Re: Success: tty_io flush_to_ldisc() error message triggered

[Paul Fulghum <paulkf@microgate.com>]

Chuck Ebbert wrote:
> Using the patch below that you sent me, this message printed today on
> my SMP system when terminating pppd:
>
>         flush_to_ldisc - TTY_FLUSHING set, low_latency=0
>
> And this bug is also in 2.6.17.4 - I forgot to reboot into 2.6.16.x
> and the system locked up the same way 2.6.16 used to.  That was made
> even more fun by the 'SysRq broken on SMP' bug fixed by a pending
> 2.6.17.7 patch...

That confirms my thoughts on what went wrong:
multiple copies of the queued work (flush_to_ldisc)
running in parallel and corrupting the free buffer list.

A cleaner fix for this is already
in the 2.6.18 rc series.

Thanks,
Paul

--
Paul Fulghum
Microgate Systems, Ltd.



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