On Mon 2017-02-13 04:18:51, l...@pengaru.com wrote: > On Mon, Feb 13, 2017 at 10:42:36AM +0100, Pavel Machek wrote: > > Hi! > > > > On Mon 2017-02-13 09:48:41, Thomas Gleixner wrote: > > > On Mon, 13 Feb 2017, Pavel Machek wrote: > > > > cd /sys/devices/system/cpu/cpu1 > > > > while true; do echo 0 > online; echo 1 > online; done > > > > > > > > ...crashes x60 with 4.10-rc in few minutes. [Which is bad -- it should > > > > not die, but also good -- this is easier to reproduce then running 100 > > > > suspend cycles.] > > > > > > Can you tell where it crashes? > > > > I did not expect a crash, so I was in X... I have a feeling that this > > will be reproducible on a lot of hardware, but let me try. > > FYI: Lockup reproduced with 4.10.0-rc7 with an X61s. > > Caught a glimpse of something about an RCU stall timeout before the system > shut > off. Prior to that, during the loop execution, a bunch of systemd processes > were experiencing watchdog timeouts, and procps `top` would start but > never refresh, leaving the CPU column all "nan".
Hmm. I was not able to reproduce the lockup when I was running "while
true" over ssh. Some weird stuff happened when I suspended machine
with that loop running, but... I guess that was expected.
Pavel
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