linux-kernel - Re: [linux-next] mm/i915: i915_gemfs

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Message-ID: <CA+icZUXh068m8UFeHDXCKDi0YfL2Z=WoONy7J7DJLqAT1CZ+rQ@mail.gmail.com>
Date:   Wed, 24 Jul 2019 20:44:39 +0200
From:   Sedat Dilek <sedat.dilek@...il.com>
To:     Daniel Vetter <daniel@...ll.ch>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Cc:     Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        David Airlie <airlied@...ux.ie>,
        Hugh Dickins <hughd@...gle.com>,
        David Howells <dhowells@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, intel-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org, linux-mm@...ck.org
Subject: Re: [linux-next] mm/i915: i915_gemfs_init() NULL dereference

Hi Daniel, Hi Sergey,

I observed the same call-trace since next-20190712 with i195-gfx.

First thought this is a problem with clang-9/ld-lld-9, but turned out
to be a different objtool problem.

The same call-trace I saw with gcc-8 from Debian/buster.

This is with clang-9 (prerelease) and ld.bfd (I switched the linker).

My kernel-log and dmesg-log are attached.

If you need more informations or already have a fix baked up, please
let me know.

Thanks.

Regards,
- Sedat -

[1] https://github.com/ClangBuiltLinux/linux/issues/617
[2] https://lore.kernel.org/patchwork/patch/1103984/

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