[Bug 633227] [NEW] instabilities with highmem activated

[Sebastien JAN]

Public bug reported:

Seen on Maverick: 2.6.35-903.9
HW: pandaboard ES2.0

Using following kernel memory allocation (in bootargs):
mem=460M at 0x80000000 mem=512M at 0xA0000000

Instabilities have been observed in 2 different ways:

1) The following memtester test:
sudo memtester -p 0xb0000000 120
Fails in few seconds with a "illegal instruction” error.
Then various behaviors can be seen:  the UI can freeze, shell commands be unavailable. The systems works well again after a reboot.

2) By doing a native build of a kernel package (with file-system on SD card, and kernel sources on an NFS mount):
After 15mins to 1h30, a "compiler error: bus error" triggers and the build stops (and the platform hangs).


This issue cannot be reproduced if using mem=460M at 0x80000000 mem=256M at 0xA000000.
This issue cannot be reproduced with highmen deactivated from the kernel config.
This issue can be reproduced with 'nosmp' in kernel command line.

** Affects: linux-ti-omap4 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: armel

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instabilities with highmem activated
https://bugs.launchpad.net/bugs/633227
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