linux-kernel - [BUG-REPORT][PREEMPT-RT] 2.6.33.1-rt11 triggers DEBUG_LOCKS_WARN_ON(!p->hardirqs

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Date:	Fri, 26 Mar 2010 13:02:22 +0100
From:	John Kacur <jkacur@...hat.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	RT <linux-rt-users@...r.kernel.org>
Subject: [BUG-REPORT][PREEMPT-RT] 2.6.33.1-rt11 triggers DEBUG_LOCKS_WARN_ON(!p->hardirqs_enabled), 
	in a 32-bit kvm session

During boot-up of 2.6.33.1-rt11 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 2.6.33.1-rt11 #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.

Thanks
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