc dot gnu.org
2023-04-26 16:45 ` cvs-commit at gcc dot gnu.org
2023-04-26 16:46 ` jamborm at gcc dot gnu.org
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