Messages in this thread | | | Subject | Re: kswapd hung tasks in 2.6.38-rc1 | From | Dave Hansen <> | Date | Mon, 31 Jan 2011 14:40:16 -0800 |
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On Mon, 2011-01-31 at 12:58 -0800, Dave Hansen wrote: > On Thu, 2011-01-20 at 03:55 -0500, CAI Qian wrote: > > When running LTP oom01 [1] testing, the allocation process stopped > > processing right after starting to swap. > > I'm seeing the same stuff, but on -rc2. I thought it was > transparent-hugepage-related, but I don't see much of a trace of it in > the stack dumps. > > http://sr71.net/~dave/ibm/config-v2.6.38-rc2 > > It happened to me as well around the time that things started to hit > swap.
Still not a very good data point, but I ran a heavy swap load for an hour or so without reproducing this. But, it happened again after I enabled transparent huge pages. I managed to get a sysrq-t dump out of it:
http://sr71.net/~dave/ibm/2.6.38-rc2-hang-0.txt
khugepaged is one of the three running tasks. Note, I set both its sleep timeouts to zero to stress it out a bit.
I'll keep trying to reproduce without THP.
-- Dave
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