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SubjectRe: 2.4 SRMMU bug revisited
On Mon, 2002-05-27 at 04:24, Tomas Szepe wrote:

> I finally got round to trying the patches out and --
> unfortunately, things got even worse. While before the machine would
> oops (still allowing one to ssh in and reboot) under heavy loads, now
> it doesn't bother to log the slightest notice that something might
> have broken, and freezes entirely (it can be pinged, though).
> I can't say I like these fixes much.
> T.

What kinds of heavy loads? If you were triggering the out of nocache
memory BUG, then this patch may help. I fixes a bug where fork fails and
calls destroy_context on the parent's mm or more precisely a memcpy'd
duplicate of it. In that case when fork returns to the parent, it
continuously faults.

But if your load does not fork heavily, then this is probably not the


--- 2.4.19-pre4/kernel/fork.c Thu Mar 28 19:49:36 2002
+++ tortoise-19-pre4/kernel/fork.c Sun Apr 21 22:01:18 2002
@@ -336,6 +336,9 @@
if (!mm_init(mm))
goto fail_nomem;

+ if (init_new_context(tsk,mm))
+ goto free_pt;
retval = dup_mmap(mm);
@@ -347,9 +350,6 @@
* child gets a private LDT (if there was an LDT in the parent)
copy_segments(tsk, mm);
- if (init_new_context(tsk,mm))
- goto free_pt;

tsk->mm = mm;
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