Hi community,

I've a strange news every two seconds, I got a message which is

<3>rc_kthread_mem_user_copy: 8

I'm running OpenSuse Tumbleweed with latest updates and Kernel
Linux lnx 5.11.6-1-default #1 SMP Thu Mar 11 16:11:36 UTC 2021 (7358b30) x86_64 x86_64 x86_64 GNU/Linux

I've no clue where to look to eliminate this message. If anyone has any hint to me where to dig in?



The first occurrence is here

[ 4.872317] scsi 1:1:0:0: Attached scsi generic sg2 type 5
[ 4.917606] sda: sda1
[ 4.917915] sd 1:0:0:0: [sda] Attached SCSI disk
[ 9.931925] sr 1:1:0:0: [sr0] scsi-1 drive
[ 9.931928] cdrom: Uniform CD-ROM driver Revision: 3.20
[ 9.960556] <3>rc_kthread_mem_user_copy: 8
[ 9.960570] sr 1:1:0:0: Attached scsi CD-ROM sr0
[ 9.960755] <3>rc_kthread_mem_user_copy: 8
[ 9.971744] <3>rc_kthread_mem_user_copy: 8

Than it is ongoing

[ 2504.648228] <3>rc_kthread_mem_user_copy: 8
[ 2506.664209] <3>rc_kthread_mem_user_copy: 8
[ 2508.680536] <3>rc_kthread_mem_user_copy: 8
[ 2510.696566] <3>rc_kthread_mem_user_copy: 8
[ 2512.712150] <3>rc_kthread_mem_user_copy: 8
[ 2514.728105] <3>rc_kthread_mem_user_copy: 8
[ 2516.744457] <3>rc_kthread_mem_user_copy: 8
[ 2518.760429] <3>rc_kthread_mem_user_copy: 8
[ 2520.776053] <3>rc_kthread_mem_user_copy: 8
[ 2522.792166] <3>rc_kthread_mem_user_copy: 8
[ 2524.808351] <3>rc_kthread_mem_user_copy: 8
[ 2526.824323] <3>rc_kthread_mem_user_copy: 8

Thanks in advance, Fred

It does not look like a standard kernel message, although kthread is a kernel feature. Do you have a non-standard module loaded? Is the kernel built with any staging drivers or experimental features?

Thank you for your message, indeed I use an the AMD-RAID controller to use two SSDs as RAID0. With each kernel update I've to recompile the module.
How and where can I figure out to avoid this message, might it be an option or is is included in the source code?

This is how it looks like:


lnx:~/raid/driver_sdk # modinfo rcraid
filename: /lib/modules/5.11.6-1-default/kernel/drivers/scsi/rcraid.ko
license: Proprietary
description: AMD-RAID controller
author: AMD, Inc.
suserelease: openSUSE Tumbleweed
srcversion: B5CE6EB619B833ADEBAC63A
alias: pci:v00001022d00007916sv*sd*bc*sc*i*
alias: pci:v00001022d000043BDsv*sd*bc*sc*i*
alias: pci:v00001022d00007905sv*sd*bc*sc*i*
depends:
retpoline: Y
name: rcraid
vermagic: 5.11.6-1-default SMP mod_unload modversions
parm: TwoTripWriteRate:min write rate (kb/s) to bypass cache (int)
parm: OneTripWriteRate:min write rate (kb/s) to bypass cache (int)
parm: WriteBypassThreshold:min write size (kb) to bypass cache (int)
parm: ActiveRaid5FlushesLimit:Active Raid5 Flushes Limit (int)
parm: ForcePhysAddr:force all memory references to use physical addresses (int)
parm: DoSmarto SMART polling (uint)
parm: SmartPollInterval:SMART poll interval in seconds (uint)
parm: debug:debug print level (int)
parm: cmd_q_depth:total command queue depth (int)
parm: tag_q_depth:individual tagged command queue depth (int)
parm: max_xfer:max sectors per transfer (int)
parm: use_swl:Specify SWL chipsets (int)
parm: rc_adapter_count:Specify number of spanned adapters (int)
parm: rc_suspend_delay:suspend delay (int)

I avoid motherboard RAID because of the low performance, incompatibility with tools like smartctl, and loss of data if the motherboard fails. md or dm is preferable.

The message doesn't look like an error. Maybe logging is set too high. Try

cat /proc/sys/kernel/printk