Re: frequent lockups in 3.18rc4

From: Sasha Levin
Date: Fri Dec 05 2014 - 10:03:35 EST

On 12/05/2014 01:38 AM, Linus Torvalds wrote:
> On Thu, Dec 4, 2014 at 9:00 PM, Sasha Levin <sasha.levin@xxxxxxxxxx> wrote:
>> >
>> > Just to add to this: I've enabled the simplest level of verbosity in the fault
>> > injection options, and RCU stalls are again easy to trigger:
> Where do you log to?
> In particular, do you have some serial line logging enabled (perhaps
> even without anybody listening)? Or network logging?
> We've definitely had cases where logging itself is so slow that it
> triggers watchdogs etc. Logging to a serial line can take for*ever* in
> modern terms..

Yes, it's going to a serial line, but it's only about 100 lines/second on
average. I wouldn't expect it to cause anything to hang!

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