[PATCH] Linux-0.99.4 (January 20, 1993)

[PATCH] Linux-0.99.4 (January 20, 1993)

net-1: random addition of "volatile" keywords to try to hide race
conditions in the code.

File locking updated with shared and exclusive locks for BSD flock.

Re-mounting of filesystems and new mount system call.

Re: Freeze up on X

In article <1993Jan21.181502.23485@miles.com> dennisf@miles.com (Dennis Flaherty) writes:
>
>Here's another clue.  Try this: when your system freezes, running X, try
>MOVING THE MOUSE.  It's weird!!  But moving the mouse actually makes the
>system run!  Stop moving the mouse, and the system freezes again.  And
>this only happens with 0.99.3, not 0.99.2.

Get pl4, and it should be gone.  There was a bug in the handling of
uninitialized interrupts in pl3, where they could result in either the
wrong interrupt mask being loaded leading to interrupt lock-out or (in
some cases) bit corruption at the user level.  The symptoms are exactly
as you describe: a good interrupt that didn't happen to be locked out
will correct the interrupt mask, and the system goes on (it can be
moving the mouse, but it might also be a keyboard event etc).

            Linus