Re: lockup with voluntary preempt R0 and VP, KP, etc, disabled

[Ingo Molnar]

* Florian Schmidt <mista.tapas@xxxxxxx> wrote:

> [<c0105e29>] do_signal+0x79/0x110
> [<c01162a0>] default_wake_function+0x0/0x20
>   c012fgd7   do_futex+0x47/0xa0
>   c012fb20   sys_futex
>   c0103f07   do_notify
>   c01060e6   work_notifysig
>
> Code: 96 54 01 00 00 8e e0 8e e8 85 d2 74 11 c7 86 54 01 00 00 00 00 00
> 00 89 d0 e8 bb e4 ff 8b 9e 5c 01 00 00 85 db 74 09 8b 45 0c <8b> 40 20
> 48 78 08 8b 5d f8 8b 75 fc c9 c3 c7 86 56 01 00 00 00 
> <6> note: scsynth exited with preempt count 1

it seems the first crash scrolled off and we dont really know what
happened ... Could you apply the attached patch - it will shut the
console off and freeze the box after printing the first oops.

	Ingo
--- linux/arch/i386/kernel/traps.c.orig
+++ linux/arch/i386/kernel/traps.c
@@ -256,6 +256,9 @@ void show_registers(struct pt_regs *regs
 		}
 	}
 	printk("\n");
+	console_silent();
+	for (;;)
+		local_irq_disable();
 }	
 
 static void handle_BUG(struct pt_regs *regs)