I'm getting spectacular machine lockups when doing bulk data downloads
of bigger files through my PPP connection. The machine crashes with
interrupts off and overwrites the VGA screen memory. I see many colors
on the screen then and between then traces of what looks like a very
mangled oops or kernel panic (unreadable). The crash is perfectly
reproducible here (just need downloading a >200K file through PPP)
and the pattern showed on the screen is always identically (I had this
crash at least 5-6 times now and it looked like it always wrote the
same value to the screen buffer). After the lockup only the reset
button helps, all interrupts seem to be off.
The last kernel I tried before 2.1.50/51 was 2.1.42 (that one didn't
crash), the bug must have been introduced between them. 2.1.50 crashed too.
Here is my configuration:
P90, 64MB RAM, PCI Triton1 board, Matrox Millenium (most of the time
X wasn't running, but it crashed in X11 too), Modem speed 57600 with an
28.8k modem.
Serial driver version 4.24 with no serial options enabled
ttyS00 at 0x03f8 (irq = 4) is a 16550A
ttyS01 at 0x02f8 (irq = 3) is a 16550A
CONFIG_SERIAL=y
# CONFIG_SERIAL_EXTENDED is not set
# CONFIG_SERIAL_NONSTANDARD is not set
Please tell me if you need more information or special testing.
-Andi