linux-kernel - threadirqs and kthreadd

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Message-ID: <CAFxy--b+j86kn6Ttc+qTTi4chDkKbrmSAxEsS7_CnzuabJAZfQ@mail.gmail.com>
Date:	Sat, 18 Oct 2014 16:41:26 +0530
From:	ajay kanala <ajaykanala321@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: threadirqs and kthreadd_task

Hi,
I have been trying to enable "threadirqs" command line option on
3.10.12 kernel and kernel crashes with NULL pointer access for
kthreadd_task in wake_up_process function:

[    0.000000] Call Trace:
[    0.000000] [<8005544c>] wake_up_process+0xc/0x48
[    0.000000] [<8004c1b8>] kthread_create_on_node+0x64/0xc4
[    0.000000] [<8006d338>] __setup_irq+0x130/0x634
[    0.000000] [<8006d89c>] setup_irq+0x60/0xb4
[    0.000000] [<8050267c>] icu_of_init+0x1f8/0x2f8
[    0.000000] [<80517b30>] of_irq_init+0x2c8/0x304
[    0.000000] [<805007bc>] start_kernel+0x218/0x3a4

But as far as i see, kthreadd_task is initialized in start_kernel -->
rest_init function which is much later than setting up interrupts (
init_IRQ ):

So my question is, how are systems working which enabled "threadirqs"
command line option enabled ( the code flow seems similar even on 3.17
kernel ). Am i missing the obvious?

thanks for pointers

-- Ajay
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