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Bug 162886 - Autofs-related kernel panic
Autofs-related kernel panic
Product: Red Hat Enterprise Linux 4
Classification: Red Hat
Component: kernel (Show other bugs)
i686 Linux
medium Severity high
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Assigned To: Jeff Moyer
Brian Brock
Depends On:
  Show dependency treegraph
Reported: 2005-07-11 05:07 EDT by Trond H. Amundsen
Modified: 2007-11-30 17:07 EST (History)
1 user (show)

See Also:
Fixed In Version: kernel-2.6.9-34.EL
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
Last Closed: 2006-04-18 09:22:16 EDT
Type: ---
Regression: ---
Mount Type: ---
Documentation: ---
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Attachments (Terms of Use)
Console messages during panic (7.04 KB, text/plain)
2005-07-11 05:07 EDT, Trond H. Amundsen
no flags Details
/etc/auto.master (5.37 KB, text/plain)
2005-07-25 09:01 EDT, Trond H. Amundsen
no flags Details
Contents of /etc/auto.d/ (17.65 KB, text/plain)
2005-07-25 09:02 EDT, Trond H. Amundsen
no flags Details
Output from mount. (16.71 KB, text/plain)
2005-10-24 09:09 EDT, Trond H. Amundsen
no flags Details

  None (edit)
Description Trond H. Amundsen 2005-07-11 05:07:21 EDT
Description of problem:
Machine panicked during seemingly normal operation, but I can't be sure since
this is a general login server and had ~100 users logged in at the time. The
panic appears to be related to autofs. This particular machine relies heavily on
autofs, mounting several hundreds of filesystems from a large number of NFS
servers around campus, mostly Solaris, HP-UX and Linux. The output (grabbed from
serial console) is attached.

Version-Release number of selected component (if applicable):

How reproducible:
Unknown. It's the first time I've seen this.
Comment 1 Trond H. Amundsen 2005-07-11 05:07:21 EDT
Created attachment 116591 [details]
Console messages during panic
Comment 2 Jeff Moyer 2005-07-22 19:14:22 EDT
Looks like a recursive lookup of some sort.  Is this problem reproducable at all?

Could you please provide the information requested under the section "Filing bug
reports" on the following web page?


Comment 3 Trond H. Amundsen 2005-07-25 09:00:12 EDT
Sure, her it is:

 - autofs version: autofs-4.1.3-131
 - kernel version: 2.6.9-11.ELsmp

I'll attach the contents of auto.master and the maps.

Debug logging with syslog seems to create large files very fast, so I've
disabled that for now. I don't know how to reproduce the panic anyway..
Comment 4 Trond H. Amundsen 2005-07-25 09:01:30 EDT
Created attachment 117118 [details]
Comment 5 Trond H. Amundsen 2005-07-25 09:02:15 EDT
Created attachment 117119 [details]
Contents of /etc/auto.d/
Comment 6 Jeff Moyer 2005-09-15 10:18:17 EDT
This looks very much like a problem that was encountered when doing bind mounts.
 Are there any bind mounts in your setup?  Can you post the output of 'mount'
for your setup?

I have a patch that should address this issue.  Is this easily reproducable?
Comment 7 Jeff Moyer 2005-10-21 11:32:02 EDT
I'm still waiting for answers to the above questions.  Could you provide an
update, please?
Comment 8 Trond H. Amundsen 2005-10-24 09:04:04 EDT
Sorry for the late reply. No, there aren't any bind mounts, and I'll attach the
output from 'mount'. I have seen this problem only once, and have no idea how to
reproduce it, since I don't know what triggered it in the first place.
Comment 9 Trond H. Amundsen 2005-10-24 09:09:15 EDT
Created attachment 120305 [details]
Output from mount.

Note that the autofs setup has been changed slightly since I attached
the autofs maps, as new disks are mounted.
Comment 10 Jeff Moyer 2006-04-17 15:19:10 EDT
Have you seen this problem again?  I really think that it was fixed in kernel
version 2.6.9-22.6.  Without debug logs, I'll be unable to diagnose this
exactly.  Could you at least try the U3 kernel (2.6.9-34.EL) and let me know if
it resolves the problem for you?

Comment 11 Trond H. Amundsen 2006-04-18 08:39:01 EDT
I have not seen the problem again. Only once. But I'll install the latest kernel
anyway and let you know if it happens again. I think it's safe to close this bug
for now. I'll reopen it if I ever see this problem again. Thanks Jeff.
Comment 12 Jeff Moyer 2006-04-18 09:22:16 EDT
OK, thanks!

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