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Description of problem:
Request for upstream commit 3664847d95e6 to be merged into RHEL 7.5/7.4. This patch was recently added to latest -rc by Linus under commit 12fcf66e74b1.
md/raid5: fix a race condition in stripe batch
https://github.com/torvalds/linux/commit/3664847d95e60a9a943858b7800f8484669740fc
There have been reports of RHEL 7 systems crashing due to this bug in large environments when using Lustre. Testing with the mentioned patch indicates that it fixes the issue.
Version-Release number of selected component (if applicable):
kernel-3.10.0-693.2.2.el7
Actual results:
System crash
Expected results:
No crash
Hi Nigel,
While others might be able to test, we had to put our new hardware into production very recently, so while I was able to test last week, we're not in a position of testing anymore. :/
We have servers connected to multiple JBODs and using mdraid. I applied the patch to 7.4 myself and it's working fine now. We're using the patch for more than a month now, maybe even 6 weeks. We had about 1 or 2 kernel panics per week without the patch (in 7.3 and 7.4). The tiny patch fixes a race condition that is well explained by the MD kernel maintainer. I hope you'll still be considering it for RH 7.4/7.5. Sorry of not behind more helpful right now but I prefer to be honest with you. :)
Thanks for your help!
Stephane
This was fixed in RHEL7.5 with the following commit ID by me.
commit 4f386c203da33195fa5ac0379aebec7ab1948e2e
Author: Nigel Croxon <ncroxon>
Date: Thu Nov 2 19:14:22 2017 -0400
-Nigel
Comment 23guazhang@redhat.com
2018-01-19 06:45:00 UTC
Hello
Did code review and verified patches applied correctly on kernel-3.10.0-820.el7. so will moved to "VERIFIED"
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHSA-2018:1062