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    SubjectRe: [patch] "big IRQ lock" removal, 2.5.27-A1

    On Sun, 21 Jul 2002, Russell King wrote:

    > > (gdb) list *0xc01b1f03
    > > 0xc01b1f03 is in serial_in (serial_8250.c:189).
    > > 184 return readb(up->port.membase + offset);
    > > 185
    > > 186 default:
    > > 187 return inb(up->port.iobase + offset);
    > > 188 }
    > > 189 }
    > > 190
    > > 191 static _INLINE_ void
    > > 192 serial_out(struct uart_8250_port *up, int offset, int value)
    > > 193 {
    > > (gdb)
    >
    > Interesting. Not had a report of that thus far. Can you send me any
    > kernel messages relating to serial devices please, and the bad address
    > that caused the oops? (line 189 is obviously a lie...)

    i believe it was the inb's dereference.

    i dont have the oops around anymore, since serial logging is not working
    ;-) Had to write it down from screen.

    > > when echo-ing into a serial port, which is also set up for kernel serial
    > > console. (the kernel serial console produces no output.)
    >
    > Weird. Currently I've no idea what's causing this; I've been booting
    > machines with "console=ttyS0,115200n8" fine here with no noticable
    > problems.
    >
    > Again, any useful kernel messages?

    will reproduce and write down the full oops - it was an illegal
    dereference on 0xfffffff8 (-8 offset of a NULL pointer) or something like
    that.

    my serial setup is:

    append="console=ttyS1,115200 console=tty0"

    old serial driver:

    Serial driver version 5.05c (2001-07-08) with MANY_PORTS SHARE_IRQ
    SERIAL_PCI enabled
    ttyS00 at 0x03f8 (irq = 4) is a 16550A
    ttyS01 at 0x02f8 (irq = 3) is a 16550A

    i'm pretty sure it hung when i echoed to ttyS1 - not 100% sure though.

    Ingo

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