Messages in this thread |  | | Subject | Re: linux hangs with printk on schedule() | From | Robert Love <> | Date | 03 Feb 2003 19:43:52 -0500 |
| |
On Mon, 2003-02-03 at 19:35, Haoqiang Zheng wrote:
> I found Linux hangs when printk is inserted to the function schedule(). > Sure, it doesn't make much sense to add such a line to schedule(). But Linux > shouldn't hang anyway, right? It's assumed that printk can be inserted > safely to anywhere. So, is it a bug of Linux?
Its a known deadlock in 2.4:
schedule -> printk() -> dmesg output -> klogd wakes up -> repeat
It is not a hard fix and its basically one of a few places where you cannot call printk(), which is otherwise a very robust funciton.
Robert Love
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
|  |