在2024年7月1日七月 上午2:23，Yu Zhao写道： > On Sun, Jun 30, 2024 at 11:25 AM Jiaxun Yang <jiaxun.yang@xxxxxxxxxxx> wrote: >> >> >> >> 在2024年6月30日六月 上午4:01，Jiaxun Yang写道： >> > 在2024年6月30日六月 上午3:22，Jiaxun Yang写道： >> >> 在2024年6月28日六月 下午6:57，Yu Zhao写道： >> >>> Hi, >> >>> >> >>> OpenWrt folks ran into MCEs caused by multiple matching TLB entries >> >>> [1], after they updated their kernel from v6.1 to v6.6. >> >>> >> >>> I reported similar crashes previously [2], on v6.4. So they asked me >> >>> whether I'm aware of a fix from the mainline, which I am not. >> >>> on >> >>> I took a quick look from the MM's POV and found nothing obviously >> >>> wrong. I'm hoping they have better luck with the MIPS experts. >> >> >> >> Hi Yu, >> >> >> >> I never hit such problem on my (non-bcm) 74Kc systems. >> >> >> >> However a quick glance suggested it may be related to Wired TLB entries >> >> on your platform. >> >> >> >> Both duplicated TLB entries, Index 2 and 3, are all below "Wired" setting, >> >> which means they are not managed by mm, but platform code. >> > >> > I just tried to dig into bcm47xx platform code and I think we should blame >> > bcm47xx_prom_highmem_init, which created wired entry for high mem and may >> > conflict with kernel's mapping. >> > >> > Nowadays, MIPS mm code can handle highmem on it's own, so there is no need >> > to create such entry IMO. >> >> Sorry, I think I made a wrong diagnoses, it's actually a problem in our cache >> alias code. >> >> Will try to fix. > > Thanks for looking into this! So it's a problem incurred by OpenWRT's down stream patch rather than upstream code. This is sorted at: https://github.com/openwrt/openwrt/pull/15635 No further action required :-) Thanks -- - Jiaxun
