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b=Gx25TPM0IQQuJ6Jt9Y43E/IQ6dVfolSgn1TdiB0fleynDN7oPw4YRKYboFKtHg0NQ EEX2jrLsp9v7+TlvUug+fBMqZzhfA83Cq+U5WQmeChknJ8ifPDPeSHFC2vPHKut2UZ Oi5FQmgTR3oHER0N/FVFX/uzLCzJWNlEVEBk5HWg04NUwj8iVsiv0pPd/GKgED8J+J fAzQaSFMzQfJRQGSIjIIR5aKOVyEbltgSQ0S6UrTEvqyMalGkxVwPmGllSBpk3iu5u WHMes8RO1gPlhZ941IvwOV5zoYeCQFQZyhmvNwqornTBtjS24uPtHpDWfPaJ93zjRF bXnBuiQdQYHNA== Message-ID: Date: Tue, 11 Aug 2026 06:58:57 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [BUG] powerpc: userspace processes crash in ld64.so.2 when running recent linux-next kernels To: Venkat Rao Bagalkote , Madhavan Srinivasan , Ritesh Harjani , linuxppc-dev , ajd@linux.ibm.com Cc: LKML , Christian Brauner , "linux-mm@kvack.org" References: <75419f88-eab9-444b-bf97-28a9765819ad@linux.ibm.com> <627c5c2f-a0b3-4fba-811f-7b4ed4c74dbb@linux.ibm.com> Content-Language: fr-FR From: "Christophe Leroy (CS GROUP)" In-Reply-To: <627c5c2f-a0b3-4fba-811f-7b4ed4c74dbb@linux.ibm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam07 X-Rspam-User: X-Stat-Signature: bhdx58rpi5g9izmtiqfqxz51f7cfzo99 X-Rspamd-Queue-Id: C3006100007 X-HE-Tag: 1786424344-136918 X-HE-Meta: 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 hvIcNIuu 8+QCsqTPcApLFvH430G9RLtW0wjLA31XT5/u9Yq+3rqIXI+BYwc50LwuUHvhXagsKuxr1USshldxTFhvPDO0f75OVc7ZYLq4jE+Jxozi6feIVTWHuqBg4fYBsojYxm8/vmOzJAxIMqh4F8y258oMndrXKpswzh4z2W0YvCDmHHBFdHzpf4WWx55f7cEvmmyiRwifM+7DdhCbd5g30Mnf2fS3ywmjXVyHjJXsCyb6uJ+LjBd2Nmr+zfqF7eCrlLP4tQr0Di6Osyzg6KwsM2dqA4yzQUcObRDtYlH4tuxljM+/WZfd0IYRiL4hY5bmK3x9xiQRt Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Le 11/08/2026 à 06:23, Venkat Rao Bagalkote a écrit : > > As part of debugging and suggested by Maddy, I reverted the following > commit: > >   263e5159e00a ("powerpc: Fix exit_flags field placement in pt_regs for > ptrace") > > and rebuilt/booted linux-next with only that change reverted. > > After booting the reverted kernel, I rebuilt the latest upstream kernel > using the same userspace and toolchain. The build completed > successfully and I did not observe any of the ld64.so.2 userspace > segfaults that were previously seen during kernel compilation. > > Kernel used for testing: > >   7.2.0-rc5-next-20260731-00001-g79d9c1ce90a9 > > Top of tree: > >   commit 79d9c1ce90a9873422ca4d6d0124a1d1c10a098c >   Revert "powerpc: Fix exit_flags field placement in pt_regs for ptrace" > > The upstream kernel build completed successfully: > >   INSTALL /lib/modules/7.2.0-rc7/kernel/net/openvswitch/vport-gre.ko >   DEPMOD  /lib/modules/7.2.0-rc7 >   INSTALL /boot > > Based on this testing, reverting commit 263e5159e00a appears to > eliminate the random userspace crashes observed during kernel builds, > suggesting that the issue may be related to that change. But commit 263e5159e00a fixes commit d7a6797e0bc1 ("powerpc: add exit_flags field in pt_regs"), by reverting commit 263e5159e00a you re-introduce other bugs. It's a bit difficult to see what commit 263e5159e00a is doing exactly, most of it is a revert of commit d7a6797e0bc1 but it does something instead. Need to see what remains with both commits applied. Christophe