Bug 590923 - /sbin/mkdumprd spins forever doing "readlink"
Summary: /sbin/mkdumprd spins forever doing "readlink"
Alias: None
Product: Fedora
Classification: Fedora
Component: kexec-tools   
(Show other bugs)
Version: 13
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Neil Horman
QA Contact: Fedora Extras Quality Assurance
Depends On:
TreeView+ depends on / blocked
Reported: 2010-05-11 00:12 UTC by Roland McGrath
Modified: 2010-05-13 19:26 UTC (History)
1 user (show)

Fixed In Version: kexec-tools-2.0.0-35.fc13
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
Last Closed: 2010-05-13 19:26:32 UTC
Type: ---
Regression: ---
Mount Type: ---
Documentation: ---
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Attachments (Terms of Use)
-x log (11.58 KB, text/plain)
2010-05-11 16:24 UTC, Roland McGrath
no flags Details
patch to fix how we sift through sysfs (725 bytes, patch)
2010-05-12 15:40 UTC, Neil Horman
no flags Details | Diff
updated patch (865 bytes, patch)
2010-05-12 18:46 UTC, Neil Horman
no flags Details | Diff

Description Roland McGrath 2010-05-11 00:12:28 UTC
Description of problem:

First noticed during boot with kexec-tools installed,
also happens with manual "service kexec-tools start".
It spins forever chewing CPU.
I found that running /sbin/mkdumprd is where it happens and doing this by hand hits it too.

I've attached the log of running "bash -x /sbin/mkdumprd ..." where it eventually runs "readlink /sys/class/block/sda5" repeatedly forever.

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

How reproducible:

Steps to Reproduce:
Actual results:

Expected results:

Additional info:

Comment 1 Neil Horman 2010-05-11 11:10:33 UTC
could you attach that file please?  thanks !

Comment 2 Roland McGrath 2010-05-11 16:24:25 UTC
Created attachment 413187 [details]
-x log

Oops, thought I'd attached it in the initial report.

Comment 3 Neil Horman 2010-05-12 15:40:26 UTC
Created attachment 413462 [details]
patch to fix how we sift through sysfs

looks like I forgot to port a RHEL patch over to Fedora.  Let me know if this fixes your problem.  Thanks!

Comment 4 Roland McGrath 2010-05-12 18:11:39 UTC
With that, the infinite loop is instead:

++ readlink ./device

Comment 5 Neil Horman 2010-05-12 18:46:55 UTC
Created attachment 413521 [details]
updated patch

sorry, missed a hunk from the backport.

Comment 6 Roland McGrath 2010-05-12 19:26:33 UTC
That fixes mkdumprd I guess.  It completed.  But "service kdump start" is not happy.  It just says "FAILED" with no details.  syslog gets:

May 12 12:25:46 magilla kdump: No crashkernel parameter specified for running kernel
May 12 12:25:46 magilla kdump: failed to start up

Comment 7 Neil Horman 2010-05-12 19:28:32 UTC
It told you exactly what the problem was:

"No crashkernel parameter specified for running

you need to specify a crashkernel command line parameter on the kernel command line.  For x86 system crashkernel=128M is usually sufficient.

I'll commit this change shortly.  Thanks!

Comment 8 Roland McGrath 2010-05-12 19:37:47 UTC
I'm using what you get out of the box for booting F-13 with kexec-tools installed.  I don't want to fiddle kernel parameters by hand.  Either it should just work, or it should not be chkconfig on by default.

Comment 9 Fedora Update System 2010-05-12 20:10:54 UTC
kexec-tools-2.0.0-35.fc13 has been submitted as an update for Fedora 13.

Comment 10 Fedora Update System 2010-05-13 19:26:27 UTC
kexec-tools-2.0.0-35.fc13 has been pushed to the Fedora 13 stable repository.  If problems still persist, please make note of it in this bug report.

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