linux-kernel - Re: [PATCH v5 2/2] RISC-V: Setup initial page tables in two stages

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Date:   Thu, 15 Aug 2019 13:29:21 -0700 (PDT)
From:   Paul Walmsley <paul.walmsley@...ive.com>
To:     Alistair Francis <Alistair.Francis@....com>,
        David Abdurachmanov <david.abdurachmanov@...il.com>
cc:     Anup Patel <Anup.Patel@....com>,
        "aou@...s.berkeley.edu" <aou@...s.berkeley.edu>,
        "palmer@...ive.com" <palmer@...ive.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "rppt@...ux.ibm.com" <rppt@...ux.ibm.com>,
        "hch@...radead.org" <hch@...radead.org>,
        Atish Patra <Atish.Patra@....com>,
        "linux-riscv@...ts.infradead.org" <linux-riscv@...ts.infradead.org>
Subject: Re: [PATCH v5 2/2] RISC-V: Setup initial page tables in two stages

On Thu, 15 Aug 2019, David Abdurachmanov wrote:

> Yes, I do see those in Fedora/RISCV build farm every morning, but with
> riscv64 and 5.2.0-rc7 kernel.

[...]

> fedora-riscv-4 login: [178876.406122] Unable to handle kernel paging
> request at virtual address 0000000000012a28
> fedora-riscv-7 login: [17983.074847] Unable to handle kernel paging
> request at virtual address 0fffffdff5e14700

Alistair, you're seeing panics immediately after the userspace transition, 
right?  100% of the time?

If so, this is probably a different bug.  Most likely the TLB flushing 
issue.


- Paul