Bug 197805

Summary: 4.14.0-rc8 - Oops - EIP: __blk_rq_unmap_user - unable to handle kernel paging request
Product: IO/Storage Reporter: alertesmails
Component: Serial ATAAssignee: Tejun Heo (tj)
Status: NEW ---    
Severity: normal    
Priority: P1    
Hardware: All   
OS: Linux   
Kernel Version: 4.14.0-rc8 Tree: Mainline
Regression: No
Attachments: lspci
syslog trace

Description alertesmails 2017-11-07 18:35:41 UTC
Created attachment 260541 [details]
lspci

cpu : Skylake i3 6100H
Distribution : slackware 14.2 32 bits

I attach :
- lspci
- syslog trace
Comment 1 alertesmails 2017-11-07 18:37:08 UTC
Created attachment 260543 [details]
syslog trace
Comment 2 alertesmails 2017-11-30 20:20:42 UTC
Idem with all next kernels. And now with 4.14.3.

The problem occurs often when I do "lilo -v" after compiling a kernel.

Maybe important :a script does the following at start (powertop advice) :
echo "sata power management"
echo 'min_power' > '/sys/class/scsi_host/host0/link_power_management_policy';
echo 'min_power' > '/sys/class/scsi_host/host1/link_power_management_policy';
echo 'min_power' > '/sys/class/scsi_host/host2/link_power_management_policy';
echo 'min_power' > '/sys/class/scsi_host/host3/link_power_management_policy';
Comment 3 alertesmails 2017-12-07 07:40:16 UTC
Idem on 4.14.4

It is always the same address 6b6b6b7b. 
 BUG: unable to handle kernel paging request at 6b6b6b7b
Comment 4 alertesmails 2017-12-30 10:49:32 UTC
surprising to still see this so old and reproducible bug...

It occurs again when doing lilo -v after compiling 4.14.10