openjdk 20 crash on linux 5.19.9

[Ze Zhang]

java -version will crash on linux 5.19.9

but 5.15 will be ok

[Palmer Dabbelt]

There's an issue with large VAs that is causing issues for a handful of userspace stacks (Go and OpenJDK).  If your kernel and implementation supports these, as newer QEMU and Linux do, then you'll see crashes.  There's some fixes in the works but I don't think anything has been posted yet.

That's all I know of, the OpenJDK port list is probably the best place to ask.

On Mon, Nov 21, 2022, 8:39 PM Ze Zhang <zhangz...@gmail.com> wrote:

java -version will crash on linux 5.19.9

but 5.15 will be ok

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[Ze Zhang]

I found kernel 5.19.9 defaults to PGTABLE_LEVELS = 5, but openjdk 20 only support SV48, 

so I should change qemu 7.10 to SV48, (QEMU 7.10 defaults to SV57).

[atish patra]

On Mon, Nov 21, 2022 at 11:44 PM Ze Zhang <zhangz...@gmail.com> wrote:

I found kernel 5.19.9 defaults to PGTABLE_LEVELS = 5, but openjdk 20 only support SV48, 

so I should change qemu 7.10 to SV48, (QEMU 7.10 defaults to SV57).

Here is the qemu patch that allows user to specify the mmu mode

https://patchew.org/QEMU/20221117072841.2...@rivosinc.com/

 

Here is the hackish patch from ubuntu repo to force kernel to sv48

https://patchwork.ozlabs.org/project/ubuntu-kernel/patch/20221010112729.42522-...@canonical.com/

There will be an official patch in the kernel to address this as well.

在2022年11月22日星期二 UTC+8 12:45:29<pal...@dabbelt.com> 写道：

There's an issue with large VAs that is causing issues for a handful of userspace stacks (Go and OpenJDK).  If your kernel and implementation supports these, as newer QEMU and Linux do, then you'll see crashes.  There's some fixes in the works but I don't think anything has been posted yet.

That's all I know of, the OpenJDK port list is probably the best place to ask.

On Mon, Nov 21, 2022, 8:39 PM Ze Zhang <zhangz...@gmail.com> wrote:

java -version will crash on linux 5.19.9

but 5.15 will be ok

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Regards,

Atish

[Michael Zoran]

I've been playing with a fpga based riscv that can run linux and I'm finding that performance isn't that affected by the page table depth.  Perhaps Sv57 really should be the default for most systems and maybe openjdk could be improved?

[Michael Zoran]

Have any patches been submitted on this?

[Tommy Murphy]

As Palmer suggested earlier, probably best to follow up here?

https://mail.openjdk.org/pipermail/riscv-port-dev/2022-November/000681.html