** Tags added: verification-needed
** Tags added: tpp
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Title:
IO's are issued with incorrect Scatter Gather Buffer
To manage notifications abou
** Description changed:
-
+ [Impact]
We have observed that OS is sending the IO's (SCSI Read/Write) with incorrect
Scatter Gather Buffer address .
i.e
- OS is sending the IO with 64 bit Scatter Gather Buffer address , such
+ OS is sending the IO with 64 bit Scatter Gather Buffer addr
How to Recreate
1. Install Ubuntu 18.04.01 on a separate storage disk.
2. Create VDs on H840/H740 using 9 physical disks
a. 16 sliced RAID5; 10 GB each
b. 16 sliced RAID1; 10 GB each
c. 16 sliced RAID6; 10 GB each
3. Install JAVA
4. Download and copy vdbench to system
a.
Broadcom submitted the fix upstream:
https://marc.info/?l=linux-scsi&m=154514161019901&w=2
https://marc.info/?l=linux-scsi&m=154514161319908&w=2
https://marc.info/?l=linux-scsi&m=154514161619911&w=2
and the commit IDs of these patches from upstream:
894169db1246 scsi: megaraid_sas: Use 63-bit DMA
63 bit masking will cause double buffering of data ?
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Title:
IO's are issued with incorrect Scatter Gather Buffer
To manage notifications about
The 63bit dma_mask was just a test to understand the adress-wraparound by the
fw. Nothing specific.
PERC didn't go offline. Always ended up with OOM btw.
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Just would like to understand more about the system behavior when we
change the DMA Mask from 64 bit to 63 bit
do we expect any double buffering ?
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@sasikumarpc -
We observed this scenario where the PERC goes offline:
sgl_ptr->Address = f000
sgl_ptr->Length = 1000
We do not see a roll-over here..
Kernel is indicating to read 0x1000 bytes starting from address
0xf000 i.e till 0x which very well aligns
w
Yes , It seems that bug is still not fixed
FYI - We also observed page fault in 4.18 kernel
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Title:
IO's are issued with incorrect Scatter Gathe
I see the disks going offline during stress in mainline
4.19.0-041900rc7-generic as well.
Although the symptoms look different in 4.15 and 4.18 kernels, I feel
the bug is not fixed; address being accessed is still out-of-range in
this 16GB server.
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With the 4.18.0-8-generic kernel, I see AMD IOMMU IO_PAGE_FAULTs for invalid
addresses
AMD-Vi: Event logged [IO_PAGE_FAULT device=e1:00.0 domain=0x
address=0xfffd14c0 flags=0x0030]
PERC controller is still present btw, but the vdbench stress crashed due
to this page faults.
** Attac
With latest 4.15 LTS kernels, I see the vdbench process crash and the
PERC controller and the related disks go offline..
** Attachment added: "4.15 - vdbench - disks go offline"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1795453/+attachment/5204195/+files/4.15-stress_fails.txt
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Y
Yes below 4.18 kernel (which is 4.15) fixes only with increased memory
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Title:
IO's are issued with incorrect Scatter Gather Buffer
To manage no
@sasikumarpc - Ok. So when you say below v4.18 kernel fixes it, does it
mean with increased memory or is it with the same setup where the issue
was originally seen?
Issue resolved Kernel Version
-
4.18.0-8-generic
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> Also another version (other than default version of Ubuntu 18.04.01)
of 4.15 kernel fixes the issue
Can you share this kernel version as well?
Actually adding additional memory to the system which has
4.15.0-34-generic kernel fixes the issue , not the different version of
4.15 kernel fixes the
> Also another version (other than default version of Ubuntu 18.04.01)
of 4.15 kernel fixes the issue
Can you share this kernel version as well?
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apport information
** Tags added: apport-collected uec-images
** Description changed:
We have observed that OS is sending the IO's (SCSI Read/Write) with incorrect
Scatter Gather Buffer address .
i.e
OS is sending the IO with 64 bit Scatter Gather Buffer address , such
that if
Issue reported Kernel Version
-
4.15.0-34-generic
Issue resolved Kernel Version
-
4.18.0-8-generic
Linux user 4.18.0-8-generic #9~18.04.1-Ubuntu SMP Mon Sep 17
12:49:27 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
It looks lik
sasikumarpc -
Can you share the specific kernel versions that you are using, where the issue
is fixed?
Can you also share the logs of pass & failure cases?
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It will be good if you could provide us the exact commit (Patch) which
fixes the issue
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Title:
IO's are issued with incorrect Scatter Gather Buff
Also another version (other than default version of Ubuntu 18.04.01) of
4.15 kernel fixes the issue
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Title:
IO's are issued with incorrect Scatte
Could you also test the latest upstream 4.15 stable kernel? It is available
from:
http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.15.18/
We should be able to perform a reverse bisect to identify the commits in
4.18 that resolve this bug.
** Changed in: linux (Ubuntu)
Importance: Undecided
Looks like the issue is not seen with 4.18 kernel , please let me know
still Ubuntu requires the log with 4.15 kernel ?
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Title:
IO's are issued w
we are in the process of collecting logs
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Title:
IO's are issued with incorrect Scatter Gather Buffer
To manage notifications about this bug go
Can any of you recreate this using the mainline kernel?
https://wiki.ubuntu.com/Kernel/MainlineBuilds
that should at least give a point in time where we know either it's not
fixed in 4.18 or it IS fixed in 4.18 and the patches would be easier to
derive.
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moving to kernel itself rather than the hwe package
** Package changed: linux-signed-hwe (Ubuntu) => linux (Ubuntu)
** Changed in: linux (Ubuntu)
Status: Confirmed => New
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https:/
No, we own only the mega raid Linux driver , you may have to reach out
to AMD iommu driver team
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Title:
IO's are issued with incorrect Scatter Ga
@mreed8855 This issue may be related to the amd_iommu driver. There are
patches upstream that are not in the 4.15 kernel. How can we get a list
of those patches. Is there an amd_iommu expert out there?
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Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: linux-signed-hwe (Ubuntu)
Status: New => Confirmed
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Ti
uname -r:
4.15.0-34-generic
Driver Version :
MEGASAS_VERSION "07.703.05.00"
How to recreate the issue :
run IO's (SCSI R/W) using vdbench tool on raw Virtual Disks (which is on
the Broadcom (LSI) Megaraid H840 controller)
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Can you provide more information, such as the driver version, uname -a,
logs, and how to recreate the issue?
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Title:
IO's are issued with incorre
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