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    SubjectRe: Freezing bug in all kernels greater than 2.4.5-ac13 *AND* 2.4.6-pre2

    On Wed, 27 Jun 2001 wrote:

    > I decided, for the hell of it, to test the pre series as I've been
    > nudged by many people to try it in favor of the ac kernel series that
    > I've been having problems with. Well, it turns out I have ran into
    > exactly the same problem I had with the ac kernel series, which quite
    > frankly is surprising the hell out of me.
    > To make the kernel freeze/slow down to a crawl with affected kernels on
    > my machine I do this test:
    > Load X (This fills up my ram and causes me to swap a bit)
    > run a rxvt and su to root (proboably unnecessary)
    > du /
    > Now, somewhere in this test I start swapping a little bit, nothing
    > big... then BAM. hard disk, mouse, keyboard, all completely and utterly
    > stop. Video continues to work, but my cpu's load goes absolutely INSANE.
    > (If it recovers, gkrellm generally says I've gotten a loadavg somewhere
    > between 3-20, depending on how long it was stuck) This can last for
    > seconds (usually) minutes (once) or it can simply get worse and hang the
    > machine (many, many many times)
    > When it recovers from this, I generally see a MASSIVE write to swap,
    > (I'm using gkrellm to monitor it) and the system continues on as if
    > nothing happened - until, of course, this happens again. A kernel
    > compile can cause it. a rm -R of a large directory can cause it. Loading
    > a large application can cause it.
    > On some kernels this is more noticable than others - ac15 does it the
    > worst, although pre3 rivals it, and the symptoms are different on
    > ac17/18 - it'll simply freeze randomly and with no recovery instead of
    > sometimes freezing or sometimes slowing down to a crawl and recovering
    > or freezing. (Which is worse? You decide.)
    > Now, as before, I tested this with swap and without swap. With swap, I
    > get the hangs/freezes in all the affected kernels. Without swap, I
    > don't. Nada.
    > Now, the big question of the day folks: What changed between 2.4.6-pre2
    > and 2.4.6-pre3 that ALSO changed between 2.4.5-ac13 and 2.4.5-ac14 - and
    > now, what part of those patches were the VM? Anyone? I don't see in
    > 2.4.6-pre3 what changed that was part of the VM... So I am trying to
    > narrow it down a bit :)
    > This bug is driving me slightly nuts, so I want it dead. Anyone got a
    > exterminator handy? =)

    Rik's page_launder() changes.

    > Refer to my previous post with this subject for my original description
    > of this problem. It's still there in ac18, though I've not tested 19
    > (Some have said it's not likely to have been fixed, and I've been
    > regress testing 2.4.6pre's today.)
    > Subject: Possible freezing bug located after ac13
    > Let me know if I can provide any additional information that will help
    > nail this bug to the wall. (I want to torture it. =)

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