Re: [REGRESSION v4.3] scsi_dh: use-after-free when removing scsi device

[Christoph Hellwig <hch@lst.de>]

On Thu, Oct 01, 2015 at 11:40:23AM +0000, Junichi Nomura wrote:
> On 10/01/15 14:21, Christoph Hellwig wrote:
> > Any chance you could share all your multipath tests in a git repository
> > somewhere?  It seems like you're the only one actually having a good
> > set of reproducable but minimalistic tests.
> 
> Hmm, sorry I don't have a public git repository...
> 
> I'm using a pair of KVM guest, one for iSCSI target and the other
> for testing.

Any chance you could share your various scripts in some way to that
people doing multipath changes can run them to verify those changes?

> 
> I could reproduce the crash using this loop, within a few minutes:
> 
>    service multipathd start
>    while true; do
>      multipath -F
>      iscsiadm -m node --logout
>      iscsiadm -m node --login
>    done
> 
> It might implicitly depend on udev to do some small amount of I/O
> after device uevent though.

I can't reproduce this unfortunately.  I suspect udev doesn't do enough
stupid things on my old Debian test system.