On Fri, 26 Mar 2010, John Kacur wrote: > 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. Can you run the following patch please ? Thanks, tglx --- diff --git a/kernel/fork.c b/kernel/fork.c index 340cbc8..b63e8f5 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -1062,7 +1062,9 @@ static struct task_struct *copy_process(unsigned long clone_flags, rt_mutex_init_task(p); #ifdef CONFIG_PROVE_LOCKING - DEBUG_LOCKS_WARN_ON(!p->hardirqs_enabled); + //DEBUG_LOCKS_WARN_ON(!p->hardirqs_enabled); + if (!p->hardirqs_enabled) + print_irqtrace_events(p); DEBUG_LOCKS_WARN_ON(!p->softirqs_enabled); #endif retval = -EAGAIN; -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
