dhcpcd-discuss

Hi Lukas

On 11/04/2018 16:28, Lukas Wunner wrote:
> when resetting a USB-attached Ethernet interface using the USBDEVFS_RESET
> ioctl(), the interface briefly disappears, then reappears.  This results
> in add and remove uevents from both the kernel and udevd.
>
> If those uevents are interleaved as
>     kernel remove
>     kernel add
>     udevd remove
>     udevd add
> then dhcpcd fails to assign addresses on reappearance of the interface.
>
> If on the other hand the uevents are ordered as
>     kernel remove
>     udevd remove
>     kernel add
>     udevd add
> then everything works as expected.
>
> Adding --nodev on the command line or nodev to dhcpcd.conf makes the
> issue go away.
>
> Detailed debug logs are available at
> https://github.com/RPi-Distro/repo/issues/102

Does this patch help?

diff --git a/src/if-linux.c b/src/if-linux.c
index 152cffed..efd3ec79 100644
--- a/src/if-linux.c
+++ b/src/if-linux.c
@@ -770,7 +770,10 @@ link_netlink(struct dhcpcd_ctx *ctx, struct 
interface *ifp,
        }

        if (nlm->nlmsg_type == RTM_DELLINK) {
-               dhcpcd_handleinterface(ctx, -1, ifn);
+               /* If are listening to a dev manager, let that remove
+                * the interface rather than the kernel. */
+               if (dev_listening(ctx) < 1)
+                       dhcpcd_handleinterface(ctx, -1, ifn);
                return 0;
        }


Let me know!

Roy