Messages in this thread | | | Date | Fri, 05 Dec 2014 10:03:10 -0500 | From | Sasha Levin <> | Subject | Re: frequent lockups in 3.18rc4 |
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On 12/05/2014 01:38 AM, Linus Torvalds wrote: > On Thu, Dec 4, 2014 at 9:00 PM, Sasha Levin <sasha.levin@oracle.com> 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!
Thanks, Sasha
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