Bug 4792 - 2.2.x kernel panics when using serial console
Summary: 2.2.x kernel panics when using serial console
Alias: None
Product: Red Hat Linux
Classification: Retired
Component: kernel
Version: 5.2
Hardware: sparc
OS: Linux
Target Milestone: ---
Assignee: David Lawrence
QA Contact:
Depends On:
TreeView+ depends on / blocked
Reported: 1999-08-31 00:31 UTC by kirk
Modified: 2008-05-01 15:37 UTC (History)
1 user (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2000-02-05 19:56:51 UTC

Attachments (Terms of Use)

Description kirk 1999-08-31 00:31:11 UTC
Sparc 20 with 2 60Mhz Sparc processors running Red Hat Linux
5.2.  I've put the packages Red Hat recommends for running a
2.2 kernel on Red Hat Linux 5.2.  I'm running the machine
headless, and when I boot the kernel (anything from 2.2.5 to
2.2.12) I get this on the console:

zs_open cua0, tty overwrite.
zs_open cua0, tty overwrite.
zs_open cua0, tty overwrite.
zs_open cua0, tty overwrite.
zs_open cua0, tty overwrite.
[ ... This will go on forever ... ]

The machine at this point seems to be running nicely if I
telnet in, but if I press a key on the serial console, the
kernel panics like so:

Unable to handle kernel NULL pointer
dereference<1>tsk->mm->context =
                  00000001 tsk->mm->pgd = f2e35000
                                \|/ ____ \|/
                                "@'/ ,. \`@"
                                /_| \__/ |_\
ifup(125): Oops
PSR: 00900fc1 PC: f0141e24 NPC: f0141e28 Y: 10e69800
g0: f0041d64 g1: 00400fe3 g2: 00000021 g3: 00000021 g4:
e00e1040 g5:
00000000 g6
: ff00e000 g7: 00000000
o0: 00000001 o1: 00000003 o2: f2f18130 o3: e00e1050 o4:
00000000 o5:
00000002 sp
: ff00fc70 o7: f0141dd8
l0: 0000000d l1: f2f18000 l2: f018fde0 l3: f018fc00 l4:
00000001 l5:
f017f800 l6

I have tried replacing the inittab entry from referencing
cua0 to ttyS0, and also (out of sheer desparation) replacing
the call to getty with mgetty, all to no avail.

I should point out that I have no problems running headless
with a 2.0.35 kernel.

Comment 1 Bill Nottingham 1999-11-04 22:41:59 UTC
Try changing /dev/console from major number 4, minor 0
to major 5, minor 1.

Comment 2 Bill Nottingham 2000-02-05 19:56:59 UTC
cloesd, lack of input.

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