New: make qemu_x86_64_defconfig stopped working
https://bugs.busybox.net/show_bug.cgi?id=14826
Bug ID: 14826
Summary: make qemu_x86_64_defconfig stopped working
Product: buildroot
Version: 2022.02.2
Hardware: All
OS: Linux
Status: NEW
Severity: normal
Priority: P5
Component: Other
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]Target Milestone: ---
Runnning
make qemu_x86_64_defconfig; make clean all
has stopped working for me. I get the following compilation error:
In file included from sigchain.c:3:
In function 'xrealloc',
inlined from 'sigchain_push.isra' at sigchain.c:26:2:
subcmd-util.h:56:23: error: pointer may be used after 'realloc' [-Werror=use-after-free]
56 | ret = realloc(ptr, size);
| ^~~~~~~~~~~~~~~~~~
subcmd-util.h:52:21: note: call to 'realloc' here
52 | void *ret = realloc(ptr, size);
| ^~~~~~~~~~~~~~~~~~
subcmd-util.h:58:31: error: pointer may be used after 'realloc'
[-Werror=use-after-free]
58 | ret = realloc(ptr, 1);
| ^~~~~~~~~~~~~~~
subcmd-util.h:52:21: note: call to 'realloc' here
52 | void *ret = realloc(ptr, size);
| ^~~~~~~~~~~~~~~~~~
CC scripts/mod/empty.o
HOSTCC scripts/mod/mk_elfconfig
CC scripts/mod/devicetable-offsets.sIn function 'xrealloc',
inlined from 'sigchain_push' at sigchain.c:26:2, inlined from 'sigchain_push_common' at sigchain.c:53:2:
subcmd-util.h:56:23: error: pointer may be used after 'realloc' [-Werror=use-after-free]
56 | ret = realloc(ptr, size);
| ^~~~~~~~~~~~~~~~~~
subcmd-util.h:52:21: note: call to 'realloc' here
52 | void *ret = realloc(ptr, size);
| ^~~~~~~~~~~~~~~~~~
subcmd-util.h:58:31: error: pointer may be used after 'realloc'
[-Werror=use-after-free]
58 | ret = realloc(ptr, 1);
| ^~~~~~~~~~~~~~~
subcmd-util.h:52:21: note: call to 'realloc' here
52 | void *ret = realloc(ptr, size);
| ^~~~~~~~~~~~~~~~~~cc1: all warnings being treated as errors
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[Buildroot] [Bug 14826] make qemu_x86_64_defconfig stopped working
https://bugs.busybox.net/show_bug.cgi?id=14826
Yann E. MORIN <[email protected]> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |[email protected]
--- Comment #1 from Yann E. MORIN <[email protected]> --- Hello,
I am afraid I was not able to reproduce the failure.
From a clean checkout of git master (d590003), I did:
make qemu_x86_64_defconfig
makeAnd the build succeeded.
What version of Buildroot are you using?
What system are you building on?
Regards,
Yann E. MORIN.
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[Buildroot] [Bug 14826] make qemu_x86_64_defconfig stopped working
In reply to [email protected]https://bugs.busybox.net/show_bug.cgi?id=14826
--- Comment #2 from [email protected] ---
I'd say that's good news. I just tried master and it doesn't work either.
A system update just broke something on my end. I'm using Arch on kernel 5.17.9.
Is there a recommended distro to use for building buildroot?
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[Buildroot] [Bug 14826] make qemu_x86_64_defconfig stopped working
In reply to [email protected]https://bugs.busybox.net/show_bug.cgi?id=14826
--- Comment #3 from [email protected] ---
I'd say that's good news. I just tried master and it doesn't work either.
A system update just broke something on my end. I'm using Arch on kernel 5.17.9.
Is there a recommended distro to use for building buildroot?
EDIT: **A system update probably broke something on my end
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[Buildroot] [Bug 14826] make qemu_x86_64_defconfig stopped working
In reply to [email protected]https://bugs.busybox.net/show_bug.cgi?id=14826
--- Comment #4 from Yann E. MORIN <[email protected]> --- Hello,
This issue is caused by a gcc-12 extra check about use-after-free, which has been fixed in the kernel with:
You hit this issue because Archlinux is now using gcc-12.1.0 as the default compiler, and because the kernel uses -Werror to build that host tool.
So, either update your kernel to one that has the fix, or backport it yourself, or downgrade your compiler to a (slightly) older one.
Regards,
Yann E. MORIN.
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[Buildroot] [Bug 14826] make qemu_x86_64_defconfig stopped working
In reply to [email protected]https://bugs.busybox.net/show_bug.cgi?id=14826
Yann E. MORIN <[email protected]> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Assignee|[email protected] |[email protected]
|.org |--- Comment #5 from Yann E. MORIN <[email protected]> --- Created attachment 9316
--> https://bugs.busybox.net/attachment.cgi?id=9316&action=edit
linux: don't build host tools with -Werror
Hello,
Can you please try this patch, and report the result?
If that works for you, I'll submit a proper patch later.
Regards,
Yann E. MORIN.
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[Buildroot] [Bug 14826] make qemu_x86_64_defconfig stopped working
In reply to [email protected]https://bugs.busybox.net/show_bug.cgi?id=14826
--- Comment #6 from [email protected] ---
Thanks for figuring this out! I can confirm that the patch works on master, commit eb5e2d2d43c5c0f71ae8243081625261de2cd134.
Bit of a tangential question: is there an easy way to see what kernel version commit 52a9dab6d892763b2a8334a568bd4e2c1a6fde66 would have made it into?
Thanks again!
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[Buildroot] [Bug 14826] make qemu_x86_64_defconfig stopped working
In reply to [email protected]https://bugs.busybox.net/show_bug.cgi?id=14826
Yann E. MORIN <[email protected]> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED--- Comment #7 from Yann E. MORIN <[email protected]> --- All,
Thanks for the report. We believe this has now been fixed with commit baa55a4e26e6 (linux: disable -Werror when building host tools) that has just been applied to master.
Regards,
Yann E. MORIN.
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