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 > >> >> Thanks >> - Jiaxun >> >>> >>> Thanks! >>> >>> [1] https://github.com/openwrt/openwrt/pull/15635 >>> [2] >>> https://lore.kernel.org/linux-mm/CAOUHufbAjZd4Mxkio9OGct-TZ=L0QRG+_6Xa7atQVFN_4ez86w@xxxxxxxxxxxxxx/ >>> >> -- >> - Jiaxun > > -- > - Jiaxun -- - Jiaxun
