Comment # 42 on bug 1173860 from Takashi Iwai

(In reply to Martin Tessun from comment #41)
> (In reply to Takashi Iwai from comment #38)
> > (In reply to Takashi Iwai from comment #37)
> > > I'll respin the patch and rebuild a kernel...
> > 
> > Yet another test kernel is being built in OBS home:tiwai:bsc1173860-3 repo,
> > will appear later at:
> >  
> > http://download.opensuse.org/repositories/home:/tiwai:/bsc1173860-3/standard/
> > 
> > Fingers crossed.
> 
> This one works:
> 
> localhost:~ # lvcreate -m 1 -n m_vol -l 10 system
>   Logical volume "m_vol" created.
> localhost:~ # uname -a
> Linux localhost 5.3.18-1.g119f164-default #1 SMP Thu Jul 9 15:22:58 UTC 2020
> (119f164) x86_64 x86_64 x86_64 GNU/Linux
> localhost:~ #
> 
> NO crash. Looks like you found the issue.

Thanks.  So it seems to be the NULL mddev->gendisk, indeed.
FYI, Jeff, my fix branch is found in users/tiwai/SLE15-SP2/md-fix.