LOR (re0 and user map) + PANIC
rwatson at freebsd.org
Fri Sep 10 10:15:34 PDT 2004
On Fri, 10 Sep 2004, John-Mark Gurney wrote:
> Marian Cerny wrote this message on Fri, Sep 10, 2004 at 12:22 +0200:
> > Heh, I noticed one more LOR. This one happens when I turn the laptop off
> > using 'halt -p' after syncing disks. It's *hand*-rewritten, because the
> > laptop turned itself off after 10 seconds, despite the fact, that I was
> > inside kernel debugger (I took a shot with my digital photo camera).
> > lock order reversal
> > 1st 0xc177b6e8 re0 (network driver) @ /usr/src/sys/dev/re/if_re.c:1752
> > 2nd 0xc08adee4 user map (user map) @ /usr/src/sys/vm/vm_map.c:2997
> What version of if_re.c are you running? neither RELENG_5 nor HEAD has
> a lock on line 1752.
While this would be useful to know, the actual bug (per my earlier e-mail)
is a NULL pointer deref:
> > --- trap 0xc, eip = 0xc0575b76, esp = 0xceef9cc0, ebp = 0xceef9cdc ---
> > re_rxeof(c177b000) at re_rxeof+0x2ae
It would be very useful to know the revision of the file, as well as what
line in the code re_rxeof+0x2ae is.
Robert N M Watson FreeBSD Core Team, TrustedBSD Projects
robert at fledge.watson.org Principal Research Scientist, McAfee Research
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