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    SubjectRe: [PATCH 6/6] drm/i915: Fix lock order reversal in GEM relocation entry copying. -- makes X hang
    Hi!

    On Wed, 25 Mar 2009 14:45:10 -0700
    Eric Anholt <eric@anholt.net> wrote:

    > Signed-off-by: Eric Anholt <eric@anholt.net>
    > Reviewed-by: Keith Packard <keithp@keithp.com>
    > ---
    > drivers/gpu/drm/i915/i915_gem.c | 187
    > +++++++++++++++++++++++++++----------- 1 files changed, 133
    > insertions(+), 54 deletions(-)
    >

    I testet Linus' Git tree @ 5d80f8e5a (merge
    net-2.6) and discovered that X hung after starting up gdm.

    When i start gdm the screen is frozen and X hangs.
    I was able to bisect it down to

    40a5f0decdf050785ebd62b36ad48c869ee4b384 drm/i915: Fix lock order
    reversal in GEM relocation entry copying.


    when hung /proc/[xpid]/stack did contain:

    [<ffffffff8024c13e>] msleep_interruptible+0x2e/0x40
    [<ffffffff80557fdd>] i915_wait_ring+0x17d/0x1d0
    [<ffffffff8056280d>] i915_gem_execbuffer+0xd2d/0xf70
    [<ffffffff80546555>] drm_ioctl+0x1f5/0x320
    [<ffffffff802d8ce5>] vfs_ioctl+0x85/0xa0
    [<ffffffff802d8f0b>] do_vfs_ioctl+0x20b/0x510
    [<ffffffff802d9297>] sys_ioctl+0x87/0xa0
    [<ffffffff8020ba8b>] system_call_fastpath+0x16/0x1b
    [<ffffffffffffffff>] 0xffffffffffffffff


    I reverted that commit now on top of 5d80f8e5a and all 's well .


    My X-Stack is from Git at around 20th march. I will update that now,
    but as it hangs in a kernel syscall, it shouldn't matter?

    Sincerely,

    Florian

    p.s. no kms

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