Messages in this thread | | | Date | Tue, 27 Jul 2004 15:58:59 -0300 | From | Marcelo Tosatti <> | Subject | Re: "swap_free: Unused swap offset entry 00000100" but no crash? |
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On Tue, Jul 27, 2004 at 07:53:04AM -0500, Robin Holt wrote: > On Tue, Jul 27, 2004 at 10:30:02PM +1000, Keith Owens wrote: > > On Tue, 27 Jul 2004 02:21:54 +0200, > > Marcin Owsiany <marcin@owsiany.pl> wrote: > > > kernel: swap_free: Unused swap offset entry 00000100 > > >Also, I would be grateful if someone could explain what is that number in the > > >message supposed to be? An address? > > > > It is a swap partition number, but I doubt that you have 256 swap > > partitions in your system. Single bit set in a word that is meant to > > be 0, most likely to be caused by a hardware single bit error. Run > > memtest, burn86 or other memory verification checks. > > > > I remember a race condition I thought was possible, but couldn't exactly > pin down the exact sequence. Give me a chance to dig through some of > my notes and see what I come across.
Would love to hear more details about this.
> I think I could understand this if there two messages with each invocation, > but not with one. > > Marcin, you have a process with a Page Table Entry which indicates it is > pointing to a page which has been swapped out to block 0 of swap device > 256. This is probably caused by a problem in the kernel. You can certainly > run memtest et al. If you don't find anything, I would assume the problem > is in the kernel.
Marcin, please run the memtest86 and report back.
> Most of the code in the area you would be affected by has changed > drastically in the 2.6 kernel.
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