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Date: Tue, 31 Jan 2012 06:18:00 -0800 From: ebiederm@...ssion.com (Eric W. Biederman) To: Kay Sievers <kay.sievers@...y.org> Cc: Jiri Slaby <jslaby@...e.cz>, Greg KH <greg@...ah.com>, LKML <linux-kernel@...r.kernel.org>, ML netdev <netdev@...r.kernel.org> Subject: Re: network regression: cannot rename netdev twice Kay Sievers <kay.sievers@...y.org> writes: > On Tue, Jan 31, 2012 at 12:17, Jiri Slaby <jslaby@...e.cz> wrote: >> On 01/31/2012 12:13 PM, Kay Sievers wrote: > >>> This is a command sequence you type manually? >> >> Yea, and it is working with 3.3.0-rc1-next-20120124_64+. Not with >> 3.3.0-rc1-next-20120131_64+. >> >>> You are sure that userspace is not working in the background, >>> triggered by uevents, and comes into your way here? >> >> Note that krtek exists after the first command. But cannot be renamed >> further. > > Yeah, I can confirm the problem here. I works fine with earlier > kernels and fails with the latest -next: > > # uname -r > 3.3.0-rc1-next-20120131+ > # modprobe dummy > # ip link set dummy0 name foo0 > # ip link set foo0 name bar0 > RTNETLINK answers: No such file or directory There is something weird going on when sysfs directories and symlinks are renamed. My guess is that I fat fingered something with one of my last sysfs patches. I will look more deeply once I have slept some more. The second network device renames fails because the first rename did not work properly. ls -l /sys/class/net/ /sys/virtual/net/ will let you see what I mean. Eric -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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