Re: SCSI hotplug issues with UEFI VM with guest kernel >= 6.5

[Igor Mammedov]

On Tue, 12 Dec 2023 13:50:20 +0100
Fiona Ebner <f.ebner@xxxxxxxxxxx> wrote:

> Am 12.12.23 um 12:26 schrieb Igor Mammedov:
> > 
> > it's not necessary, but it would help to find out what's going wrong faster.
> > Otherwise we would need to fallback to debugging over email.
> > Are you willing to help with testing/providing debug logs to track down
> > the cause?.
> >   
> 
> I submitted the dmesg logs in bugzilla:
> https://bugzilla.kernel.org/show_bug.cgi?id=218255
> 
> > Though debug over email would be slow, so our best option is to revert
> > offending patches until the cause if found/fixed.
> >   
> >>>>> Do you have to revert both cc22522fd55e2 and 40613da52b13f to make it
> >>>>> work reliably?  If we have to revert something, reverting one would be
> >>>>> better than reverting both.      
> >>>>    
> >>
> >> Just reverting cc22522fd55e2 is not enough (and cc22522fd55e2 fixes
> >> 40613da52b13f so I can't revert just 40613da52b13f).  
> > 
> > With UEFI setup, it still works for me fine with current master.
> > 
> > Kernel 6.7.0-rc5-00014-g26aff849438c on an x86_64 (ttyS0)
> >   
> 
> I also built from current master (still 26aff849438c) to verify and it's
> still broken for me.
> 
> > 
> > it still doesn't work with Fedora's 6.7.0-0.rc2.20231125git0f5cc96c367f.26.fc40.x86_64 kernel.
> > However it's necessary to have -smp 4 for it to break,
> > with -smp 1 it works fine as well.
> >   
> 
> For me it's (always with build from current master):
> 
> -smp 1 -> it worked 5 times out of 5
> -smp 2 -> it worked 3 times out of 5
> -smp 4 -> it worked 0 times out of 5
> -smp 8 -> it worked 0 times out of 5


I managed to reproduce it with upstream using fedora 40 config as is
(without converting it to mod2yesconfig).
So give me a couple of days to debug it before reverting.

> 
> Best Regards,
> Fiona
>