Re: Fatal trap 12 in kernload()

On Fri, Feb 25, 2005 at 04:47:14PM -0800, Doug White wrote:
> On Thu, 24 Feb 2005, Kris Kennaway wrote:
> 
> > > fault virtual address   = 0x7562676b
> 
> I agree with Dan, this is bogus. kernload() is the offset from kernbase
> where the ELF headers get stuck. I suspect ddb is resolving it like it
> resolves end -- its beyond the beginning of the kernel so it picks the
> next best match, like end shows up beyond the end of the symbol table.
> (FYI end usually indicates calls into a KLD.)
> 
> > > current process         = 52613 (getty)
> > > Tracing pid 52613 tid 100360 td 0xd2d3a000
> > > kernload(cd533500,3,2000,d2d3a000,3) at 0x7562676b
> > > devfs_open(f8225a4c,c072025a,1e6,c07205ff,d235f134) at devfs_open+0x291
> 
> Can you get an addr2line on this devfs_open call?  It appears to have
> tried to open an incompletely initialized tty device.  Which one would be
> nice to know :-)

It was ttyd0.  phk couldn't figure out how this happened, so I'm
trying to recreate it.

Kris

> > > VOP_OPEN_APV(c07340a0,f8225a4c,3,c076d398,1) at VOP_OPEN_APV+0x9e
> > > vn_open_cred(f8225bbc,f8225cbc,860,cd33e180,1) at vn_open_cred+0x45b
> > > vn_open(f8225bbc,f8225cbc,860,1,d2d3a000) at vn_open+0x33
> > > kern_open(d2d3a000,804f860,0,3,804f860) at kern_open+0xca
> > > open(d2d3a000,f8225d14,3a6,c071c691,d2d3a000) at open+0x36
> > > syscall(2f,2f,2f,2,804f860) at syscall+0x2c4
> > > Xint0x80_syscall() at Xint0x80_syscall+0x1f
> > > --- syscall (5, FreeBSD ELF32, open), eip = 0x280ca2cb, esp = 0xbfbfedfc, ebp = 0xbfbfee28 ---
> > > db>
> >
> > Kris
> >
> 
> -- 
> Doug White                    |  FreeBSD: The Power to Serve
> dwhite_at_gumbysoft.com          |  www.FreeBSD.org
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