[CentOS] swapper: page allocation failure. order:1, mode:0x20

Tony Molloy tony.molloy at ul.ie
Fri Oct 19 12:16:10 EDT 2012


On Friday 19 October 2012 15:27:52 m.roth at 5-cent.us wrote:
> Tim Nelson wrote:
> > ----- Original Message -----
> >
> >> On Thursday 18 October 2012 21:44:30 Tim Nelson wrote:
> >> > I see this ocasionally on one of my CentOS 6.3 x64 systems:
> >> >
> >> > Oct 18 03:10:52 backup kernel: swapper: page allocation
> >> > failure. order:1, mode:0x20 Oct 18 03:10:52 backup kernel:
> >> > Pid: 0, comm: swapper Not tainted 2.6.32-279.9.1.el6.x86_64 #1
> >> > Oct 18 03:10:52 backup kernel: Call Trace:
> >> > Oct 18 03:10:52 backup kernel: <IRQ>  [<ffffffff8112789f>] ?
> >> >  __alloc_pages_nodemask+0x77f/0x940 Oct 18 03:10:52 backup
> >> > kernel:
> >>
> >> <snip>
> >>
> >> > Any thoughts on the cause? The system has 16GB of RAM, and
> >> > whenever checked, there is no swap usage. Is this a memory
> >> > error (bad RAM)?
> >>
> >> I have the same problem on a Dell PE R720 with 16GB of RAM doing
> >> lots of networking. It's a file server. It was discussed on the
> >> dell-poweredge mailing list last week
> >> <linux-poweredge at dell.com>
> >>
> >> The conclusion was that it was harmless but for a discussion and
> >> possible workaround see
> >> <https://bugzilla.redhat.com/show_bug.cgi?id=770545#c16>
> >>
> >> Hope this helps,
> 
> Thanks, but I agree with the person in the bugzilla thread, this is
>  not "just harmless" - when I see one in the logs, I usually see
>  several within a single hour. I *think* that it seems to happen
>  more when someone's copying or d/l large datasets, and it makes me
>  extrememly worried about the consistency of the data.


Agree it happens when there is a lot of network activity. My box 
during the day is a student fileserver and at night it does backups 
using BackupPC so a lot of network activity. I haven't seen any
ill-effects but would obviously be happy to get it sorted. I tried the 
workaround suggested in the bugzilla thread so I'll see if it has any 
effect.

Tony
> 
>        mark
> 
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