From owner-freebsd-current  Tue Feb  6 14:37:19 2001
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Date: Tue, 06 Feb 2001 17:36:54 -0500
From: Jim Bloom <bloom@acm.org>
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To: John Baldwin <jhb@FreeBSD.org>
Cc: current@FreeBSD.org
Subject: Re: Kernel Panic from Yesterday's CVSup
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Which kernel do you want me to try this with?  I have tried two
different kernels with two different errors.  (Both have been sent at
different times in the past couple days.)  The registers listed here
from the second kernel (with WITNESS, INVARIANTS, INVARIANT_SUPPORT,
MUTEX_DEBUG).  As such the addresses disagree (sw1b has 8 more bytes for
invariants), but the text segment was correct.

Without debug, I get the trap 9.  With debug, I get a trap 12
immediately followed by a panic with mutex shced lock recursion.

I rebuilt the kernel with out the debugging and check the state of
things.  The code is correct and the esi register had the expected
value.


Jim Bloom
bloom@acm.org

P.S.  I am hitting the same problem Robert Watson mentioned.  I don't
have room for three kernels on the machine.


John Baldwin wrote:
> 
> On 06-Feb-01 Jim Bloom wrote:
> > Here are the registers (subject to typing errors):
> >
> > cs    0xc2fb0008
> > ds     0xa000010
> > es          0x10
> > fs          0x18
> > ss          0x10
> > eax         0x12
> > ecx         0x20
> > edx   0xc00b8f00
> > ebx          0x2
> > esp   0xc2fbee1c
> > ebp   0xc2fbee28
> > esi        0x100
> > edi   0xc0290990  __set_sysctl_set_sym_sysctl__kern_fscale+0x4
> > eip   0xc0266fcc  Debugger+44
> > efl         0x56
> >
> > Jim Bloom
> > bloom@acm.org
> 
> Erm, this doesn't look good:
> 
>         movl    $GPROC0_SEL*8, %esi             /* GSEL(entry, SEL_KPL) */
>         ltr     %si
> 
> #define GPROC0_SEL      4       /* Task state process slot zero and up */
> 
> Thus, %esi should be 32 == 0x20, not 0x100. :(  I have no clue why that is
> screwed up, unless something is overwriting your code segment.  Can you panic
> it and do an x/i of sw1b+0x72?  It should look something like this:
> 
>  121:   be 20 00 00 00          mov    $0x20,%esi
>  126:   0f 00 de                ltr    %si


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