|Summary:||kernel hangs or crashes when hugetbl is on and Oracle 10g uses it|
|Product:||Red Hat Enterprise Linux 3||Reporter:||Gunther Schadow <ebiz>|
|Component:||kernel||Assignee:||Larry Woodman <lwoodman>|
|Status:||CLOSED NOTABUG||QA Contact:||Brian Brock <bbrock>|
|Fixed In Version:||Doc Type:||Bug Fix|
|Doc Text:||Story Points:||---|
|Last Closed:||2004-10-20 21:21:37 UTC||Type:||---|
|oVirt Team:||---||RHEL 7.3 requirements from Atomic Host:|
Description Gunther Schadow 2004-02-24 19:04:48 UTC
Description of problem: On a system with 20GB ram running the RHEL3 hugemem kernel and hugetbl_max set to 8192 (which strangely enough /proc/meminfo reports as being just 4096 pages, and it looks like meminfo is right) when I run Oracle 10g using lots of memory the kernel suddenly panics or just simply locks up. Version-Release number of selected component (if applicable): How reproducible: Happens every other time I start Oracle (with a configuration that really uses lots of memory) Steps to Reproduce: 1. Install Oracle 10g 2. modify oracle to lower-mapped-base specs (optional) 3. modify oracle to enable aio (optional) 4. echo 8192 > /proc/sys/kern/hugetbl_max 5. specify sga_max_size = 3500M 6. specify db_buffer_cache = 2000M --> of course I don't expect you to do all this, just to debug a kernel error. I would make a program that actually allocates lots of hugetbl shared memory and uses it heavily. Actual results: system crashes/hangs Expected results: system runs happily :-) Additional info:
Comment 1 Suzanne Hillman 2004-02-26 22:21:29 UTC
Please include information about the hardware being used, as well as information about whether or not it happens on multiple machines.
Comment 2 Gunther Schadow 2004-03-04 01:51:13 UTC
Hardware is a ProLiant DL780 (?) or so, it's got 4 CPUs. I can't tell whether it happens on multiple machines. What I do know is that when it actually panics and I get to see the dump output, it does mumble something about hugetbl stuff.
Comment 3 Larry Woodman 2004-04-05 15:50:33 UTC
Can you please get several "AltSysrq M" outputs when the system is hung while running 10g with hugltlb pages? I cant reproduce this problem locally. Thanks, Larry Woodman
Comment 4 Larry Woodman 2004-04-20 15:04:17 UTC
Please try to reproduce this problem with the latest RHEL3-U2 kernel (2.4.21-14.EL). We found and fixed a problem which sounds exactly like this one in that kernel. Larry Woodman
Comment 5 Larry Woodman 2004-08-02 21:07:49 UTC
Gunther, whats the status of this bug? I havent seen any update in the last 3 months. Larry
Comment 6 Suzanne Hillman 2004-10-20 21:21:37 UTC
Closing due to lack of activity. If there is additional information, please reopen and provide the information.