Red Hat Bugzilla – Bug 252235
megaraid_sas: Failed to alloc kernel SGL buffer for IOCTL
Last modified: 2013-01-18 09:51:21 EST
Description of problem:
Have several PowerEdge 2950 running kernel 2.6.9-42.0.2.ELsmp. I'm using the
builtin PERC 5/i Raid controller. All are spitting logging this error:
megasas: Failed to alloc kernel SGL buffer for IOCTL
Version-Release number of selected component (if applicable):
Not sure how to manually reproduce it. The error does show up daily during
regular use (apache+tomcat).
firstname.lastname@example.org, could you send us a system log showing the failure?
Created attachment 194971 [details]
messages from a box running 2.6.9-42.0.10
Created attachment 194991 [details]
messages from a box running 2.6.9-52.0.2 kernel
The system is no longer running 2.6.9-42.0.2 kernel. It was updated and is now
using 42.0.10. I've attached 2 logs. First is 2.6.9-42.0.10.log, this dell
poweredge 2950 w/ rhel4u4. Second is 2.6.9-52.0.2.log, this is a 1950 w/ rhel4u5
w/ all the updates minus the latest kernel of 52.0.6. Both are running kernel-smp.
Also refer to BZ 247767.
Kernel: 2.6.9-42.ELsmp #1 SMP Wed Jul 12 23:32:02 EDT 2006 x86_64 x86_64 x86_64 GNU/Linux
As I mentioned above in comment #5, this may be the same problem that was reported in BZ 247767 "megaraid_sas ioctls fail under load".
That bug was confirmed to be fixed by the driver update in Bug 312061 "Update megaraid_sas to version 3.18-rh1". That driver update went in to RHEL 4.7.
Has the reporter of this BZ been able to determine whether the problem reported here is solved by driver version 3.18-rh1 or later?
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