On Tue, Aug 21, 2012 at 06:33:45PM -0700, Hugh Dickins wrote:
> Jeff,
>
> Your commit 91f68c89d8f3 ("block: fix infinite loop in __getblk_slow"),
> already gone into 3.* stable, is not good. Could you and your testers
> please give this alternative a try - I think it should work, and have
> started it on a few days' memory load on 3.5, but not tried your case.
I'll try your patch later today, but the test is very simple:
- Create a 1024 byte empty (all zeroes) partition and then try to mount it.
Failure was that the mount command would go into an infinite loop
using 100% CPU. Success is that it gives an error.
More about it here including a very simple libguestfs script to
reproduce it:
https://bugzilla.redhat.com/show_bug.cgi?id=835019#c0
and a virtual disk image that also demonstrates the problem without
needing anything except a VM running the test kernel:
https://bugzilla.redhat.com/show_bug.cgi?id=835019#c1
Rich.
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