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Thu, 27 Aug 2026 14:16:20 +0000 (GMT) Received: from [9.67.92.114] (unknown [9.67.92.114]) by smtpav05.fra02v.mail.ibm.com (Postfix) with ESMTP; Thu, 27 Aug 2026 14:16:20 +0000 (GMT) Message-ID: Date: Thu, 27 Aug 2026 19:46:18 +0530 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: powerpc: userspace processes crash on abort() from libc.so.6 To: Shrikanth Hegde , linuxppc-dev , tglx@kernel.org Cc: linux-kernel@vger.kernel.org, maddy@linux.ibm.com, christophe.leroy@csgroup.eu, riteshh@linux.ibm.com References: Content-Language: en-US From: Shivaprasad G Bhat In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Spam-Info: AW1haW4tMjYwODI3MDExOCBTYWx0ZWRfX5OrKWeDBh5AK caYK8a9HkZ8MSg7TxO1WDqe+QE+3fgNIeSi1yhceIFJBDN7OxjGfi0QPzua7dlyHaJVGxPXt6r4 mHwUwhjPXztKAbGJsR3X9Y5VqUmg7M8= X-Authority-Analysis: v=2.4 cv=AYuB2XXG c=1 sm=1 tr=0 ts=6a9046bc cx=c_pps a=AfN7/Ok6k8XGzOShvHwTGQ==:117 a=AfN7/Ok6k8XGzOShvHwTGQ==:17 a=IkcTkHD0fZMA:10 a=Sv0fKeRqtYgA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=RzCfie-kr_QcCd8fBx8p:22 a=NEAV23lmAAAA:8 a=VwQbUJbxAAAA:8 a=pGLkceISAAAA:8 a=pnlxZmXi8QIVzasWyfMA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 X-Proofpoint-ORIG-GUID: A4KgM3yLy7F_mvNhXEZ2ZmrpIZ3EIgL6 X-Proofpoint-GUID: A4KgM3yLy7F_mvNhXEZ2ZmrpIZ3EIgL6 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODI3MDExOCBTYWx0ZWRfXwsr9uiKhzBsw Yd3txQv3UExoUhd0S9PryQ8fVxy4OIk3uDHQjna+2JmOWZw34LmmJ92DtVjwgo9xpMLFyg1JLV+ GGsihZ84G+pBCCMgHa3/wLW8xrYhmjgc6qF6kxfbP/5R9Vy+o09yCJ4QSuL613YJUI+huAJI4qH wDk3bPKCejT+A6LsRv8K679XFmNPCkcvFXBhDH8p97to1PboZH+UDp3CextRj+gFha8jSTtLQMl PXuZOZZtgNskozJkHG1LF3enDhni75f3hx/ebGXR8eiH7nqpQR+eD51X6K90aVh+yUEX6SJcbcz mFNYx3hAyRvj1nRxUub9+QmbxjcdvwyD8/4v9UUkkNnyg1hbGJMVj9a04BCZTMjz791rzz5YRrE VKYrEvtR3cEPB2zr85MtIZIB30bILj6gIKKoASRjUU/ed8yfmBnojZ36x8DemytkBzW3voGjpZf Fq1T0zs/eW6MqAGWEbA== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-08-27_05,2026-08-26_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 phishscore=0 clxscore=1015 adultscore=0 bulkscore=0 impostorscore=0 priorityscore=1501 lowpriorityscore=0 spamscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608270118 Hi Shrikanth, On 8/27/26 5:08 PM, Shrikanth Hegde wrote: > Hi Shivaprasad. > > On 8/27/26 11:13 AM, Shivaprasad G Bhat wrote: >> >> Hi All, Thomas, >> >> On my PPC64 machine, I see the below systemd crash orginating from >> abort() during boot on top of the tree. Complete dmesg can be seen >> here [1] >>        abort (libc.so.6 + 0x29484) >>        __libc_message_impl (libc.so.6 + 0x9e00c) >>        __libc_fatal (libc.so.6 + 0x9e06c) >>        start_thread (libc.so.6 + 0xadffc) >>        __clone (libc.so.6 + 0x152d68) >>        __clone (libc.so.6 + 0x152d68) >>        create_thread.constprop.0 (libc.so.6 + 0xad9c8) >> >> The git bisect pointed me to commit 3424d8c18a7da "(Merge tag 'core- >> entry-2026-08-17' of git://git.kernel.org/pub/scm/linux/kernel/git/ >> tip/tip)" >> >> Please find the kernel config used to build the kernel at [2]. >> >> I have tried applying the pending fixes from Mukesh [3] and Ritesh [4] >> for the currently outstanding issues and still see the problem. >> >> The system is running Fedora 42, with glibc-2.41-7.fc42.ppc64le. The >> complete list of toolchain and packages can be found here [5] >> >> Thanks and Regards, >> Shivaprasad >> >> References: >> 1 - https://gist.github.com/ >> shivaprasadbhat/6f166374bab12b4f4c1cd4ac829e562c >> 2 - https://gist.github.com/shivaprasadbhat/ >> aa499468e124015eec5932fb13e88e05 >> 3 - https://lore.kernel.org/linuxppc-dev/ >> lda1jyut.ritesh.list@gmail.com/#t >> 4 - https://lore.kernel.org/linuxppc-dev/20260820134718.2176411-1- >> mkchauras@gmail.com/ >> 5 - https://gist.github.com/shivaprasadbhat/ >> ae56ca849c3009e8642a6313dc465ea7 >> >> ========= >> Backtrace from dmesg: >> [   22.039343][ T1833] systemd-coredump[1833]: Module libsystemd- >> shared-257.6-1.fc42.so from rpm systemd-257.6-1.fc42.ppc64le >> [   22.039378][ T1833] systemd-coredump[1833]: Stack trace of thread >> 1828: >> [   22.039378][ T1833] systemd-coredump[1833]: Stack trace of thread >> 1828: >> [   22.039401][ T1833] systemd-coredump[1833]: #0  0x00007fffa4c29484 >> abort (libc.so.6 + 0x29484) >> [   22.039401][ T1833] systemd-coredump[1833]: #0  0x00007fffa4c29484 >> abort (libc.so.6 + 0x29484) >> [   22.039429][ T1833] systemd-coredump[1833]: #1  0x00007fffa4c9e00c >> __libc_message_impl (libc.so.6 + 0x9e00c) >> [   22.039429][ T1833] systemd-coredump[1833]: #1  0x00007fffa4c9e00c >> __libc_message_impl (libc.so.6 + 0x9e00c) >> [   22.039461][ T1833] systemd-coredump[1833]: #2  0x00007fffa4c9e06c >> __libc_fatal (libc.so.6 + 0x9e06c) >> [   22.039461][ T1833] systemd-coredump[1833]: #2  0x00007fffa4c9e06c >> __libc_fatal (libc.so.6 + 0x9e06c) >> [   22.039491][ T1833] systemd-coredump[1833]: #3  0x00007fffa4cadffc >> start_thread (libc.so.6 + 0xadffc) >> [   22.039491][ T1833] systemd-coredump[1833]: #3  0x00007fffa4cadffc >> start_thread (libc.so.6 + 0xadffc) >> [   22.039521][ T1833] systemd-coredump[1833]: #4  0x00007fffa4d52d68 >> __clone (libc.so.6 + 0x152d68) >> [   22.039521][ T1833] systemd-coredump[1833]: #4  0x00007fffa4d52d68 >> __clone (libc.so.6 + 0x152d68) >> [   22.039551][ T1833] systemd-coredump[1833]: #5  0x00007fffa4d52d68 >> __clone (libc.so.6 + 0x152d68) >> [   22.039551][ T1833] systemd-coredump[1833]: #5  0x00007fffa4d52d68 >> __clone (libc.so.6 + 0x152d68) >> [   22.039580][ T1833] systemd-coredump[1833]: #6  0x00007fffa4cad9c8 >> create_thread.constprop.0 (libc.so.6 + 0xad9c8) >> [   22.039580][ T1833] systemd-coredump[1833]: #6  0x00007fffa4cad9c8 >> create_thread.constprop.0 (libc.so.6 + 0xad9c8) >> [   22.039614][ T1833] systemd-coredump[1833]: #7  0x00000000003af858 >> n/a (n/a + 0x0) >> [   22.039614][ T1833] systemd-coredump[1833]: #7  0x00000000003af858 >> n/a (n/a + 0x0) >> [   22.039639][ T1833] systemd-coredump[1833]: ELF object binary >> architecture: PowerPC64 >> [   22.039639][ T1833] systemd-coredump[1833]: ELF object binary >> architecture: PowerPC64 >> [   22.042109][    T1] systemd[1]: systemd-journald.service: Scheduled >> restart job, restart counter is at 1. > > I was looking at merge patch and It is possible that TIF_SYSCALL_RET is > still set when it is returned > and maybe causing a mismatch. > > Does below help? > --- > > --- a/arch/powerpc/kernel/syscall.c > +++ b/arch/powerpc/kernel/syscall.c > @@ -19,8 +19,10 @@ notrace long system_call_exception(struct pt_regs > *regs, unsigned long r0) >      long ret; >      syscall_fn f; > > -    if (unlikely(!syscall_enter_from_user_mode_randomize_stack(regs, > &r0))) > +    if (unlikely(!syscall_enter_from_user_mode_randomize_stack(regs, > &r0))) { > +        clear_thread_flag(TIF_SYSCALL_RET); Yes. This worked. Thanks, Shivaprasad>          return syscall_get_error(current, regs); > +    } > >      if (unlikely(test_and_clear_thread_flag(TIF_SYSCALL_RET))) >          return syscall_get_error(current, regs);