Date: Sun, 25 Feb 1996 01:46:47 +1100 From: Bruce Evans <bde@zeta.org.au> To: freebsd-hackers@FreeBSD.ORG, j@uriah.heep.sax.de Subject: Re: Whither ddb Message-ID: <199602241446.BAA07462@godzilla.zeta.org.au>
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>Debugger("serial console break")
>Stopped at _Debugger+0x2b: movb $0,_in_Debugger.110
>db> x curproc
>_curproc: f0434200
>db> c
>clearing /tmp
>recording kernel -c changes
>starting system daemons: syslogd.
>starting network daemons: named portmap inetd.
>load: 0.76 cmd: dev_mkdb 76 [biowait] 0.16u 0.16s 0% 420k
>standard daemons: cron printer sendmail.
>setting ldconfig path: /usr/lib /usr/X11R6/lib /usr/local/lib
>Debugger("
>Fatal trap 9: general protection fault while in kernel mode
>instruction pointer = 0x8:0xf0102ce5
>code segment = base 0x0, limit 0xfffff, type 0x1b
> = DPL 0, pres 1, def32 1, gran 1
>processor eflags = resume, IOPL = 0
>current process = 93 (ldconfig)
>interrupt mask =
>kernel: type 9 trap, code=0
>Stopped at _db_printf_guts+0x335: repne scasb (%esi)
>*** arrgh. what you see here looks like a kernel bug :-(( ***
>Does anybody know offhand why dp_printf_guts() might cause a general
>protection fault? (#GP -- sounds like winglows, eh! :)
Probably a bad pointer. Entering ddb with the serial console break
is apparently unsafe. ddb needs to run with interrupts disabled since
its caller needs them disabled , but this isn't guaranteed.
Bruce
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