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    SubjectRe: [BUG] "sched: Remove rq->lock from the first half of ttwu()" locks up on ARM
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    On Thu, 2011-05-26 at 18:09 +0200, Peter Zijlstra wrote:
    > On Thu, 2011-05-26 at 17:59 +0200, Peter Zijlstra wrote:
    > > On Thu, 2011-05-26 at 17:45 +0200, Oleg Nesterov wrote:
    > > > Stupid question. Can't we fix this problem if we do
    > > >
    > > > - if (p == current)
    > > > + if (cpu == raw_smp_processor_id())
    > > >
    > > > ?
    > > >
    > > > I forgot the rules... but iirc task_cpu(p) can't be changed under us?
    > >
    > > Easy enough to test.. brain gave out again,. hold on ;-)
    >
    > The below seems to run all-right so far, I'll let it run for a while.

    Just got the following:

    INFO: task kjournald:904 blocked for more than 120 seconds.
    "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
    kjournald D c0284c88 0 904 2 0x00000000
    [<c0284c88>] (schedule+0x54c/0x620) from [<c0284dd8>] (io_schedule+0x7c/0xac)
    [<c0284dd8>] (io_schedule+0x7c/0xac) from [<c00dc1c0>] (sleep_on_buffer+0x8/0x10)
    [<c00dc1c0>] (sleep_on_buffer+0x8/0x10) from [<c02854ac>] (__wait_on_bit+0x54/0x9c)
    [<c02854ac>] (__wait_on_bit+0x54/0x9c) from [<c028556c>] (out_of_line_wait_on_bit+0x78/0x84)
    [<c028556c>] (out_of_line_wait_on_bit+0x78/0x84) from [<c014bc4c>] (journal_commit_transaction+0x734/0x13f4)
    [<c014bc4c>] (journal_commit_transaction+0x734/0x13f4) from [<c014f598>] (kjournald+0xb8/0x210)
    [<c014f598>] (kjournald+0xb8/0x210) from [<c0066320>] (kthread+0x80/0x88)
    [<c0066320>] (kthread+0x80/0x88) from [<c002ea14>] (kernel_thread_exit+0x0/0x8)

    M.
    --
    Reality is an implementation detail.




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