Re: Suspecting kernel timing bug in ppp or tty drivers

[Greg KH <gregkh@linuxfoundation.org>]

On Mon, Mar 10, 2014 at 01:36:36PM +0000, Mats Kärrman wrote:
> Hi Linux serial & PPP experts,
> 
> For a long time now I have been chasing a problem in my PPP connection.
> The fault scenario is as follows:
> 
> - After reboot establishing a PPP connection works OK
> - Network communication over PPP works OK
> - The PPP connection is restarted - could be for any of several reasons; peer
>   drops the connection gracefully, local restart due to network problems,
>   local restart due to user request, et.c.
> - After closing down the connection, it is not possible to re-connect again.
>   The Error messages from pppd looks something like:
> 
> Jan  1 01:04:42 mymachine local2.err chat[631]: Can't get terminal parameters: Input/output error
> Jan  1 01:04:42 mymachine daemon.debug pppd[629]: Script /usr/sbin/chat -v -f /etc/ppp/chats/gprs-conn -T my-apn (pid 630), status = 0x2
> Jan  1 01:04:42 mymachine daemon.err pppd[629]: Connect script failed
> 
> 
> Some data about the system:
> - PPP daemon v2.4.5
> - Linux kernel v3.2.51 (same error with v2.6.35 though)

That's a really old kernel version, can you try 3.13 or newer?  Lots of
work has been done in the tty layer since 3.2 was released.

thanks,

greg k-h