Re: 2.4.9-bk and X on 6500, not so good

At 10:15 AM +0200 8/21/01, Benjamin Herrenschmidt wrote:

 >I have a stock 6500/300, on which I just compiled and installed the

quoted

ppc.bitkeeper linuxppc_2_4 (2.4.9) kernel. In console mode (RL3) it
works just fine.

But whenever I launch X (Gnome for example, or a plain window
manager), about 70% of the time it breaks into the mon debugger
before X has fully launched.

Problem is, there is no keyboard response at this point, and I can't
even restart with the 3-fingered approach (no response). Only thing
that works is power down, and restart.

Any suggestions? To create a backtrace appears impossible...

You can at least get the PC and LR values displayed by xmon and
lookup them in your System.map.

pc = C0182544
lr = C0182444

from System.map:

c01821ec t unix_stream_data_wait
c01822dc t unix_stream_recvmsg
c018279c t unix_shutdown

 Eventually, you can hack xmon
entry point to do a backtrace automatically.

I was looking at xmon.c to do this, but I'm afraid I'm unclear on
where to try to make this happen at the break. I tried naively to
place the backtrace(excp) command right after the mon> printf
statement, but this didn't work when the crash happened.


Stefan Jeglinski

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