[dm-devel] [PATCH 0/6] libmultipath: check udev* func return value

[Martin Wilck]

On Fri, 2020-09-18 at 16:39 +0800, lixiaokeng wrote:
> 
>    Here we use multipath-tools basing on iscsi. When iscsi logout,
> the path
> will disappear in sysfs and a uevent will cause. Before uevent
> processed,
> some coredump will happen but if coredump is solved the multipathd
> will
> deal with the disappeared path latter.
>   In this set, the funcs will not be processed when multipath-tools
> bases
> on iscsi. However, I think multipathd will deal with the disappeared
> path
> like basing on iscsi. So I just check them. Anyway, if you have any
> better
> idea, please tell me.

Of course we need to avoid the segfaults. As I said, please fix your
patches and resend. It's good to know that just avoiding the NULL
dereferences fixes the issues you were seeing.

Perhaps it would be sufficient to set INIT_REMOVED on a path device
when something like this happens. But I need to think it through.

Martin