Messages in this thread | | | Date | Wed, 3 Jan 2007 22:12:20 -0800 | From | Andrew Morton <> | Subject | Re: VM: Fix nasty and subtle race in shared mmap'ed page writeback |
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On Thu, 04 Jan 2007 17:03:43 +1100 Nick Piggin <nickpiggin@yahoo.com.au> wrote:
> > That bug was introduced in 2.6.19, with the dirty page tracking patches. > > > > 2.6.18 and earlier used ->private_lock coverage in try_to_free_buffers() to > > prevent it. > > Ohh, right you are, I was looking at 2.6.19 sources. The comments above > ttfb match that as well. Curious that the dirty page patches were allowed > to mess with this...
Frankly, those patches scared the crap out of me, specifically because of the delicacy and complexity of the various dirtiness state coherencies. But I just didn't have the bandwidth to go through them with a sufficiently fine toothcomb, sorry.
> Anyway that leaves us with the question of why Andrea's database is getting > corrupted. Hopefully he can give us a minimal test-case.
It'd odd that stories of pre-2.6.19 BerkeleyDB corruption are now coming out of the woodwork. It's the first I've ever heard of them.
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