From: John Kacur on
During boot-up of in a 32-bit qemu-kvm machine,
The following warning is reliably (every time) triggered.

------------[ cut here ]------------
WARNING: at /home/jkacur/jk-2.6/kernel/fork.c:1065 copy_process+0x299/0x160f()
Hardware name:
Modules linked in:
Pid: 64, comm: khelper Not tainted #1
Call Trace:
[<c104961a>] warn_slowpath_common+0x83/0x9a
[<c1049643>] warn_slowpath_null+0x12/0x15
[<c1046f89>] copy_process+0x299/0x160f
[<c1048711>] do_fork+0x235/0x4e2
[<c107da08>] ? register_lock_class+0x17/0x22d
[<c107e6dc>] ? mark_lock+0x1e/0x1c0
[<c1064a2f>] ? ____call_usermodehelper+0x0/0x138
[<c100ae09>] kernel_thread+0x79/0x81
[<c1064a2f>] ? ____call_usermodehelper+0x0/0x138
[<c100391c>] ? kernel_thread_helper+0x0/0x10
[<c1064cc7>] __call_usermodehelper+0x75/0xa0
[<c10673b6>] worker_thread+0x1f6/0x2fb
[<c1067374>] ? worker_thread+0x1b4/0x2fb
[<c1064c52>] ? __call_usermodehelper+0x0/0xa0
[<c106a91e>] ? autoremove_wake_function+0x0/0x46
[<c106a740>] kthread+0x6b/0x74
[<c10671c0>] ? worker_thread+0x0/0x2fb
[<c106a6d5>] ? kthread+0x0/0x74
[<c106a6d5>] ? kthread+0x0/0x74
[<c1003922>] kernel_thread_helper+0x6/0x10
---[ end trace a22d306b065d4a66 ]---

I am happy to provide more information to help debug this.

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