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Date: Fri, 12 Aug 2022 12:25:57 +0100 From: "Sudip Mukherjee (Codethink)" <sudipm.mukherjee@...il.com> To: torvalds@...ux-foundation.org, Jakub Kicinski <kuba@...nel.org> Cc: Marcel Holtmann <marcel@...tmann.org>, Johan Hedberg <johan.hedberg@...il.com>, Luiz Augusto von Dentz <luiz.dentz@...il.com>, "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, linux-bluetooth@...r.kernel.org, netdev@...r.kernel.org, linux-kernel@...r.kernel.org Subject: mainline build failure due to 332f1795ca20 ("Bluetooth: L2CAP: Fix l2cap_global_chan_by_psm regression") Hi All, The latest mainline kernel branch fails to build csky and mips allmodconfig with gcc-12. mips error is: In function 'memcmp', inlined from 'bacmp' at ./include/net/bluetooth/bluetooth.h:347:9, 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:420:16: note: in expansion of macro '__underlying_memcmp' 420 | return __underlying_memcmp(p, q, size); | ^~~~~~~~~~~~~~~~~~~ In function 'memcmp', inlined from 'bacmp' at ./include/net/bluetooth/bluetooth.h:347:9, inlined from 'l2cap_global_chan_by_psm' at net/bluetooth/l2cap_core.c:2004:15: ./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:420:16: note: in expansion of macro '__underlying_memcmp' 420 | return __underlying_memcmp(p, q, size); | ^~~~~~~~~~~~~~~~~~~ csky error is: In file included from net/bluetooth/l2cap_core.c:37: In function 'bacmp', inlined from 'l2cap_global_chan_by_psm' at net/bluetooth/l2cap_core.c:2003:15: ./include/net/bluetooth/bluetooth.h:347:16: error: 'memcmp' specified bound 6 exceeds source size 0 [-Werror=stringop-overread] 347 | return memcmp(ba1, ba2, sizeof(bdaddr_t)); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ In function 'bacmp', inlined from 'l2cap_global_chan_by_psm' at net/bluetooth/l2cap_core.c:2004:15: ./include/net/bluetooth/bluetooth.h:347:16: error: 'memcmp' specified bound 6 exceeds source size 0 [-Werror=stringop-overread] 347 | return memcmp(ba1, ba2, sizeof(bdaddr_t)); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ git bisect pointed to 332f1795ca20 ("Bluetooth: L2CAP: Fix l2cap_global_chan_by_psm regression"). And, reverting that commit has fixed the build failure. Already reported at https://lore.kernel.org/lkml/YvVQEDs75pxSgxjM@debian/ and Jacub is looking at a fix, but this is just my usual build failure mail of mainline branch for Linus's information. -- Regards Sudip
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