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Description of problem:
After running bonnie++ for longer time in loop the kernel starts to report I/O errors on disk or panics.

Version-Release number of selected component (if applicable):
 2.4.21-35.EL, 2.4.21-32.0.1.EL and kernel-2.4.21-27.EL

How reproducible:
Sometimes

Steps to Reproduce:
1.run bonnie++ and wait for few hours

  

Actual Results:  I/O errors on disk or kernel panic

Expected Results:  system should run...

Additional info:

Host, OS info:
--------------
Dell PE 2850, 2xXeon, 12GB RAM, 1xPERC 4i/DC (1logical drive raid 10, scsi1, sdb), 1xPERC 4e/DC (1logical drive raid 10, scsi0, sda), 1xQLA2312 (no drives attached, scsi2)
BIOS A2

RedHat Enterprise Linux ES 3 U5 x86_64, latest updates

DELL PERC drivers:
megaraid2-v2.10.10.1-1dkms
dkms-2.0.5-1

Kernel from RHEL ES Beta:
kernel-2.4.21-35.EL

Filesystems: ext3, no sw raid, no lvm

reproducible: yes
After running 1 or 2 bonnie++ (one on sda, one on sdb) the kernel crashed after few hours of benchmarking in loop
I also tried kernels 2.4.21-35.EL, 2.4.21-32.0.1.EL and kernel-2.4.21-27.EL withe default megaraid2 from RH
Running bonnie++ on RH driver causes scsi I/O errors after some time of test.
Other symptoms:
It mmight happen that throuput for writing goes down to 100blocks/sec (according to iostat) even if there are many dirty buffers to be written, bonnie than takes more than night to finish. Reading from this disk (dd if=/dev/sda1) at the same time seems to improve write performance again.