I believe this is the same issue as https://github.com/pmodels/mpich/issues/5309. While we are resolving it, you could try the patch mentioned in the issue, or configure with ch4 using the latest release. -- Hui Zhou From: Fabrice Ducos via discuss <[email protected]> Date: Wednesday, June 16, 2021 at 3:54 AM To: [email protected] <[email protected]> Cc: Fabrice Ducos <[email protected]> Subject: [mpich-discuss] the MPI daemon triggers an assertion on an ARM-based Linux system Greetings, when running an application (atmospheric science) with MPICH on an AWS ARM (not x86) instance (with Linux Ubuntu Server 20.04), our process crashes at the end of the processing. MPICH was installed precompiled with the Ubuntu apt provisioning tool: $ sudo apt install -y mpich $ apt list [only relevant lines displayed for brevity] libmpich-dev/focal,now 3.3.2-2build1 arm64 [residual-config] libmpich12/focal,now 3.3.2-2build1 arm64 [installed,auto-removable] mpich-doc/focal 3.3.2-2build1 all mpich/focal 3.3.2-2build1 arm64 Luckily, we got some debug information in mpid that can be valuable: Assertion failed in file src/mpid/ch3/channels/nemesis/src/ch3_progress.c at line 530: payload_len >= sizeof (MPIDI_CH3_Pkt_t) 0xffff86833f5f ??? ???:0 0xffff86881eef ??? ???:0 0xffff8683793f ??? ???:0 0xffff8686c543 ??? ???:0 0xffff8676d4b3 ??? ???:0 0xffff8637e6eb ??? ???:0 0xffff8637e85b ??? ???:0 0xffff86369093 ??? ???:0 0xaaaac5491e6f ??? ???:0 internal ABORT - process 22 The same application has been used for years with several MPI implementations (MPICH, OpenMPI, Intel MPI) on x86 systems without problem. It was successfully tested with MPICH on Linux Ubuntu Server 20.04 x86 shortly alongside the ARM test. We also tested the application with another MPI implementation (namely, OpenMPI) on the same ARM instance and it did work. We are perfectly fine using another MPI implementation in this specific case, but we thought that this issue would be of some interest to the MPICH maintenance team. Best regards Fabrice Ducos Ingénieur d’études CNRS Laboratoire d’Optique Atmosphérique - UMR CNRS 8518 Faculté des Sciences et Technologies Bâtiment P5 - Bureau 325 Université de Lille - Cité Scientifique 59655 Villeneuve d’Ascq