Hi Aron, On Tue, Feb 07, 2023 at 03:53:27PM +0800, Aron Xu wrote: > Hi, > I'm not sure which version of Loongson CPU you are using, anyway these > are several of them: Architecture: mips64 Byte Order: Little Endian CPU(s): 4 On-line CPU(s) list: 0-3 Thread(s) per core: 1 Core(s) per socket: 4 Socket(s): 1 NUMA node(s): 1 Model: ICT Loongson-3 V0.1 FPU V0.1 BogoMIPS: 3592.19 L1d cache: 256 KiB L1i cache: 256 KiB L2 cache: 2 MiB NUMA node0 CPU(s): 0-3 Flags: vz msa loongson-mmi loongson-cam loongson-ext loongson-ext2 > 1. madd.X/msub.X: they are fused implementations while others are > non-fused, disabled by default in Debian > 2. EI/DI: only affect privileged mode so that the kernel needs to be > compiled with mips64r1 (which I believe it is default upstream) > 3. swxc1: would report illegal hardware instruction on some hardware, > and some octean boards will report SIGBUS > 4. FR0 FPU emulation mode is not architecturally valid, but this does > not likely affect you since you are not using mips32r1/r2. I have seen the list of "fpu failing packages not for loongson" in the wanna-build codebase and while rebuilding stretch packages i also experienced various fpu based issues. glibc basically fails all idouble and ifloat tests which i disabled. Also i see reproducible kernel issues when building "racket". The machine starts dying afterwards slowly and needs a reboot. I tried a 6.1 and its even worse - e.g. when reproducing it the machine was unusable pretty fast. [215283.122039] BUG: Bad page map in process raco pte:480001a05 pmd:98000001258cc000 [215283.129621] page:00000000c5d1cb6c refcount:-9669 mapcount:-9670 mapping:0000000000000000 index:0x0 pfn:0x48000 [215283.139713] flags: 0x1201000000000() [215283.143366] raw: 0001201000000000 0000000000000100 0000000000000122 0000000000000000 [215283.151181] raw: 0000000000000000 0000000000000000 ffffda3bffffda39 0000000000000000 [215283.158999] page dumped because: bad pte [215283.163015] addr:0000000062938000 vm_flags:00100077 anon_vma:98000003a2f25728 mapping:0000000000000000 index:18a4e [215283.173432] file:(null) fault:0x0 mmap:0x0 readpage:0x0 [215283.178734] CPU: 2 PID: 2478154 Comm: raco Tainted: G B E 5.10.0-20-loongson-3 #1 Debian 5.10.158-2 [215283.188949] Hardware name: Lemote LEMOTE-LS3A4000-7A1000-1w-V0.1-pc/LEMOTE-LS3A4000-7A1000-1w-V01-pc, BIOS Kunlun-A1901-V4.1.4 04/2 0/2020 So i am digging whether this is something broken in kernel, fpu etc. Flo -- Florian Lohoff f@zz.de Any sufficiently advanced technology is indistinguishable from magic.
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