Hi Jiri,
You are right, I tested the latest kernel, did not see this bug.
So I will only submit this patch to Redhat.
Thanks
Zhenhua
On 07/15/2014 05:16 PM, Jiri Slaby wrote:
Hi,
On 07/15/2014 11:08 AM, Li, ZhenHua wrote:
This bug was founded in RHEL 6, kernel version 2.6.32.
But I also checked the file tty_io.c in latest kernel, not all the code
protected by tty_lock(tty).
For example, in function tty_del_file,
if (--tty->count < 0) {
}
and
tty_del_file(filp);
are not surrounded by tty_lock(tty).
Sure, but there is tty_lock_pair instead.
So I think the new lock is necessary.
Nope, sorry, you have to complain to RedHat about this kernel. Unless
you can reproduce this with the vanilla kernel.
thanks,
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