On Wed, Sep 25, 2013 at 08:13:04PM -0400, Peter Hurley wrote:
> Commit 'e7f3880cd9b98c5bf9391ae7acdec82b75403776'
>   tty: Fix recursive deadlock in tty_perform_flush()
> introduced a regression where tcflush() does not generate
> SIGTTOU for background process groups.
> 
> Make sure ioctl(TCFLSH) calls tty_check_change() when
> invoked from the line discipline.
> 
> Cc: [email protected] # v3.10+
> Reported-by: Oleg Nesterov <[email protected]>
> Signed-off-by: Peter Hurley <[email protected]>
> ---
>  drivers/tty/tty_ioctl.c | 3 +++
>  1 file changed, 3 insertions(+)

Thanks for tracking this down, I'll queue it up tomorrow.

greg k-h
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