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Thu, 27 Aug 2026 11:38:32 +0000 (GMT) Received: from [9.39.21.111] (unknown [9.39.21.111]) by smtpav02.fra02v.mail.ibm.com (Postfix) with ESMTP; Thu, 27 Aug 2026 11:38:31 +0000 (GMT) Message-ID: Date: Thu, 27 Aug 2026 17:08:31 +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: Shivaprasad G Bhat , 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: Shrikanth Hegde In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: UyLBrmhSsgjsiKkj1IdvrlYbjGq-MIWB X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODI3MDA5NiBTYWx0ZWRfXwF7a8D2C1emA KtAsLiapJz9YsWw+2M72hSE8QVLLkdas2bjulNliRHjVL+l+tDJJ5MRrPtBHLxip48GrVjoR+PL bamN/j5bOqeHoA38m4Hq69Wd1VM+2/EgCQ3Uny3imEgYLgKseM3JgFAMvNLluLvf7LyUhFV5ZHZ RgtIh7AULaPn4B7OyX+Xd/b3QsXeP2vSZdK6AgxnzOUfi3sqCjaspwrWb6DGn0OrMAjTXoZ1gmQ S8rwq482gP+E+LuGJJSMQvFCLf6gul+IVvlxKlvMequvPDmxvwdjkjqNWnZC5SF2MIF6VdF+wuw W6BY1Ovs7nxu0ASAKntHXOVGnt7sVV+NzhqBSznSeiBdJGI/JZpf7Nb1TpC2c1v1KiuaTz8gfCz td+7wcCwvi4ggdqzIB7VvQV/YYHiga108V+XdV5qHKKaoXZXdGIOPaNCxoEX7N2n7wBbw+J2pku nwOcYY52Kep2wzDZlBA== X-Authority-Analysis: v=2.4 cv=Y/nIdBeN c=1 sm=1 tr=0 ts=6a9021c3 cx=c_pps a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17 a=IkcTkHD0fZMA:10 a=Sv0fKeRqtYgA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=iQ6ETzBq9ecOQQE5vZCe:22 a=NEAV23lmAAAA:8 a=VwQbUJbxAAAA:8 a=pGLkceISAAAA:8 a=dz-O3gLL9ZW_plmJqncA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 X-Proofpoint-Spam-Info: AW1haW4tMjYwODI3MDA5NiBTYWx0ZWRfXwMPuG7lrZ6US GaryvuelSVHgKG6bGyWs3QlxD4D7F8hoV/49pjqAsbHt+EaUCa3AWHDfiz4qHR4ev6hC214wi/F j8iwEjdeuHHM+/RIsYk1NQlPvqOjp9E= X-Proofpoint-ORIG-GUID: UyLBrmhSsgjsiKkj1IdvrlYbjGq-MIWB 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_04,2026-08-26_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 impostorscore=0 priorityscore=1501 adultscore=0 bulkscore=0 suspectscore=0 malwarescore=0 clxscore=1015 lowpriorityscore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608270096 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); return syscall_get_error(current, regs); + } if (unlikely(test_and_clear_thread_flag(TIF_SYSCALL_RET))) return syscall_get_error(current, regs);