Bug 173135
Summary: | user-space processes freeze under moderate to heavy load | ||
---|---|---|---|
Product: | Red Hat Enterprise Linux 3 | Reporter: | strovato |
Component: | kernel | Assignee: | Larry Woodman <lwoodman> |
Status: | CLOSED DUPLICATE | QA Contact: | Brian Brock <bbrock> |
Severity: | high | Docs Contact: | |
Priority: | medium | ||
Version: | 3.0 | CC: | moixa, petrides, sct |
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: | 2006-01-23 14:46:44 UTC | Type: | --- |
Regression: | --- | Mount Type: | --- |
Documentation: | --- | CRM: | |
Verified Versions: | Category: | --- | |
oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
Cloudforms Team: | --- | Target Upstream Version: | |
Embargoed: | |||
Attachments: |
Description
strovato
2005-11-14 15:24:56 UTC
Created attachment 121021 [details]
CPU flag dump from Alt+SysRq+P, with tail-end of vmstat output
Created attachment 121022 [details]
Memory dump from Alt+SysRq+M
Created attachment 121023 [details]
Task dump from Alt+SysRq+T
This is the first I have heard about this problem. You said that it is not reproducable yet it happens??? Can you get the full AltSysrq-W and AltSysrq-T outputs from /var/log/messages so I can see what is happening when the system freezes? Thanks, Larry Woodman I did not know about AltSysRq-W; I'll try to get that information the next time the freeze occurs. None of the Alt-SysRq output goes to the syslog because it is dead by that point. Is there another way I can capture the output to these commands since it scrolls off the screen? Thanks! -S OK, can you try to set up a serial console so that you can capture the necessary debuging information? Also, exactly how reproducable is this problem? Larry Woodman I will do as you suggest and work to set up a serial console. The problem is not reproducible "on demand." I basically have to wait for it to freeze and hopefully be in a position to capture the necessary information before the watchdog resets the machine. It usually freezes about once a week, so I may not be able to post more info until then. OK and please make sure this is the latest RHEL3-U6 kernel. Larry OK, it froze again, and I was able to retrieve the data you requested. I will attach it below. (I am using the latest RHEL3-U6 kernel.) -S Created attachment 121353 [details]
output from Alt+SysRq+P, M, W, T, & P again, all in one document
output from Alt+SysRq+P, M, W, T, & P again, all in one document, obtained from
the serial console during a freeze situation
Could this be another deadlock scenario, as discussed in bug #122077 ? The symptoms are identical, and there are plenty of references to dquot in the SysRq dumps I just posted. I also ran across this thread: https://listman.redhat.com/archives/ext3-users/2003-November/msg00024.html which included a patch for another ext3/quota deadlock scenario, but it doesn't seem to be incorporated into my kernel source tree (stock RHEL3). -S OK, I think this bug is a duplicate of bug #122252. I applied the kernel patch that was posted there and have not had any freezes since then. My uptime is the highest it's ever been since the bug started manifesting itself, so I think it's safe to say this is the fix but will keep an eye on it. This bug is very old, and the patch was posted a year ago. Is there a technical reason why this has not been included in a Red Hat kernel update? -S *** This bug has been marked as a duplicate of 122252 *** |