<!DOCTYPE html> <html> <head> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body> Dear Kernel-Team, sorry for bothering and contacting you directly. My new AMD64 based computer was running fine with kernel 6.2 since mid of December 2023. The upgrade to 6.5.0-14-generic (10th Jan 2024) ends in it's not booting any more with MCE error messages in a very early stage: <blockquote type="cite"> <pre>[ 1.062769] kernel: mce: [Hardware Error]: Machine check events logged [ 1.062773] kernel: mce: [Hardware Error]: CPU 0: Machine Check: 0 Bank 27: faa000000000080b [ 1.062782] kernel: mce: [Hardware Error]: TSC 0 MISC d012000200000000 SYND 5d000000 IPID 1002e00000500 [ 1.062790] kernel: mce: [Hardware Error]: PROCESSOR 2:a20f12 TIME 1704978569 SOCKET 0 APIC 0 microcode a20120e</pre> </blockquote> Reverting to the 6.2.0-39-generic kernel and these messages vanish completely (no mce errors in dmesg). However, I couldn't find any hint what to do. It seems I'm the only one having this issue at the moment. I posted it to Ubuntuusers Germany. However, it had over 100 reads but no response after two days. <a class="moz-txt-link-freetext" href="https://forum.ubuntuusers.de/topic/mce-hardware-error-nach-kernel-update-6-5-0-14/">https://forum.ubuntuusers.de/topic/mce-hardware-error-nach-kernel-update-6-5-0-14/</a> It seems a similar issue was reported a couple of years ago. The recommendation was to use mcelog to have a look into the machine check logs. Only an old version of this package is available and using this it says it does not know the CPU. <blockquote type="cite"> <pre class="notranslate" style="height: 15em; max-height: none;">System: Kernel: 6.2.0-39-generic x86_64 bits: 64 compiler: N/A Desktop: GNOME 42.9 Distro: Ubuntu 22.04.3 LTS (Jammy Jellyfish) Machine: Type: Desktop System: Micro-Star product: MS-7C56 v: 1.0 serial: <superuser required> Mobo: Micro-Star model: MPG B550 GAMING PLUS (MS-7C56) v: 1.0 serial: <superuser required> UEFI: American Megatrends LLC. v: 1.F0 date: 10/11/2023 CPU: Info: 16-core model: AMD Ryzen 9 5950X bits: 64 type: MT MCP arch: Zen 3 rev: 2 cache: L1: 1024 KiB L2: 8 MiB L3: 64 MiB Speed (MHz): avg: 2518 high: 3400 min/max: 2200/5083 boost: enabled cores: 1: 2200 2: 2200 3: 2200 4: 3400 5: 2200 6: 2200 7: 2200 8: 2879 9: 2200 10: 2200 11: 2879 12: 3400 13: 3400 14: 2200 15: 3400 16: 2200 17: 2200 18: 2200 19: 3400 20: 2200 21: 3400 22: 2200 23: 2913 24: 2200 25: 2200 26: 3122 27: 2200 28: 2200 29: 2200 30: 2200 31: 2200 32: 2200 bogomips: 217596 Flags: avx avx2 ht lm nx pae sse sse2 sse3 sse4_1 sse4_2 sse4a ssse3 svm Graphics: Device-1: NVIDIA vendor: Gigabyte driver: nvidia v: 545.23.08 bus-ID: 2b:00.0 Display: x11 server: X.Org v: 1.21.1.4 driver: X: loaded: nvidia unloaded: fbdev,modesetting,nouveau,vesa gpu: nvidia resolution: 4096x2160~60Hz OpenGL: renderer: NVIDIA GeForce RTX 4060 Ti/PCIe/SSE2 v: 4.6.0 NVIDIA 545.23.08 direct render: Yes</pre> </blockquote> If this problem is of any relevance for the team and if you are about to attend to it, I'm ready to provide any information you are requesting for. Please let me know about your decision. Best regards Karl <pre class="moz-signature" cols="72">-- Karl C. Behler Watzmannring 54 85748 Garching b. München phone +49 89 32679750 mobile +49 1577 4745401</pre> </body> </html>