Date: Tue, 18 May 1999 18:11:19 +0900 From: Hidetoshi Shimokawa <simokawa@sat.t.u-tokyo.ac.jp> To: dfr@nlsystems.com Cc: jdp@polstra.com, alpha@freebsd.org Subject: Re: Panic: warning: pmap_changebit didn't. Message-ID: <14145.11959.719375.15587A@ett.sat.t.u-tokyo.ac.jp> In-Reply-To: In your message of "Tue, 18 May 1999 09:30:14 %2B0100 (BST)" <Pine.BSF.4.05.9905180929080.509-100000@herring.nlsystems.com> References: <14144.54192.153726.48298X@ett.sat.t.u-tokyo.ac.jp> <Pine.BSF.4.05.9905180929080.509-100000@herring.nlsystems.com>
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At Tue, 18 May 1999 09:30:14 +0100 (BST),
Doug Rabson <dfr@nlsystems.com> wrote:
>
> On Tue, 18 May 1999, Hidetoshi Shimokawa wrote:
>
> > I get same panic now (current of yesterday).
> >
> > panic: warning: pmap_changebit didn't.
> > panic
> > Stopped at Debugger+0x2c: ldq ra,0(sp) <0xfffffe000ce0bbe0>
> > <ra=0xfffffc0000485800,sp=0xfffffe000ce0bbe0>
> > db> trace
> > Debugger() at Debugger+0x2c
> > panic() at panic+0xfc
> > pmap_emulate_reference() at pmap_emulate_reference+0x120
> > trap() at trap+0x2b0
> > XentMM() at XentMM+0x20
> > swapout_procs() at swapout_procs+0x174
> > (null)() at 0
> >
> > I can generate crash dump, but it must be more than 500MB.
> > I'll leave it in DDB for while. If you have something to examine,
> > let me know.
>
> It would be useful to find out the values of pa, *pte and faultoff.
>
Unfortunately I cannot use gdb now.
db> gdb
No gdb port enabled. Set flag 0x80 on desired port
in your configuration file (currently sio only).
Last time, I was able to use gdb with the flag 0x50.
I found the following code in /sys/isa/sio.c
#ifdef __i386__
#if DDB > 0
gdbdev = makedev(CDEV_MAJOR, unit);
gdb_getc = siocngetc;
gdb_putc = siocnputc;
#endif
#endif
Can I use gdb on alpha with flag 0x80?
I give up to use gdb via serial and get the crash dump.
But stock gdb seems not to understand crash dump yet.
root@achat:/export/home/crash# gdb kernel.debug.13 vmcore.13
GNU gdb 4.18
Copyright 1998 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for details.
This GDB was configured as "alpha-unknown-freebsd"...
"/export/home/crash/vmcore.13" is not a core dump: File format not recognized
(gdb)
--
/\ Hidetoshi Shimokawa
\/ simokawa@sat.t.u-tokyo.ac.jp
PGP public key: finger -l simokawa@sat.t.u-tokyo.ac.jp
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