Re: linux-2.5.40 64GB highmem BUG()

From: Adam J. Richter (adam@yggdrasil.com)
Date: Sat Dec 21 2002 - 04:43:20 EST


>> Although 2.5.40 has been out for a while, I think I ought
>> to post this bug as I haven't seen any other mention of it.
>> When I boot an 2.5.40 x86 kernel built with CONFIG_HIGHMEM64G,
>> and with a 920kB initial ramdisk (2.2MB uncompressed), I get a kernel
>> BUG() at highmem.c line 480, preceded by a message saying "scheduling
>> with KM_TYPE 15 held!" The machine on which I experienced this
>> problem has 1.25GB of RAM. The problem occurs with and without
>> CONFIG_PREEMPT. All kernels that tried were SMP kernels running on a
>> uniprocessor.

>This is not reproducible here with 2.5.52-mm2. Is the initrd required
>to trigger this?

        Yes, the initrd seems to be required. It happens when
the initrd attempts to mount /proc (it runs a shell script that
starts by setting PATH, mounting /dev, and mounting /proc).

        I've verified that under 2.5.52 the problem occurs with
CONFIG_HIGHME64G and not with CONFIG_HIGHMEM4G. Actually, now the
problem is a BUG() at slab.c:1451, which is also memory corruption,
and I suspect just an evolution of the same problem from 2.5.40.

        Anyhow, in case it helps you, I've put the vmlinux and initrd
that produce this problem in
ftp://ftp.yggdrasil.com/private/adam/for-wli/. Note that the ramdisk
has kernel modules that don't match the kernel but that's not the
issue, as I configured that kernel to have a different version name.

       Thanks for your attention to this problem.

Adam J. Richter __ ______________ 575 Oroville Road
adam@yggdrasil.com \ / Milpitas, California 95035
+1 408 309-6081 | g g d r a s i l United States of America
                         "Free Software For The Rest Of Us."
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