| 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> |
| Severity: | high | Docs Contact: | |
| Priority: | high | ||
| Version: | 3.0 | CC: | petrides, riel |
| Target Milestone: | --- | ||
| Target Release: | --- | ||
| Hardware: | i686 | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2004-10-20 21:21:37 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | ||
Please include information about the hardware being used, as well as information about whether or not it happens on multiple machines. 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. 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 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 Gunther, whats the status of this bug? I havent seen any update in the last 3 months. Larry Closing due to lack of activity. If there is additional information, please reopen and provide the information. |
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: