#asahi-gpu on 2023-08-01 — irc logs at oftc.irclog.whitequark.org

2022-12-21 00:46 ChanServ changed the topic of #asahi-gpu to: Asahi Linux GPU development (no user support, NO binary reversing) | Keep things on topic | GitHub: https://alx.sh/g | Wiki: https://alx.sh/w | Logs: https://alx.sh/l/asahi-gpu

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10:33 <_jannau__> the Firefox crashes mps saw are probably caused by CONFIG_PER_VMA_LOCK=y and thus unrelated to the one I saw

10:33 <_jannau__> that explains the difference frequency. it is 1 in x days for me

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10:47 <marcan> https://lore.kernel.org/linux-mm/CAJuCfpH4HyAVO0fVYKGR9xhZJu19Ek_dTMEBiCCSbOjkDxXD=w@mail.gmail.com/T/

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10:51 <_jannau__> yes, I assumed it's well known that it is broken. I thought it wouldn't be a problem for arm64 since the default in make oldconfig was PER_VMA_LOCK=n

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11:07 <marcan> so then we just have that rare Mesa UAF thing then

11:07 <marcan> nobody's ever seen kernel lockups since the latest update right?

11:08 <marcan> well that and the canberra thing I guess

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11:56 <alyssa> _jannau__: fwiw https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/24412

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12:27 <jannau> argh, I can't read. CONFIG_PER_VMA_LOCK is not user selectable. I must have mixed it up with CONFIG_PER_VMA_LOCK_STATS

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12:28 <jannau> at least that means we (most likely) do not have a use-after-free in mesa

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13:06 <marcan> wait, you think that option triggered the Mesa UAF from the kernel?

13:07 <marcan> that would be fun

13:11 <jannau> not necessarily use-after-free but random memory corruption

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13:12 <jannau> my understandig was that the buggy PER_VMA_LOCK causes random user space memory corruption

13:19 <marcan> oof, heh

13:19 <marcan> that could explain basically any random problem, including the canberra stuff

13:21 <alyssa> omg, thanks guys

13:22 <alyssa> now whenever I have memory corruption in Mesa, now I know it can't possibly be the fault of my C code and I can blame the kernel

13:22 <alyssa> sweet!

13:22 <alyssa> =D

13:22 <jannau> I've only noticed firefox and kate crashes

13:22 <alyssa> :P

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13:41 <alyssa> jannau: by decree of mareko, this is a mesa/st bug and not a driver bug

13:41 <alyssa> so https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/21685 is what we need after all

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22:17 <jannau> lol, macOS just flashed a full magenta display on shutdown

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23:38 <jannau> lina: mac studio m1 ultra has 'afr-perf-states' in the 13.5 ADT but no "apple,afr-opp" property in the linux devicetree