linux-kernel - Re: [PATCH 5.18 0/6] 5.18.19-rc1 review

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Date:   Sat, 20 Aug 2022 11:32:36 +0100
From:   Sudip Mukherjee <sudipm.mukherjee@...il.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel <linux-kernel@...r.kernel.org>,
        Stable <stable@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Shuah Khan <shuah@...nel.org>, patches@...nelci.org,
        lkft-triage@...ts.linaro.org, Pavel Machek <pavel@...x.de>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Florian Fainelli <f.fainelli@...il.com>, slade@...dewatkins.com
Subject: Re: [PATCH 5.18 0/6] 5.18.19-rc1 review

On Sat, Aug 20, 2022 at 11:03 AM Sudip Mukherjee (Codethink)
<sudipm.mukherjee@...il.com> wrote:
>
> Hi Greg,
>
> On Fri, Aug 19, 2022 at 05:40:12PM +0200, Greg Kroah-Hartman wrote:
> > -------------------
> > NOTE, this is the LAST 5.18.y stable release.  This tree will be
> > end-of-life after this one.  Please move to 5.19.y at this point in time
> > or let us know why that is not possible.
> > -------------------
> >
> > This is the start of the stable review cycle for the 5.18.19 release.
> > There are 6 patches in this series, all will be posted as a response
> > to this one.  If anyone has any issues with these being applied, please
> > let me know.
> >
> > Responses should be made by Sun, 21 Aug 2022 15:36:59 +0000.
> > Anything received after that time might be too late.
>

<snip>

>
> powerpc failure is not seen in mainline. Same error as csky and mips.
>
> In function 'memcmp',
>     inlined from 'bacmp' at ./include/net/bluetooth/bluetooth.h:302:9,
>     inlined from 'l2cap_global_chan_by_psm' at net/bluetooth/l2cap_core.c:2002:15:
> ./include/linux/fortify-string.h:44:33: error: '__builtin_memcmp' specified bound 6 exceeds source size 0 [-Werror=stringop-overread]
>    44 | #define __underlying_memcmp     __builtin_memcmp
>       |                                 ^
> ./include/linux/fortify-string.h:404:16: note: in expansion of macro '__underlying_memcmp'
>   404 |         return __underlying_memcmp(p, q, size);
>       |                ^~~~~~~~~~~~~~~~~~~
> In function 'memcmp',
>     inlined from 'bacmp' at ./include/net/bluetooth/bluetooth.h:302:9,
>     inlined from 'l2cap_global_chan_by_psm' at net/bluetooth/l2cap_core.c:2003:15:
> ./include/linux/fortify-string.h:44:33: error: '__builtin_memcmp' specified bound 6 exceeds source size 0 [-Werror=stringop-overread]
>    44 | #define __underlying_memcmp     __builtin_memcmp
>       |                                 ^
> ./include/linux/fortify-string.h:404:16: note: in expansion of macro '__underlying_memcmp'
>   404 |         return __underlying_memcmp(p, q, size);
>       |                ^~~~~~~~~~~~~~~~~~~
>
> I am bisecting now to find out what caused it.

Introduced in v5.18.18 due to 11e008e59970 ("Bluetooth: L2CAP: Fix
l2cap_global_chan_by_psm regression").
But v5.19.y and mainline does not show the build failure as they also
have 41b7a347bf14 ("powerpc: Book3S 64-bit outline-only KASAN
support").


-- 
Regards
Sudip